Abstract
Corrosive wear is a key factor affecting the safe operation of offshore engineering equipment. In this study, Co19.6Cr19.6Fe19.6Ni19.6(B13.72Si5.88)19.6Y2 and Fe43.6Ni17.4Cr9Co6B17.5Si1.5Nb5 coatings were prepared on the surface of 304 stainless steel using laser cladding technology. Dry wear and corrosive wear behavior of both coatings and 304 stainless steel were comparatively studied under different loads. The results show that both coatings are mainly composed of FCC solid solution, boride, and Laves phases. The average microhardness of Co19.6Cr19.6Fe19.6Ni19.6(B13.72Si5.88)19.6Y2 and Fe43.6Ni17.4Cr9Co6B17.5Si1.5Nb5 coatings are 578.6 HV0.2 and 632.5 HV0.2, respectively. The dry wear resistance of Fe43.6Ni17.4Cr9Co6B17.5Si1.5Nb5 coating is approximately 3 times that of 304 stainless steel under all friction load conditions. It can be found that the Fe43.6Ni17.4Cr9Co6B17.5Si1.5Nb5 coating with high hardness is less sensitive to friction load changes during dry wear process. In 3.5 wt% NaCl solution, the corrosive wear resistance of CoCrFeNiBSiY coating under friction loads of 30 N and 50 N is 2.68 times and 2.83 times that of 304 stainless steel, respectively. The excellent corrosive wear resistance performance of the CoCrFeNiBSiY coating is mainly attributed to its superior corrosion resistance and repassivation ability. During the corrosive wear process, a dense passivation film is formed on the surface of both coatings, which significantly reduces their friction coefficient and volume loss rate.
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