本文研究了中碳低合金钢Cr—Mo涂层的激光合金化熔区的显微结构和耐蚀性能。实验结果表明,在3Cr18Mo6合金化涂层中存在大量的块状奥氏体,经激光处理能抑制或大大减少χ相,σ相及碳化物的析出。该合金化层在0.5mol/L H_2SO_4中耐蚀性优于18-8不锈钢,同时在含Cl离子的介质中没有发生点蚀现象,具有优异的耐点蚀性能
The precipitation of x--phase, σ--phase and carbides may be restrained or elimi-nated by laser melting the plasma sprayed Cr--Mo alloy coating, in which austenite of abundant block usually occurred, on medium carbon low alloying steel. The corrosion resistance of this coating to 0.5 mol / L H_2SO_4 was examined to be superior to that of 18--8 stainless steel. The laser alloying Cr--Mo coating also has excellent resistance to pitting corrosion, and no pitting appeared even it immersed in a medium containing Cl~(-) ions.
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