Study on wear and corrosion resistance of Stellite 6 alloy coating prepared by laser cladding
In order to improve the wear and corrosion resistance of SUS630 stainless steel(SS)used as valve stem,Stellite 6 cobalt-based alloy coating was prepared on its surface by laser cladding technology.The microhard-ness,wear and corrosion properties of Stellite 6 coating and SUS630 SS were studied.The results show that compared with SUS630 SS,the hardness of Stellite 6 coating increases by 25％and the wear volume decreases by 50％,indica-ting that Stellite 6 coating has better wear resistance than SUS630 SS.In addition,in 3.5％NaCl solution,the corro-sion potential(-0.18 V)and the impedance value of the passive film(367 kΩcm2)of the Stellite 6 coating were higher than that of SUS630 SS(-0.35 V and 129 kΩcm2),while the passivation current density(10-7-10-6 A/cm2)of Stellite 6 coating was lower than that(10-6-10-5 A/cm2)of SUS630 SS,indicating that Stellite 6 coating has better corrosion resistanc than SUS630 SS.Therefore,laser cladding Stellite 6 coating can improve the wear and corrosion re-sistance of SUS630 SS.
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