氮合金化堆焊硬面合金的耐腐蚀性能研究  

Corrosion Resistance of Nitrogen-alloying Hardfacing Alloy

作　　者：杨可[1] 杨克[1] 包晔峰[1] 

机构地区：[1]河海大学机电工程学院,江苏常州213022

出　　处：《材料工程》2015年第5期33-37,共5页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51101050);江苏省自然科学基金资助项目(BK20141156);中央高校基本科研业务费专项资金(2013B18114)

摘　　要：在马氏体不锈钢中加入氮合金,并通过铌、钒、钛固氮形成氮合金化堆焊硬面合金,进行了电化学腐蚀和化学侵蚀实验,研究了硬面合金的耐腐蚀性能。结果表明:堆焊硬面合金的氮合金化,抑制了铬的碳化物的析出,有效增强了钝化膜的稳定性,使硬面合金的自腐蚀电位从-345mV提高到-264mV,增强了堆焊硬面合金抗电化学腐蚀性能;氮合金化堆焊硬面合金均匀细小的组织形态,使得在FeCl3溶液中发生点蚀的蚀坑小且分散,提高了硬面合金的耐腐蚀性能。The nitrogen-alloying hardfacing alloy of martensite stainless steel was made through the addition of nitrogen alloy and the nitrogen-fixing elements of niobium, vanadium and titanium. The corrosion resistance of hardfacing alloy was investigated through electrochemical corrosion and chemi- cal erosion tests. The results show that nitrogen-alloying of hardfacing alloy inhibits the precipitation of chromium carbides and the chemical stability of passivating film is effectively strengthened, the cor- rosion potential increases from --345mV to --264mV, and thus the electrochemical corrosion resist- ance of hardfacing alloy is strengthened. Owing to the uniform and fine microstructure of nitrogen-al- loying hardfacing alloy, pits are fine and dispersed when pitting corrosion occurs on the hardfacing alloy in the FeCl3 solution, therefore the corrosion resistance of hardfacing alloy is improved by nitrogen alloying.

关 键 词：氮合金化 马氏体不锈钢 硬面合金 耐腐蚀性能 

分 类 号：TG442[金属学及工艺—焊接]