摘要
选择了两种化学成分相似的低合金钢,借助电子探针对其夹杂物做了分析鉴定,通过极化试验、模拟闭塞腐蚀电池试验和显微分析探讨了低合金钢内夹杂物在点蚀过程中的作用。结果表明,低合金钢内夹杂物是最主要的点蚀诱发源,含硫化物的复相夹杂诱发点蚀的能力高于其它夹杂,在点蚀扩展过程中,夹杂物优先溶解脱落形成腐蚀坑,对点蚀扩展有明显促进作用;经钙处理和炉外精炼工艺的低合金钢中夹杂物数量少、体积小,其点蚀点位较高,点蚀扩展速率较低。
Two low alloy steels with similar chemical compositions were selected as objects of research. Inclusions in them were analyzed by electronic probe micro-analyzer. The effects of inclusions in low alloy-steels were discussed by polarization tests and simulated occluded corrosion cell combined with microanalysis. The results showed that the inclusions in low alloy-steels are the main pitting initiation and the sulfide inclusions are easier to cause pitting corrosion than other inclusions; inclusions also accelerates pitting corrosion propagation and forms deep pit after dissolving; pitting potential of the alloy-steel by calcium treated and refined secondarily was nobler than that of the steel without because of the less and smaller inclusions; at the same time, pitting propagating rate of the steel treated by calcium and refined secondarily was also less than that of the steel without treatment.
出处
《装备环境工程》
CAS
2013年第1期13-16,37,共5页
Equipment Environmental Engineering
关键词
低合金钢
夹杂物
点蚀
low alloy-steels
inclusions
pitting
