2024年3月17日发(作者：卓海昌)

Designation:A90/A90M

−

13

StandardTestMethodfor

Weight[Mass]ofCoatingonIronandSteelArticleswith

ZincorZinc-AlloyCoatings

1

ThisstandardisissuedunderthefixeddesignationA90/A90M;thenumberimmediatelyfollowingthedesignationindicatestheyear

oforiginaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.

Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.

ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.

*

1.1Thistestmethodcoversproceduresfordeterminingthe

weight[mass]ofcoatingonironorsteelsheet,wire,andother

articlesinwhichthecoatingiszincorazincalloy,suchas

zinc-5%aluminum(includingzinc-5%aluminum-

mischmetalandzinc-5%aluminum-0.1%magnesium),zinc-

aluminum-magnesium(includingzinc-5to9%aluminum-

magnesiumandzinc-9to13%aluminum-magnesium)or55%

odyofthistestmethod,referenceto

zinccoatingshallbeinterpretedtoalsoincludezincalloy

coatingexceptwherespecificallystatedotherwise.

1.2Thefinalresultsdeterminedbythistestmethodshallbe

expressedininch-poundunitsorSIunits,dependingonthe

unitsusedinthematerialspecificationtowhichtheresultsare

nportionsoftheprocedureinvolving

determinationofspecimenweight[mass]havetraditionally

beenperformedinSIunits,andcorrespondinginch-pound

unitsarenotincluded.

1.3Forsheetproducts,thefinalresultsareexpressedas

eithercoatingweight[mass]totalbothsides,orcoatingweight

[mass]separatelyoneachside,dependingonthespecified

requirements.

1.4Thisstandarddoesnotpurporttoaddressallofthe

safetyconcerns,ifany,e

responsibilityoftheuserofthisstandardtoestablishappro-

priatesafetyandhealthpracticesanddeterminetheapplica-

cifichazards

statementssee

5.1.

ncedDocuments

2.1ASTMStandards:

2

A653/A653MSpecificationforSteelSheet,Zinc-Coated

(Galvanized)orZinc-IronAlloy-Coated(Galvannealed)

bytheHot-DipProcess

A792/A792MSpecificationforSteelSheet,55%

Aluminum-ZincAlloy-CoatedbytheHot-DipProcess

A875/A875MSpecificationforSteelSheet,Zinc-5%Alu-

minumAlloy-CoatedbytheHot-DipProcess

A1046/A1046MSpecificationforSteelSheet,Zinc-

Aluminum-MagnesiumAlloy-CoatedbytheHot-DipPro-

cess

A1057/A1057MSpecificationforSteel,StructuralTubing,

ColdFormed,Welded,Carbon,Zinc-Coated(Galvanized)

bytheHot-DipProcess

A1063/A1063MSpecificationforSteelSheet,Twin-Roll

Cast,Zinc-Coated(Galvanized)bytheHot-DipProcess

A1079SpecificationforSteelSheet,ComplexPhase(CP),

DualPhase(DP)andTransformationInducedPlasticity

(TRIP),Zinc-Coated(Galvanized)orZinc-IronAlloy-

Coated(Galvannealed)bytheHot-DipProcess

D1193SpecificationforReagentWater

E29PracticeforUsingSignificantDigitsinTestDatato

DetermineConformancewithSpecifications

ficanceandUse

3.1Thistestmethodprovidesastandardmethodfordeter-

miningtheweight[mass]ofcoatingforcomparisonwith

specifingofzinconironorsteel

rotection

isprovidedbysacrificiallossofzinc,thedegreeofprotection

isproportionaltotheweight[mass]fi-

cationsforzinc-coatedarticlesfrequentlyprovidefordifferent

classesofcoatingsothatthepurchasercanselectthecoating

weight[mass]mostsuitabletohisneeds.

ThistestmethodisunderthejurisdictionofASTMCommitteeA05on

Metallic-CoatedIronandSteelProductsandisthedirectresponsibilityof

SubcommitteeA05.07onMethodsofTesting.

CurrenteditionapprovedApril1,ally

eviouseditionapprovedin2011asA90/:

10.1520/A0090_A0090M-13.

1

ForreferencedASTMstandards,visittheASTMwebsite,,or

contactASTMCustomerServiceatservice@ualBookofASTM

Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon

theASTMwebsite.

2

*ASummaryofChangessectionappearsattheendofthisstandard

Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,States

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1

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A90/A90M−13

A1046/A1046M,A1057/A1057M,A1063/A1063M,orA1079

dependingonthetypeofcoating.

N

OTE

2—Forconvenienceincalculatingtestresultsininch-pound

units,thespecimenshouldhaveanareaof5.08in.

2

ofsheet(2.256

eter).Theweight[mass]of

coatingingramsonaspecimenofthatareaisnumericallyequaltothe

weight[mass]ultsto

bereportedinmetricunits,thespecimenshouldhaveanareaof3330mm

2

ofsheet(57.760.1-mmsquareor65.160.1mmindiameter).

ts

4.1PurityofReagents—Reagentgradechemicalsshallbe

otherwiseindicated,itisintendedthat

allreagentsshallconformtothespecificationsoftheCommit-

teeonAnalyticalReagentsoftheAmericanChemicalSociety,

wheresuchspecificationsareavailable.

3

Othergradesmaybe

used,provideditisfirstascertainedthatthereagentisof

sufficientlyhighpuritytopermititsusewithoutlesseningthe

accuracyofthedetermination.

4.2PurityofWater—Waterusedtopreparechemicalsolu-

tionsshallbereagentwaterasdefinedbyTypeIVof

SpecificationD1193.

4.3AntimonyTrichlorideSolution—Dissolve20gofSb

2

O

3

or32gofSbCl

3

in1000mLofHCl(spgr1.18to1.19).

4.4HydrochloricAcid(spgr1.18to1.19)—Concentrated

hydrochloricacid(HCl).

4.5HydrochloricAcid—AntimonyTrichlorideSolution—

Add5mLofantimonytrichloridesolutionto100mLofHCl

(spgr1.18to1.19).

4.6HydrochloricAcid(1+1)—Mix500mLofHCl(spgr

1.18to1.19)with500mLofreagentwaterandcooltoroom

temperature.

4.7SulfuricAcid(25+75)—Mix250mLofH

2

SO

4

(spgr

1.84)with750mLofreagentwaterandcooltoroom

temperature.

N

OTE

1—Itisadvisabletouseaninhibitorwithacidsolution(for

example,HexamethylamineTetramineorsimilar)attheconcentration

levelaccordingtothemanufacturer’srecommendationstopreventattack

ofthesubstrate.

6.2Zinc-CoatedWire—Samplesshallbesecuredasdesig-

natedintheappropriatespecificimenofwire

maybeofanylengthover12in.[305mm],butpreferably

about24in.[609mm].Whereacontinuouslengthisnot

available,shorterlengthstotalingover12in.[300mm],but

preferablyabout24in.[600mm],he

densityofthesteelisknown0.283lb/in.

3

[7830kg/m

3

],itis

notnecessarytouseaspecificlengthofspecimen.

6.3Zinc-CoatedArticlesOtherThanSheetorWire—

Samplesforweight[mass]ofcoatingdeterminationshallbe

securedasdesignatedintheappropriatespecifi

asotherwiseprovided,thespecimensshouldhaveaminimum

areaof3in.

2

(2000mm

2

)y

smallitems,severalpiecesmayhavetobestrippedtoobtain

theminimumarea.

6.3.1Inthecaseofthreadedarticles,suchasboltsand

screws,thedeterminationshallbemadeonaportionofthe

articlesthatdoesnotincludeanythread.

ure

7.1Stripthezinccoatingfromthespecimensbyusingone

ofthefollowingmethods:hydrochloricacid(1+1),hydro-

chloricacid-antimonytrichloridesolution,orsulfuricacid(25

+75).Forzincalloycoatingscontaininglessthan90%zinc,

thestrippingshallbedoneusinghydrochloricacid(1+1)or

sulfuricacid(25+75).

7.2Cleanthespecimensbywashingwithsolventnaphthaor

othersuitablesolvent,thenrinsewithalcohol,anddrythor-

oughly.

7.3Determinetheweight[mass]ofthespecimensindividu-

allytothenearest0.01g,exceptforarticlesotherthansheetor

wirewithaspecimenweight[mass]greaterthan125g,

determinetheweight[mass]

determiningtheweight[mass],immerseeachspecimensingly

inthestrippingsolutionandallowtoremainuntiltheviolent

evolutionofhydrogenhasceased,andonlyafewbubblesare

quiresabout15to30s,exceptinthe

caseofsherardizedcoatings,whichrequireasomewhatlonger

esolutionmaybeusedrepeatedlyuntilthetime

-

peratureofthestrippingsolutionshallatnotimeexceed100°F

[38°C].Afterstripping,washthespecimensbyscrubbingthem

underrunningwater,dipinhotwater,andwipeorblowdry.

Determinetheweight[mass]ofthespecimensagain,tothe

sameprecisionasintheinitialdetermination.

7.4SheetSpecimens—Whenmeasuringthetotalcoating

weight[mass]onbothsides,orthesinglesidecoatingweight

[mass]oneachside,determinetheareaofsheet(onesurface)

s

5.1Warning—Smallamountsofthepoisonousgasstibine

(SbH

3

)maybeevolvedduringthestrippingprocessusingthe

hloric

acidfumesarepresent,andhydrogengasisevolvedinthe

ore,thetestshouldbeperformed

oodis

recommendedforlargenumbersofsamplesorwherethetestis

tobecarriedoutfrequentlyoverextendedperiodsoftime.

5.2Warning—Mixingofsulfuricacidwithwatercould

mustbe

donebyslowlyaddingsulfuricacidtowaterduetotheheat

ocircumstances

ingshouldbe

performedunderanacidfumehood.

ng

6.1Zinc-CoatedSheets—Samplesforweight[mass]of

coatingdeterminationshallbesecuredinaccordancewith

Specifications

A653/A653M,A792/A792M,A875/A875M,

“ReagentChemicals,AmericanChemicalSocietySpecifications,”-

calSoc.,Washington,gestionsonthetestingofreagentsnotlistedby

theAmericanChemicalSociety,see“AnalarStandardsforLaboratoryU.K.

Chemicals,”BDHLtd.,Poole,Dorset,andthe“UnitedStatesPharmacopeia.”

3

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2

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A90/A90M−13

K=aconstant=652whenTisinin.,or=25.7whenTis

inmm.

tothenearest0.01in.

2

[5mm

2

].Ifspecimenswerepreparedto

thedimensionsasprovidedin

Note2,theyshallbepresumed

tohaveanareaof5.08in.

2

[3330mm

2

].Whenitisnotpossible

todeterminetheareaaccurately,asinspecimensfromcorru-

gatedsheets,thethicknessofthestrippedsheetshallbe

determinedtothenearest0.001in.[0.01mm].

7.4.1Whendeterminingthecoatingweight[mass]onone

sideofsheetmaterial,usetheproceduredescribedin

7.3,

exceptusea“stop-off”toprotectonesidefromthestripping

-resistantpaintsorlacquers,acid-resistanttape,

ormechanicaldevicesfastenedtothetestspecimenare

examplesofcommonlyused“stop-off”he

“stop-off”tothespecimenaftertheinitialdeterminationof

weight[mass]andremovebeforetheseconddeterminationof

weight[mass].Becauseofthepossibilityofmoistureabsorp-

tionduringthestrippingprocess,the“stop-off”mustnotbeon

thespecimenduringeitherweight[mass]determinations.

Determinethecoatingweight[mass]onthesecondside

subsequentlywithouta“stop-off”onthefirstside.

7.5WireSpecimens—Determinethediameterofthestripped

wiretothenearest0.001in.[0.01mm]bytakingtheaverage

oftwomeasurementsatrightanglestoeachother.

7.6SpecimensOtherThanSheetorWire—Determinethe

totalcoatedareaoftheoriginalspecimentothenearest0.01

in.

2

[5mm

2

].Alternatively,forspecimensofuniformthickness

ofbasemetal,suchasapieceofplateorpipe,determinethe

averagethicknessofthestrippedspecimentothenearest0.001

in.[0.01mm].

ation

8.1Zinc-CoatedSheet:

8.1.1ResultsinInch-PoundUnits:

8.1.1.1Whentheareaofonesurfaceofthesheetis

determined,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/A

#

3K(1)

8.1.2ResultsinMetricUnits:

8.1.2.1Whentheareaofsheetisdetermined,calculatethe

weight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/A

#

3K(3)

where:

C=

W

1

=

W

2

=

A=

K=

weight[mass]ofcoating,g/m

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

areaofonesurfaceofthesheet,in.

2

ormm

2

,and

aconstant=1.55×10

3

whenAisinin.

2

,or=1×10

6

whenAisinmm

2

.

N

OTE

4—Ifthespecimenwaspreparedtothedimensionsasprovidedin

Note2,havinganareaof3330mm

2

ofsheet,thefactorK/Ais

approximately300,whichmaybeusedinthecalculation.

8.1.2.2Whenitisnotpossibletoobtainaspecimenof

measurablearea,calculatetheweight[mass]ofcoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3T3K(4)

where:

C=

W

1

=

W

2

=

T=

K=

weight[mass]ofcoating,g/m

2

ofsheet

originalweight[mass]ofthespecimen,g,

weight[mass]ofthestrippedspecimen,g,

thicknessofstrippedsheet,,and

aconstant=1.99×10

5

whenTisinin.,or=7.83×

10

3

whenTisinmm.

8.2Zinc-CoatedWire:

8.2.1ResultsinInch-PoundUnits:

8.2.1.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3D3M(5)

where:

C=

W

1

=

W

2

=

A=

K=

weight[mass]ofcoating,oz/ft

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

areaofonesurfaceofthesheet,in.

2

ormm

2

,and,

aconstant=5.08whenAisinin.

2

,or=3.28×10

3

whenAisinmm

2

.

where:

C=weight[mass]ofcoating,oz/ft

2

ofstrippedwire

surface,

W

1

=originalweight[mass]ofspecimen,g,

W

2

=weight[mass]ofstrippedspecimen,g,

D=diameterofstrippedwire,,and

M=aconstant=163whenDisinin.,or=6.42whenDis

inmm.

8.2.2ResultsinMetricUnits:

8.2.2.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3D3M(6)

N

OTE

3—Ifthespecimenwaspreparedtothedimensionsasprovidedin

Note2,havinganareaof5.08in.

2

,thelossofweight[mass]ingramsis

numericallyequaltotheweight[mass]ofcoatinginouncespersquare

footofsheet.

8.1.1.2Whenitisnotpossibletosecureaspecimenof

measurablearea,calculatetheweight[mass]ofcoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3T3K(2)

where:

C=

W

1

=

W

2

=

T=

weight[mass]ofcoating,oz/ft

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedsheet,,and

where:

C=weight[mass]ofcoating,g/m

2

ofstrippedwire

surface,

W

1

=originalweight[mass]ofspecimen,g,

W

2

=weight[mass]ofstrippedspecimen,g,

D=diameterofstrippedwire,,and

M=aconstant=4.97×10

4

whenDisinin.,or=1.96×

10

3

whenDisinmm.

8.3Zinc-CoatedArticlesOtherThanSheetorWire:

8.3.1ResultsinInch-PoundUnits:

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A90/A90M−13

C5

@

~

W

1

2W

2

!

/A

#

3N(7)

8.3.1.1Calculatetheweight[mass]ofcoatingasfollows:

where:

C=

W

1

=

W

2

=

A=

N=

weight[mass]ofcoating,oz/ft

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

coatedareaoforiginalspecimen,in.

2

ormm

2

,and

aconstant=5.08whenAisinin.

2

,or=3.28×10

3

whenAisinmm

2

.

necessarilyequal,evenwhenbothsidesareexposedtothe

g

weights[masses]onallzinc-coatedarticlesotherthansheets

areexpressedinweight[mass]perunitareaofsurface.

9.2Reporttheweight[mass]ofzinccoatingtothenearest

0.01oz/ft

2

whenreportingininch-poundunits.

9.3Reporttheweight[mass]ofzinccoatingtothenearest

1g/m

2

whenreportinginmetricunits.

9.4Whentheweight[mass]ofcoatingofanumberof

specimensistobeaveragedtodetermineconformancewitha

specificationlimit,theaveragevalueshallbereportedtothe

precisiondescribedin9.2and9.3inaccordancewiththe

RoundingMethodofPractice

E29.

ionandBias

10.1Theprecisionofthistestmethodisbasedonan

tenlaborato-

riestestedthreereplicatesoftwodifferentmaterials.

4

Datawas

recordedininch-poundunitsonlyandshouldnotbeconsidered

le1forastatisticalsummaryofthe

testresults.

10.1.1Repeatability—Twotestresultsobtainedwithinone

laboratoryshallbejudgednotequivalentiftheydifferbymore

thanthe“r”valueforthatmaterial;“r”istheinterval

representingthecriticaldifferencebetweentwotestresultsfor

thesamematerial,obtainedbythesameoperatorusingthe

sameequipmentonthesamedayinthesamelaboratory.

10.1.2Reproducibility—Twotestresultsshallbejudgednot

equivalentiftheydifferbymorethanthe“R”valueforthat

material;“R”istheintervalrepresentingthedifferencebe-

tweentwotestresultsforthesamematerial,obtainedby

differentoperatorsusingdifferentequipmentindifferentlabo-

ratories.

10.1.3Anyjudgmentinaccordancewiththesetwostate-

mentswouldhaveanapproximate95%probabilityofbeing

correct.

10.2Bias—Atthetimeofthestudy,therewasnoaccepted

referencematerialsuitablefordeterminingthebiasforthistest

method,thereforenostatementonbiasisbeingmade.

10.3Theprecisionstatementwasdeterminedthroughsta-

tisticalexaminationofthreeresults,fromtenlaboratories,on

twomaterials.

ds

11.155%aluminum-zincalloycoating;coatingweight

[mass];steelsheet;steelwire;zincalloycoatings;zinccoating;

SupportingdatahavebeenfiledatASTMInternationalHeadquartersandmay

beobtainedbyrequestingResearchReportRR:A05-1003.

4

8.3.1.2Ifthespecimenhasauniformthicknessofbase

metal,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/W

2

#

3G3Z(8)

where:

C=

W

1

=

W

2

=

G=

Z=

weight[mass]ofcoating,oz/ft

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedspecimen,,and

aconstant=326whenGisinin.,or12.8whenGis

inmm.

8.3.2ResultsinMetricUnits:

8.3.2.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/A

#

3N(9)

where:

C=

W

1

=

W

2

=

A=

N=

weight[mass]ofcoating,g/m

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

coatedareaoforiginalspecimen,in.

2

ormm

2

,and

aconstant=1.55×10

3

whenAisinin.

2

,or=1×10

6

whenAisinmm

2

.

8.3.2.2Ifthespecimenhasauniformthicknessofbase

metal,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/W

2

#

3G3Z(10)

where:

C=

W

1

=

W

2

=

G=

Z=

weight[mass]ofcoating,g/m

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedspecimen,,and

aconstant=9.95×10

4

whenGisinin.,or=3.92×

10

3

whenGisinmm.

9.1Weight[mass]ofcoatingonzinc-coatedsheetisex-

pressedinweight[mass]perunitareaofsheet,andiseitherthe

sumoftheweights[masses]ofcoatingonbothsidesofthe

sheet,orsinglesideweight[mass]oneachofthetwosides.

Weights[masses]ofcoatingoneachsideofthesheetarenot

TABLE1WeightMassCoating(

2

)

N

OTE

1—S

r

meansthestandarddeviationofr(repeatability).S

R

meansthestandarddeviationforR(reproducibility).

Material

HotDippedZinc-CoatedSamples

ElectrolyticZinc-CoatedSamples

x¯

1.100780

0.403221

S

x¯

0.021895

0.008790

S

r

0.015333

0.008378

S

R

0.025222

0.011138

r

0.042933

0.023457

R

0.070621

0.031187

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A90/A90M−13

loycoating;zinc-5to9%aluminum-magnesiumalloycoating;

zinc-9to13%aluminum-magnesiumalloycoating

zinc-5%aluminumalloycoating;zinc-5%aluminum-0.1%

magnesiumalloycoating;zinc-5%aluminum-mischmetalal-

SUMMARYOFCHANGES

CommitteeA05hasidentifiedthelocationofselectedchangestothisstandardsincethelastissue

(A90/A90M-11)thatmayimpacttheuseofthisstandard.(April1,2013)

(1)Addedreferencesto

A1057/A1057MandA1079in2.1and

6.1.

ASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentioned

fthisstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk

ofinfringementofsuchrights,areentirelytheirownresponsibility.

Thisstandardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteeandmustbereviewedeveryfiveyearsand

ifnotrevised,mmentsareinvitedeitherforrevisionofthisstandardorforadditionalstandards

mmentswillreceivecarefulconsiderationatameetingofthe

responsibletechnicalcommittee,eelthatyourcommentshavenotreceivedafairhearingyoushould

makeyourviewsknowntotheASTMCommitteeonStandards,attheaddressshownbelow.

ThisstandardiscopyrightedbyASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,

dualreprints(singleormultiplecopies)ofthisstandardmaybeobtainedbycontactingASTMattheabove

addressorat610-832-9585(phone),610-832-9555(fax),orservice@(e-mail);orthroughtheASTMwebsite

().PermissionrightstophotocopythestandardmayalsobesecuredfromtheASTMwebsite(/

COPYRIGHT/).

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Shanghai Jiaotong University pursuant to License Agreement. No further reproductions authorized.

2024年3月17日发(作者：卓海昌)

Designation:A90/A90M

−

13

StandardTestMethodfor

Weight[Mass]ofCoatingonIronandSteelArticleswith

ZincorZinc-AlloyCoatings

1

ThisstandardisissuedunderthefixeddesignationA90/A90M;thenumberimmediatelyfollowingthedesignationindicatestheyear

oforiginaladoptionor,inthecaseofrevision,rinparenthesesindicatestheyearoflastreapproval.

Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.

ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.

*

1.1Thistestmethodcoversproceduresfordeterminingthe

weight[mass]ofcoatingonironorsteelsheet,wire,andother

articlesinwhichthecoatingiszincorazincalloy,suchas

zinc-5%aluminum(includingzinc-5%aluminum-

mischmetalandzinc-5%aluminum-0.1%magnesium),zinc-

aluminum-magnesium(includingzinc-5to9%aluminum-

magnesiumandzinc-9to13%aluminum-magnesium)or55%

odyofthistestmethod,referenceto

zinccoatingshallbeinterpretedtoalsoincludezincalloy

coatingexceptwherespecificallystatedotherwise.

1.2Thefinalresultsdeterminedbythistestmethodshallbe

expressedininch-poundunitsorSIunits,dependingonthe

unitsusedinthematerialspecificationtowhichtheresultsare

nportionsoftheprocedureinvolving

determinationofspecimenweight[mass]havetraditionally

beenperformedinSIunits,andcorrespondinginch-pound

unitsarenotincluded.

1.3Forsheetproducts,thefinalresultsareexpressedas

eithercoatingweight[mass]totalbothsides,orcoatingweight

[mass]separatelyoneachside,dependingonthespecified

requirements.

1.4Thisstandarddoesnotpurporttoaddressallofthe

safetyconcerns,ifany,e

responsibilityoftheuserofthisstandardtoestablishappro-

priatesafetyandhealthpracticesanddeterminetheapplica-

cifichazards

statementssee

5.1.

ncedDocuments

2.1ASTMStandards:

2

A653/A653MSpecificationforSteelSheet,Zinc-Coated

(Galvanized)orZinc-IronAlloy-Coated(Galvannealed)

bytheHot-DipProcess

A792/A792MSpecificationforSteelSheet,55%

Aluminum-ZincAlloy-CoatedbytheHot-DipProcess

A875/A875MSpecificationforSteelSheet,Zinc-5%Alu-

minumAlloy-CoatedbytheHot-DipProcess

A1046/A1046MSpecificationforSteelSheet,Zinc-

Aluminum-MagnesiumAlloy-CoatedbytheHot-DipPro-

cess

A1057/A1057MSpecificationforSteel,StructuralTubing,

ColdFormed,Welded,Carbon,Zinc-Coated(Galvanized)

bytheHot-DipProcess

A1063/A1063MSpecificationforSteelSheet,Twin-Roll

Cast,Zinc-Coated(Galvanized)bytheHot-DipProcess

A1079SpecificationforSteelSheet,ComplexPhase(CP),

DualPhase(DP)andTransformationInducedPlasticity

(TRIP),Zinc-Coated(Galvanized)orZinc-IronAlloy-

Coated(Galvannealed)bytheHot-DipProcess

D1193SpecificationforReagentWater

E29PracticeforUsingSignificantDigitsinTestDatato

DetermineConformancewithSpecifications

ficanceandUse

3.1Thistestmethodprovidesastandardmethodfordeter-

miningtheweight[mass]ofcoatingforcomparisonwith

specifingofzinconironorsteel

rotection

isprovidedbysacrificiallossofzinc,thedegreeofprotection

isproportionaltotheweight[mass]fi-

cationsforzinc-coatedarticlesfrequentlyprovidefordifferent

classesofcoatingsothatthepurchasercanselectthecoating

weight[mass]mostsuitabletohisneeds.

ThistestmethodisunderthejurisdictionofASTMCommitteeA05on

Metallic-CoatedIronandSteelProductsandisthedirectresponsibilityof

SubcommitteeA05.07onMethodsofTesting.

CurrenteditionapprovedApril1,ally

eviouseditionapprovedin2011asA90/:

10.1520/A0090_A0090M-13.

1

ForreferencedASTMstandards,visittheASTMwebsite,,or

contactASTMCustomerServiceatservice@ualBookofASTM

Standardsvolumeinformation,refertothestandard’sDocumentSummarypageon

theASTMwebsite.

2

*ASummaryofChangessectionappearsattheendofthisstandard

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1

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A90/A90M−13

A1046/A1046M,A1057/A1057M,A1063/A1063M,orA1079

dependingonthetypeofcoating.

N

OTE

2—Forconvenienceincalculatingtestresultsininch-pound

units,thespecimenshouldhaveanareaof5.08in.

2

ofsheet(2.256

eter).Theweight[mass]of

coatingingramsonaspecimenofthatareaisnumericallyequaltothe

weight[mass]ultsto

bereportedinmetricunits,thespecimenshouldhaveanareaof3330mm

2

ofsheet(57.760.1-mmsquareor65.160.1mmindiameter).

ts

4.1PurityofReagents—Reagentgradechemicalsshallbe

otherwiseindicated,itisintendedthat

allreagentsshallconformtothespecificationsoftheCommit-

teeonAnalyticalReagentsoftheAmericanChemicalSociety,

wheresuchspecificationsareavailable.

3

Othergradesmaybe

used,provideditisfirstascertainedthatthereagentisof

sufficientlyhighpuritytopermititsusewithoutlesseningthe

accuracyofthedetermination.

4.2PurityofWater—Waterusedtopreparechemicalsolu-

tionsshallbereagentwaterasdefinedbyTypeIVof

SpecificationD1193.

4.3AntimonyTrichlorideSolution—Dissolve20gofSb

2

O

3

or32gofSbCl

3

in1000mLofHCl(spgr1.18to1.19).

4.4HydrochloricAcid(spgr1.18to1.19)—Concentrated

hydrochloricacid(HCl).

4.5HydrochloricAcid—AntimonyTrichlorideSolution—

Add5mLofantimonytrichloridesolutionto100mLofHCl

(spgr1.18to1.19).

4.6HydrochloricAcid(1+1)—Mix500mLofHCl(spgr

1.18to1.19)with500mLofreagentwaterandcooltoroom

temperature.

4.7SulfuricAcid(25+75)—Mix250mLofH

2

SO

4

(spgr

1.84)with750mLofreagentwaterandcooltoroom

temperature.

N

OTE

1—Itisadvisabletouseaninhibitorwithacidsolution(for

example,HexamethylamineTetramineorsimilar)attheconcentration

levelaccordingtothemanufacturer’srecommendationstopreventattack

ofthesubstrate.

6.2Zinc-CoatedWire—Samplesshallbesecuredasdesig-

natedintheappropriatespecificimenofwire

maybeofanylengthover12in.[305mm],butpreferably

about24in.[609mm].Whereacontinuouslengthisnot

available,shorterlengthstotalingover12in.[300mm],but

preferablyabout24in.[600mm],he

densityofthesteelisknown0.283lb/in.

3

[7830kg/m

3

],itis

notnecessarytouseaspecificlengthofspecimen.

6.3Zinc-CoatedArticlesOtherThanSheetorWire—

Samplesforweight[mass]ofcoatingdeterminationshallbe

securedasdesignatedintheappropriatespecifi

asotherwiseprovided,thespecimensshouldhaveaminimum

areaof3in.

2

(2000mm

2

)y

smallitems,severalpiecesmayhavetobestrippedtoobtain

theminimumarea.

6.3.1Inthecaseofthreadedarticles,suchasboltsand

screws,thedeterminationshallbemadeonaportionofthe

articlesthatdoesnotincludeanythread.

ure

7.1Stripthezinccoatingfromthespecimensbyusingone

ofthefollowingmethods:hydrochloricacid(1+1),hydro-

chloricacid-antimonytrichloridesolution,orsulfuricacid(25

+75).Forzincalloycoatingscontaininglessthan90%zinc,

thestrippingshallbedoneusinghydrochloricacid(1+1)or

sulfuricacid(25+75).

7.2Cleanthespecimensbywashingwithsolventnaphthaor

othersuitablesolvent,thenrinsewithalcohol,anddrythor-

oughly.

7.3Determinetheweight[mass]ofthespecimensindividu-

allytothenearest0.01g,exceptforarticlesotherthansheetor

wirewithaspecimenweight[mass]greaterthan125g,

determinetheweight[mass]

determiningtheweight[mass],immerseeachspecimensingly

inthestrippingsolutionandallowtoremainuntiltheviolent

evolutionofhydrogenhasceased,andonlyafewbubblesare

quiresabout15to30s,exceptinthe

caseofsherardizedcoatings,whichrequireasomewhatlonger

esolutionmaybeusedrepeatedlyuntilthetime

-

peratureofthestrippingsolutionshallatnotimeexceed100°F

[38°C].Afterstripping,washthespecimensbyscrubbingthem

underrunningwater,dipinhotwater,andwipeorblowdry.

Determinetheweight[mass]ofthespecimensagain,tothe

sameprecisionasintheinitialdetermination.

7.4SheetSpecimens—Whenmeasuringthetotalcoating

weight[mass]onbothsides,orthesinglesidecoatingweight

[mass]oneachside,determinetheareaofsheet(onesurface)

s

5.1Warning—Smallamountsofthepoisonousgasstibine

(SbH

3

)maybeevolvedduringthestrippingprocessusingthe

hloric

acidfumesarepresent,andhydrogengasisevolvedinthe

ore,thetestshouldbeperformed

oodis

recommendedforlargenumbersofsamplesorwherethetestis

tobecarriedoutfrequentlyoverextendedperiodsoftime.

5.2Warning—Mixingofsulfuricacidwithwatercould

mustbe

donebyslowlyaddingsulfuricacidtowaterduetotheheat

ocircumstances

ingshouldbe

performedunderanacidfumehood.

ng

6.1Zinc-CoatedSheets—Samplesforweight[mass]of

coatingdeterminationshallbesecuredinaccordancewith

Specifications

A653/A653M,A792/A792M,A875/A875M,

“ReagentChemicals,AmericanChemicalSocietySpecifications,”-

calSoc.,Washington,gestionsonthetestingofreagentsnotlistedby

theAmericanChemicalSociety,see“AnalarStandardsforLaboratoryU.K.

Chemicals,”BDHLtd.,Poole,Dorset,andthe“UnitedStatesPharmacopeia.”

3

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2

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A90/A90M−13

K=aconstant=652whenTisinin.,or=25.7whenTis

inmm.

tothenearest0.01in.

2

[5mm

2

].Ifspecimenswerepreparedto

thedimensionsasprovidedin

Note2,theyshallbepresumed

tohaveanareaof5.08in.

2

[3330mm

2

].Whenitisnotpossible

todeterminetheareaaccurately,asinspecimensfromcorru-

gatedsheets,thethicknessofthestrippedsheetshallbe

determinedtothenearest0.001in.[0.01mm].

7.4.1Whendeterminingthecoatingweight[mass]onone

sideofsheetmaterial,usetheproceduredescribedin

7.3,

exceptusea“stop-off”toprotectonesidefromthestripping

-resistantpaintsorlacquers,acid-resistanttape,

ormechanicaldevicesfastenedtothetestspecimenare

examplesofcommonlyused“stop-off”he

“stop-off”tothespecimenaftertheinitialdeterminationof

weight[mass]andremovebeforetheseconddeterminationof

weight[mass].Becauseofthepossibilityofmoistureabsorp-

tionduringthestrippingprocess,the“stop-off”mustnotbeon

thespecimenduringeitherweight[mass]determinations.

Determinethecoatingweight[mass]onthesecondside

subsequentlywithouta“stop-off”onthefirstside.

7.5WireSpecimens—Determinethediameterofthestripped

wiretothenearest0.001in.[0.01mm]bytakingtheaverage

oftwomeasurementsatrightanglestoeachother.

7.6SpecimensOtherThanSheetorWire—Determinethe

totalcoatedareaoftheoriginalspecimentothenearest0.01

in.

2

[5mm

2

].Alternatively,forspecimensofuniformthickness

ofbasemetal,suchasapieceofplateorpipe,determinethe

averagethicknessofthestrippedspecimentothenearest0.001

in.[0.01mm].

ation

8.1Zinc-CoatedSheet:

8.1.1ResultsinInch-PoundUnits:

8.1.1.1Whentheareaofonesurfaceofthesheetis

determined,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/A

#

3K(1)

8.1.2ResultsinMetricUnits:

8.1.2.1Whentheareaofsheetisdetermined,calculatethe

weight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/A

#

3K(3)

where:

C=

W

1

=

W

2

=

A=

K=

weight[mass]ofcoating,g/m

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

areaofonesurfaceofthesheet,in.

2

ormm

2

,and

aconstant=1.55×10

3

whenAisinin.

2

,or=1×10

6

whenAisinmm

2

.

N

OTE

4—Ifthespecimenwaspreparedtothedimensionsasprovidedin

Note2,havinganareaof3330mm

2

ofsheet,thefactorK/Ais

approximately300,whichmaybeusedinthecalculation.

8.1.2.2Whenitisnotpossibletoobtainaspecimenof

measurablearea,calculatetheweight[mass]ofcoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3T3K(4)

where:

C=

W

1

=

W

2

=

T=

K=

weight[mass]ofcoating,g/m

2

ofsheet

originalweight[mass]ofthespecimen,g,

weight[mass]ofthestrippedspecimen,g,

thicknessofstrippedsheet,,and

aconstant=1.99×10

5

whenTisinin.,or=7.83×

10

3

whenTisinmm.

8.2Zinc-CoatedWire:

8.2.1ResultsinInch-PoundUnits:

8.2.1.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3D3M(5)

where:

C=

W

1

=

W

2

=

A=

K=

weight[mass]ofcoating,oz/ft

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

areaofonesurfaceofthesheet,in.

2

ormm

2

,and,

aconstant=5.08whenAisinin.

2

,or=3.28×10

3

whenAisinmm

2

.

where:

C=weight[mass]ofcoating,oz/ft

2

ofstrippedwire

surface,

W

1

=originalweight[mass]ofspecimen,g,

W

2

=weight[mass]ofstrippedspecimen,g,

D=diameterofstrippedwire,,and

M=aconstant=163whenDisinin.,or=6.42whenDis

inmm.

8.2.2ResultsinMetricUnits:

8.2.2.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3D3M(6)

N

OTE

3—Ifthespecimenwaspreparedtothedimensionsasprovidedin

Note2,havinganareaof5.08in.

2

,thelossofweight[mass]ingramsis

numericallyequaltotheweight[mass]ofcoatinginouncespersquare

footofsheet.

8.1.1.2Whenitisnotpossibletosecureaspecimenof

measurablearea,calculatetheweight[mass]ofcoatingas

follows:

C5

@

~

W

1

2W

2

!

/W

2

#

3T3K(2)

where:

C=

W

1

=

W

2

=

T=

weight[mass]ofcoating,oz/ft

2

ofsheet,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedsheet,,and

where:

C=weight[mass]ofcoating,g/m

2

ofstrippedwire

surface,

W

1

=originalweight[mass]ofspecimen,g,

W

2

=weight[mass]ofstrippedspecimen,g,

D=diameterofstrippedwire,,and

M=aconstant=4.97×10

4

whenDisinin.,or=1.96×

10

3

whenDisinmm.

8.3Zinc-CoatedArticlesOtherThanSheetorWire:

8.3.1ResultsinInch-PoundUnits:

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3

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A90/A90M−13

C5

@

~

W

1

2W

2

!

/A

#

3N(7)

8.3.1.1Calculatetheweight[mass]ofcoatingasfollows:

where:

C=

W

1

=

W

2

=

A=

N=

weight[mass]ofcoating,oz/ft

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

coatedareaoforiginalspecimen,in.

2

ormm

2

,and

aconstant=5.08whenAisinin.

2

,or=3.28×10

3

whenAisinmm

2

.

necessarilyequal,evenwhenbothsidesareexposedtothe

g

weights[masses]onallzinc-coatedarticlesotherthansheets

areexpressedinweight[mass]perunitareaofsurface.

9.2Reporttheweight[mass]ofzinccoatingtothenearest

0.01oz/ft

2

whenreportingininch-poundunits.

9.3Reporttheweight[mass]ofzinccoatingtothenearest

1g/m

2

whenreportinginmetricunits.

9.4Whentheweight[mass]ofcoatingofanumberof

specimensistobeaveragedtodetermineconformancewitha

specificationlimit,theaveragevalueshallbereportedtothe

precisiondescribedin9.2and9.3inaccordancewiththe

RoundingMethodofPractice

E29.

ionandBias

10.1Theprecisionofthistestmethodisbasedonan

tenlaborato-

riestestedthreereplicatesoftwodifferentmaterials.

4

Datawas

recordedininch-poundunitsonlyandshouldnotbeconsidered

le1forastatisticalsummaryofthe

testresults.

10.1.1Repeatability—Twotestresultsobtainedwithinone

laboratoryshallbejudgednotequivalentiftheydifferbymore

thanthe“r”valueforthatmaterial;“r”istheinterval

representingthecriticaldifferencebetweentwotestresultsfor

thesamematerial,obtainedbythesameoperatorusingthe

sameequipmentonthesamedayinthesamelaboratory.

10.1.2Reproducibility—Twotestresultsshallbejudgednot

equivalentiftheydifferbymorethanthe“R”valueforthat

material;“R”istheintervalrepresentingthedifferencebe-

tweentwotestresultsforthesamematerial,obtainedby

differentoperatorsusingdifferentequipmentindifferentlabo-

ratories.

10.1.3Anyjudgmentinaccordancewiththesetwostate-

mentswouldhaveanapproximate95%probabilityofbeing

correct.

10.2Bias—Atthetimeofthestudy,therewasnoaccepted

referencematerialsuitablefordeterminingthebiasforthistest

method,thereforenostatementonbiasisbeingmade.

10.3Theprecisionstatementwasdeterminedthroughsta-

tisticalexaminationofthreeresults,fromtenlaboratories,on

twomaterials.

ds

11.155%aluminum-zincalloycoating;coatingweight

[mass];steelsheet;steelwire;zincalloycoatings;zinccoating;

SupportingdatahavebeenfiledatASTMInternationalHeadquartersandmay

beobtainedbyrequestingResearchReportRR:A05-1003.

4

8.3.1.2Ifthespecimenhasauniformthicknessofbase

metal,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/W

2

#

3G3Z(8)

where:

C=

W

1

=

W

2

=

G=

Z=

weight[mass]ofcoating,oz/ft

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedspecimen,,and

aconstant=326whenGisinin.,or12.8whenGis

inmm.

8.3.2ResultsinMetricUnits:

8.3.2.1Calculatetheweight[mass]ofzinccoatingas

follows:

C5

@

~

W

1

2W

2

!

/A

#

3N(9)

where:

C=

W

1

=

W

2

=

A=

N=

weight[mass]ofcoating,g/m

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

coatedareaoforiginalspecimen,in.

2

ormm

2

,and

aconstant=1.55×10

3

whenAisinin.

2

,or=1×10

6

whenAisinmm

2

.

8.3.2.2Ifthespecimenhasauniformthicknessofbase

metal,calculatetheweight[mass]ofcoatingasfollows:

C5

@

~

W

1

2W

2

!

/W

2

#

3G3Z(10)

where:

C=

W

1

=

W

2

=

G=

Z=

weight[mass]ofcoating,g/m

2

ofsurface,

originalweight[mass]ofspecimen,g,

weight[mass]ofstrippedspecimen,g,

thicknessofstrippedspecimen,,and

aconstant=9.95×10

4

whenGisinin.,or=3.92×

10

3

whenGisinmm.

9.1Weight[mass]ofcoatingonzinc-coatedsheetisex-

pressedinweight[mass]perunitareaofsheet,andiseitherthe

sumoftheweights[masses]ofcoatingonbothsidesofthe

sheet,orsinglesideweight[mass]oneachofthetwosides.

Weights[masses]ofcoatingoneachsideofthesheetarenot

TABLE1WeightMassCoating(

2

)

N

OTE

1—S

r

meansthestandarddeviationofr(repeatability).S

R

meansthestandarddeviationforR(reproducibility).

Material

HotDippedZinc-CoatedSamples

ElectrolyticZinc-CoatedSamples

x¯

1.100780

0.403221

S

x¯

0.021895

0.008790

S

r

0.015333

0.008378

S

R

0.025222

0.011138

r

0.042933

0.023457

R

0.070621

0.031187

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A90/A90M−13

loycoating;zinc-5to9%aluminum-magnesiumalloycoating;

zinc-9to13%aluminum-magnesiumalloycoating

zinc-5%aluminumalloycoating;zinc-5%aluminum-0.1%

magnesiumalloycoating;zinc-5%aluminum-mischmetalal-

SUMMARYOFCHANGES

CommitteeA05hasidentifiedthelocationofselectedchangestothisstandardsincethelastissue

(A90/A90M-11)thatmayimpacttheuseofthisstandard.(April1,2013)

(1)Addedreferencesto

A1057/A1057MandA1079in2.1and

6.1.

ASTMInternationaltakesnopositionrespectingthevalidityofanypatentrightsassertedinconnectionwithanyitemmentioned

fthisstandardareexpresslyadvisedthatdeterminationofthevalidityofanysuchpatentrights,andtherisk

ofinfringementofsuchrights,areentirelytheirownresponsibility.

Thisstandardissubjecttorevisionatanytimebytheresponsibletechnicalcommitteeandmustbereviewedeveryfiveyearsand

ifnotrevised,mmentsareinvitedeitherforrevisionofthisstandardorforadditionalstandards

mmentswillreceivecarefulconsiderationatameetingofthe

responsibletechnicalcommittee,eelthatyourcommentshavenotreceivedafairhearingyoushould

makeyourviewsknowntotheASTMCommitteeonStandards,attheaddressshownbelow.

ThisstandardiscopyrightedbyASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,

dualreprints(singleormultiplecopies)ofthisstandardmaybeobtainedbycontactingASTMattheabove

addressorat610-832-9585(phone),610-832-9555(fax),orservice@(e-mail);orthroughtheASTMwebsite

().PermissionrightstophotocopythestandardmayalsobesecuredfromtheASTMwebsite(/

COPYRIGHT/).

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