effects of tungsten carbide thermal spray coating by hvof on fatigue and corrosion外语英文电子书

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1、SurfaceandCoatingsTechnology1382001113Ž.
124EffectsoftungstencarbidethermalspraycoatingbyHP
HVOFandhardchromiumelectroplatingonAISI4340highstrengthsteela,
baMarcelinoP.Nascimento,RenatoC.Souza,IvancyM.Miguel,WalterL.caPigatin,HermanJ.C.VoorwaldaStateUniersityofSaoPaulo-DMT-UNESP´
FEG,

2、A.AribertoPereiradaCunha,333-Guaratingueta
SP
BR-CEP:12500-000,BrazilbFAENQUIL
DEMAR,Lorena
SP
BR-CEP:12600-000,BrazilcEMBRAER-LIEBHERR
EDE,SaoJosedosCampos´
SP
BR-CEP:12237-540,BrazilReceived26August1999;receivedinrevisedform5October2000;accepted7November2000AbstractIncasesofdecorati

3、veandfunctionalapplications,chromiumresultsinprotectionagainstwearandcorrosioncombinedwithchemicalresistanceandgoodlubricity.However,pressuretoidentifyalternativesortoimproveconventionalchromiumelectroplatingmechanicalcharacteristicshasincreasedinrecentyears,relatedtothereductioninthef

4、atiguestrengthofthebasematerialandtoenvironmentalrequirements.Thehighefficiencyandfluoride-freehardchromiumelectroplatingisanimprovementtotheconventionalprocess,consideringchemicalandphysicalfinalproperties.Oneofthemostinteresting,environmentallysaferandcleaneralternativesforthereplacemen

5、tofhardchromeplatingistungstencarbidethermalspraycoating,appliedbythehighvelocityoxy-fuelHVOFprocess.TheaimofthisstudywastoanalysetheeffectsofthetungstenŽ.carbidethermalspraycoatingappliedbytheHP
HVOFprocessandofthehighefficiencyandfluoride-freehardchromiumelectroplatinginthepresentpaper

6、calledaccelerated,incomparisontotheconventionalhardchromiumelectroplatingontheŽ.AISI4340highstrengthsteelbehaviourinfatigue,corrosion,andabrasiveweartests.TheresultsshowedthatthecoatingsweredamagingtotheAISI4340steelbehaviourwhensubmittedtofatiguetesting,withthetungstencarbidethermalsp

7、raycoatingsshowingthebetterperformance.Experimentaldatafromabrasiveweartestswereconclusive,indicatingbetterresultsfromtheWCcoating.Regardingcorrosionbysaltspraytest,bothcoatingswerecompletelycorrodedafter72hexposure.ScanningelectronmicroscopytechniqueSEMandopticalmicroscopywereusedto