摘要
在ZG40Cr25Ni20的基础上降低Ni的含量,增加Cr、Mo的含量,获得一种经济节镍型耐热铸钢。通过在6%的Fe Cl3溶液中浸泡测得材料的失重曲线,并运用循环极化方法研究它们在3.5%Nacl溶液中的点蚀行为,借助SEM扫描电镜、X射线面扫描及EDX能谱探究了材料表面点蚀萌生及发展的机理,通过增加Cr和Mo的含量,Cr的添加有利于形成致密的可通过再钝化过程实现自我修复的含Cr的钝化膜,Mo的添加有利于形成覆盖在点蚀坑上的Mo O3,可提高材料的耐点蚀性能。
To obtain an economic low nickel heat resistant cast steel on the basis of ZG40Cr25Ni20, reducing the amount of Ni and increasing the amount of Cr, Mo, weight loss curves of two kinds of heat resistant cast steel were gained by soaking in 6wt% Fe Cl3 solution. Cyclic polarization measurement in 3.5wt% Na Cl was used to study the pitting corrosion behavior of two heat resistant steel. Additionally, the mechanism of the corrosion attack developed on the material surface was researched by scanning electron microscope（SEM）, chemical microanalysis by energy dispersive spectrometry（EDS）, X-ray mapping analysis. With the amount of Cr, Mo increasing, the Cr can promote the passive film form, and passive film is compact and self repair can be achieved by repassive process, Mo O3 can be formed on the surface of pitting corrosion pit by adding Mo, the pitting corrosion resistant property was increased.
出处
《铸造》
CAS
CSCD
北大核心
2015年第10期955-959,共5页
Foundry
关键词
耐热钢
点蚀
钝化膜
heat resistant steel
pitting corrosion
passive film
