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CorrosionandFati g ueBehaviorofSteelforOffshoreWindTurbineBolts

1
1
1
1
,
WUZhon g zhon g LIUDa y on g YAN Wen j i , DINGYanchao ,
,

1 , 2 3
ZHANGPen g PIAOJunkai , QU Min gg ui

( 1.ChinaGuan g don gNuclear ( FuJian ) WindPowerGenerationCo. , Ltd. , Fuzhou 350001 , China ;

2.SchoolofMechanicalEn g ineerin g , YanshanUniversit y , Qinhuan g dao066004 , China ;

3.ShenzhenResearchInstitute , YanshanUniversit y , Shenzhen518057 , China )

Abstract : Corrosiontestswereconductedonboltsteel42CrMoAinthesimulatedserviceenvironmentofoffshorewind

turbineboltsinthes p lashzoneandatmos p hericzonethrou g halternatin gwetdr y c y clesofsalts p ra y .Thecorro sionp roducts

wereobservedb y scannin gelectronmicrosco py ( SEM ) andtheirelementsweredetectedb yener gydis p ersives p ectrosco py

( EDS ) .The mor p holo gyofcorrosionp itswascharacterizedb yo p ticalp rofilometer , andthefati g uecrackg rowthafter

corrosionwasstudiedb yin-situfati g uetestin g machine.Theresultsshowthatinthec y clicsalts p ra yenvironmentwith

alternatin g dr y andwetcond itions , thecorrosionmasslossp erunitareaof42CrMoAsteelandcorrosiontimeexhibiteda

p owerfunction.Therewasalinearrelationshi pbetweenthesurfacerou g hnessandcorrosiontimeof42CrMoAsteel.The

initiationandp ro p a g ationoffati g uecrackswere p romotedb y corrosion p its , andtheex p ansionandmer g in g ofmulti p lecracks

acceleratedthefractureofthes p ecimen , thereb y reducin g t hefati g uelife.

Ke ywords : bolt ; 42CrMoAsteel ; salts p ra y test ; corrosion ; fati g ue

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