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采用铸渗方法制备出以灰铸铁为基材,以铬铁和硼铁作为合金化表面层的材料。通过失重法、金相分析、SEM和EDS等手段研究了该材料表面的耐锌液腐蚀性能,探讨了其腐蚀机理。结果表明,合金化表面的Cr是以高铬碳化物的形式块状分布在莱氏体基体上,Cr的存在使铁锌合金δ相的稳定性提高,且铁锌扩散受到阻挡;莱氏体对锌液基本不润湿,降低了锌液对基体的润湿能力。以上两个因素共同作用,使得铬铁硼铁合金化表面的耐液态锌腐蚀性能得到很大提高,其抗锌液腐蚀的能力比灰铸铁提高了8倍。
Casting infiltration method was used to prepare gray iron as the substrate, ferrochrome and ferroboron as the alloying surface layer of the material. The corrosion resistance of zinc-based solution on the surface of the material was investigated by weight loss method, metallographic analysis, SEM and EDS. The corrosion mechanism was also discussed. The results show that the Cr on the alloying surface is distributed in the form of high-chromium carbides on the ledeburite matrix. The presence of Cr improves the stability of the δ phase of the iron-zinc alloy and the diffusion of iron and zinc is blocked. The basic non-wetted zinc solution, reducing the liquid zinc wetting ability of the substrate. The combined effect of these two factors makes the liquid zinc corrosion resistance of the ferrochromium ferroalloyed alloy surface greatly improved, and its resistance to zinc liquid corrosion is improved by eight times compared with gray cast iron.