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研究了超音速火焰喷涂制备的MoB-CoCr涂层在熔融锌液中的腐蚀情况,并分析锌液对MoB-CoCr涂层的腐蚀机理。结果表明,涂层中的缺陷孔隙成为裂纹源,而MoB-CoCr涂层的残余应力、淬火应力以及涂层与不锈钢热膨胀系数不匹配所产生的应力使涂层开裂,甚至涂层与基体发生剥离,锌渗入到涂层缺陷中使裂纹扩展,形成沿着裂纹的腐蚀,加速了涂层的失效。
The corrosion of MoB-CoCr coating prepared by supersonic flame spraying in molten zinc solution was studied. The corrosion mechanism of MoB-CoCr coating by zinc solution was analyzed. The results show that the defects in the coating become the source of cracks, and the residual stress and quenching stress of the MoB-CoCr coating and the stress caused by the mismatch between the thermal expansion coefficient of the coating and the stainless steel cause the coating to crack and even the coating peels off from the substrate The penetration of zinc into the coating defects causes the cracks to propagate, creating corrosion along the cracks, accelerating the failure of the coating.