ATGM是什么意思M在线翻译读音例句

GMGfl4372M92a9OOb379-

I

GENERALMOTORSENGINEERINGSTANDARDS

I

MaterialsandProcesses-Metals

I

DECORATIVECHROMIUMPLATING-COPPER,NICKEL,CHROMIUMTYPE

GM4372MGM4373MGM4374M

pecificationscoverbasicrequirements

forelectroplatedpartsofthecopper-nickel-chromiumtypeas

usedonsteel,zincdiecast,copperbasedalloys,andplastic

components,andwrought,die-castorforgedaluminumand

aluminumalloys,excludingwheels.

1.1GM4372MandGM4374Mareintendedforexteriorparts

4374Mpro-

videscorrosionprotectionforsevereserviceconditionsthat

includelikelydamagefromdenting,scratchingandabrasive

wearinadditiontocorrosiveenvironmentssuchasencoun-

specificationdiffersfromGM4372Minthatitrequiresa

longercorrosion(CASS)4372Mprovidescorro-

sionprotectionforcorrosiveenvironmentswhichreceivelittle

ecificationsrequirethe

useofdiscontinuouschromiumplateinadditiontoamultiple

layernickelsystem.

notrequiretheuseofdiscontinuouschromiumormultiple

layernickelsystems.

1.3Whenspecif芙蓉如面柳如眉 yingchromiumplatingonaluminum,acoat-

ingmustbeappliedtoallofthenon-significantsurfaceswhich

donotreceiveafullcomplementofplateandareexposedto

izedwaxorothercor-

rosionprotectivecoatingsarerecommended,

2REFERENCEDSTANDARDS.

GM4260PASTMB456

ASTMB764

GM9071PASTMB487

ASTMB368ASTMB571

3REQUIREMENTS.

edeterminedbythe

microscopicmethod(ASTMB487)ortheelectrochemical

methodofGM4260PIncaseofdisagreementsbetweenpur-

chaserandsupplier,themicroscopicmethodshallbethe

preferredmethod.

3.1.1MinimumplatethicknessasspecifiedinTable1is

intendedtoapplytoalllowcurrentdensityandhighcurrent

densityareasofsignificantsurfacesasspecifiedonappropriate

partdrawingsorasotherwiseagreeduponbetweenpurchaser

rfacesarethosenormallyvisible-

directlyorbyreflection-onthefishedpartwhenassembled

incarposition,orwhichcanbethesourceofcorrosiondepos-

itsthatdefacevisiblesurfacesontheassembledvehicles.

3.1.2Themultiplelayernickelthicknessconsistingofatleast

2layersofelectro-depositednickelshallbeaminimumof

60%semibrightnickel,exceptwhenhighactivitynickelstrike

isusedbetweenthesemibrightandbrightnickellayers,then

thesemibrightthicknessshallbeaminimumof40%.

3.1.3Minimumthicknessandcorrosionresistanceperfor-

mancerequirementsfortexturedfinishes(matte,vaporblast,

brush,etc.)applyaftertexturing.

3.1.4Exceptionstotheminimumplatingthicknessaregener-

allyshownasadetailonthepartdrawingbyeither

designatingplatingcheckpoint(s)orbyindicatinginanappro-

priateviewthearea(s)withdeviatedthickness(es)allowed.

Theseexceptionsmuststillmeetthespecifiednumberofcor-

rosiontesthours.

3.2NICKEL

ELECTROCHEMICAL

POTENTIAL

(GM4372MANDGM4374MONLY).Determinepotential

differencefollowingASTMB764.

3.2.1Thebrightnickellayershallexhibitananodicelectro-

chemica昆山玉碎凤凰叫下一句是什么 lpotentialdifferenceof100mVminimumtosemi-

mancetothis

requirementshallbedeterminedwith99%confidence(3

sigma)usingappropriatestatisticalchartingtechniquesona

routinequalitycontrolbasis.

3冷月无声 .2.2Themaximumelectrochemicalpotentialdifference

betweenthemicroparticulatenickellayerandthebrightnickel

onallsignificantsurfacesofallsubstratesis20mV.

eperformed

byeitherthecopperdeposition(Dubpemell)methodorbythe

determinationofactivecorrosionsitesaftercorrosiontesting.

ase

ofanactivesitesdetermination,comparetheviewedsampleat

100XtotheporedensitychartsshowninAppendixAofthis

specificationtodetermineporecount.

3.3.1Themicrodiscontinuouschromiumsurfaceshallexhibit

aminimumof10000pores/cm2asdeterminedbycopperdep-

ositionor2000pores/cm2asdeterminedbyactivesites.

edeterminedby

theCASStest,ASTMB368,accordingtothenumberofhours

specifiedinTable1.

3.4.1Platedcomponentsshallbefreeofcorrosiononallsig-

nificantsurfaceswhenexaminedatnormalreadingdistance

withtheunaidedeyeanduniformdiffusedlight.

metalliccomponentsshallbesub-

jectedtotheSaw-GrindTest,ASTMB571,withnoevidence

ofliftingorpeelingeitherbetweenplatedlayersortheplate

andthesubstrate.

3.5.1Platedplasticpartsshallbesubjecttothethermal

onclusionofthetest

sequencetheplatedpartshallshownodeformation,crazing,

blistering,splitting,orlossofadhesiontothesubstrateorloss

ofadhesionbetweenindividuallayersoftheplatedmetal.

0CopptghtJUNE1992GmerdMotors最美的山水诗 CorporationAllRightsReserved

JUNE1992PAGE14372M

CopyrightGeneralMotorsNorthAmerica

ProvidedbyIHSunderlicensewithGMLicensee=SAMLIPINDUSTRIALCOLTD/5924211001

NotforResale,09/21/200703:02:48MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS

-

-

`

`

`

,

`

`

`

`

,

`

,

,

,

,

`

,

`

,

`

`

,

,

,

,观沧海原文及注释及翻译

,

,

,

,

-

`

-

`

,

,

`

,

,

`

,

`

,

,

`

-

-

-

G[Gfl4372fl92-900b379m

I

GENERALMOTORSENGINEERINGSTANDARDS

I

MaterialsandProcesses-Metals

I

DECORATIVECHROMIUMPLATING-COPPER,NICKEL,CHROMIUMTYPE

GM4372MGM4373MGM4374M

3.5.2Thethermalcyclingtestshallbeperformedasfollows:

(4

(b)

(cl

Cd)

(4

(0

k)

04

Whencorrosiontestisspecified,exposepartfor22h

minimumCASSpriortoStep(b).Whencorrosion

testisnotrequired,completelyimmersepartinwater

maintainedat38f15Cfor22hpriortoStep(b).

Mountpartinarestrainedpositionsimulatinginser-

rmaximumisallowedbetween

endofStep(a)andstartofStep(c).

Exposepartfor1hminat-30f1.5”C.

Exposepartfor15minutesminimumat25+5C.

Exposepartfor1hmininanaircirculatingovenat

85f1.5”C.

Exposepartfor15minutesminimumat25f5C.

Steps(c)thru(f)

Steps(c)thru(f)3additionaltimesforatotalof4

epartpertherequirementsin3.5.2

aftereachcycle.

Forpartsnotcompletelyenvelopedwithelectroplate,

followingthefourthcycle,scribeanXthroughthe

platingatthestopoffdemarcationintotheb廉组词 asic

material;placepressuresensitiveadhesiontape,as

imately20mmwide

overtheX(leavingsufficientlengthoftapetograsp

betweenfingersforquickremoval);q小众干净的id uicklypulltape

atapproximately90degreestothesurfaceofpartto

eforevidenceoflifting

ofelectroplate.

4SAMPLING.

Methodsofsamplingandresampling,

andthebasisofrejection,shallbesubjecttomutualagreement

berofsamplestobe

selectedandthefrequencyofselectionwill,ingeneral,depend

uponthenumberofpiecesplated.

mentshall

bemadebyanysupplieruntilrepresentativeinitialproduction

sampleshavebeenapprovedbyengineeringasmeetingthe

requirementsofthisspecification.

5.1CompletedcopiesoftheGMMaterialSafetyDataSheet

andCriticalMaterialRegister(availablefromtheengineering

departmentorlaboratory),orequivalent,mustbesubmitted

withanynewsubmissionsorwhereacompositionchangehas

occurred.

pmentsof

materialorpartsundercontractorpurchaseordermanufac-

turedtothisspecificationshallbeequivalentineveryrespect

hallbe

nochangesineitherformulationormanufacturingprocesses

permittedwithoutpriornotificationandapprovalbyengineer-

notificationbythesupplierconstitutesgrounds

amplesmaybetaken

fromincomingshipmentsandcheckedforconformancetothis

specification,thesuppliershallaccepttheresponsibilityfor

incomingshipmentsmeetingthisspecificationwithoutdepen-

denceuponpurchaser’sinspection.

eringqualification

sourceslistedintheGMCorporateMaterialsFileunderthis

specificationnumberhavebeenqualifiedbyengineeringas

meetingtherequirementsofthisspecification,Sourcesare

availablethroughtheon-lineMATSPCSystem.

andardwasfirst

estrevisionsinclude:

scription

E

7189Completerevision

F

4192RevisiontoaddAluminumSubstrates

0CopyightJUNE1992GeneralMotorsCorporationAllRightsRwa-wd

4372M

PAGE2

JUNE1992

CopyrightGeneralMotorsNorthAmerica

ProvidedbyIHSunderlicensewithGMLicensee=SAMLIPINDUSTRIALCOLTD/5924211001

NotforResale,09/21/200703:02:48MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS

--```,````,`,,,,`,`,``,,,,,,,,-`-`,,`,,`,`,,`---

GMGM4372M92-=lOOb37=l-

IGENERALMOTORSENGINEERINGSTANDARDS

I

MaterialsandProcesses-Metals

I

DECORATIVECHROMIUMPLATING-COPPER,NICKEL,CHROMIUMTYPE

GM4372MGM4373MGM4374M

TABLE1

NOTE1:Fornonwearinteriorparts,minimumchromiumthicknessmaybe0.13tmr,alisindicatedbyadditionof

symbol(B)4373M(B).”

NOTE2:sedatsupplieroption,thennickelmustbeusedtomeetthetotalplatethicknessrequirement.

WhencopperisnotusedwhenplatingsteelsubstratestoGM4372MorGM4374Mrequirements,thetotalminimumthicknessisreducedto30pm.

NOT!?3:ofchromium

depositsfromtrivalentchromiumbathsisnotpermittedunlessotherwisespecifiedonthedetaildrawing.

NOTE4:TinCobaltalloymaybeusedinlieuofchromiumwhensymbol(K)“GM4373M(K)“.

NOTE5:Forcloisormdtypesubstrates,copperisoptional.

NOTE6:Suitablepreueatmentprocessesmustbtreatmentof

aluminumprocessesmustpassallvisualadhesionandcorrandeach

typeofmanufacturingprocessofaluminum.

NOTE7:Allplatedcomponentsmustreceiveanaluminizedwaxorothercorrosion-resistantcoatingonnonsignificantsurfacesunlessotherwise

specifiedonthedrawing.

QCopyrightJUNE1592Gem-alMotorsCorporationAllFlightsResemd

JUNE1992PAGE34372M

CopyrightGeneralMotorsNorthAmerica

ProvidedbyIHSunderlicensewithGMLicensee=SAMLIPINDUSTRIALCOLTD/5924211001

NotforResale,09/21/200703:02:48MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS

--```,````,`,,,,`,`,``,,,,,,,,-`-`,,`,,`,`,,`---

GMGM4372192-900b379000835L423m

IGENERALMOTORSENGINEERINGSTANDARDS

I

MaterialsandProcesses-Metals

I

DECORATIVECHROMIUMPLATING-COPPER,NICKEL,CHROMIUMTYPE

GM4372MGM4373MGM4374M

APPENDIXA

APPENDIX-POREDENSITYCHARTS(lmmBYlmm)

1000PORES/cm’AT100X

.

.

.

’.

.

.

.

2000PORES/cm’AT100X

.

.

.

.

.

.

.

.

.

.

.

.

5000PORES/cm’AT100X

...

’l.

.

l.

.

..

.

...

.

.

..

.

.

.l

.

.

.

.

.

.l*l

.

.l

.

.

..

-9

9.’

.

.

.

.

.

10000PORES/cm’AT100X

,*

.

..

l.

l-..l

.

:.

.

..

.

.

.l

.

l.

.

.

.‘9,

.

..

.

.

.

l..

.

l.

.

..

.

.

.

l.l

.

.

.

.

.

.

.

l.

.

.

.

.

.

.

.

.

.l.*

.

.

..

l*.

.

l.

..

.

.

.

.’

.

.

.

.

.

.

4372-AO1(4/92)

4372-AO2(4/92)

JUNE1992

PAGE4

4372M

CopyrightGeneralMotorsNorthAmerica

ProvidedbyIHSunderlicensewithGMLicensee=SAMLIPINDUSTRIALCOLTD/5924211001

NotforResale,09/21/200703:02:48MDTNoreproductionornetworkingpermittedwithoutlicensefromIHS

--```,````,`,,,,`,`,``,,,,,,,,-`-`,,`,,`,`,,`---