摘要
采用电化学技术、X射线光电子能谱、原子力显微镜测试和浸泡实验研究了有/无热处理的等原子比CoCrFeMnNi高熵合金和管线钢在碱性土壤模拟溶液中的耐蚀性差异。结果表明:高熵合金呈现出局部腐蚀特征,腐蚀形态为零星分布的针孔状点蚀,而X80和X100管线钢表面发生了全面腐蚀,并有大尺寸腐蚀坑存在。高熵合金热处理后在碱性土壤模拟溶液中形成的钝化膜结构致密稳定,含有较多Cr的氧化物和水以及更少的FeO,有利于其钝化膜的保护性;而管线钢钝化膜薄且含有缺陷,对基体的保护性较差。有/无热处理高熵合金的耐蚀性均优于X80和X100管线钢,且热处理可提升高熵合金的耐蚀性能。
The difference in the corrosion resistance between the as-cast and heat treated equiatomic CoCrFeMnNi high entropy alloy(HEA) and hot rolled X80 and X100 pipeline steels in a simulated alkaline soil solution was investigated by immersion test, electrochemical tests, XPS and AFM. The results show that the high entropy alloy exhibits the characteristics of local corrosion, and few pits are sporadically distributed on its surface, while X80 and X100 pipeline steels display the characteristics of severe general corrosion, with large size corrosion pits. Moreover, the passive film of HEA is compact and stable,and contains more Cr oxide, bound water and less FeO, which is conducive to increasing its corrosion resistance, whereas the passive film of pipeline steel is thinner and defective, and has poor protective ability. The corrosion resistance of the HEA before and after heat treatment is all better than those of X80 and X100 pipeline steels, and the corrosion resistance of the HEA can be further improved by heat treatment.
作者
赵宝珠
朱敏
袁永锋
郭绍义
尹思敏
ZHAO Baozhu;ZHU Min;YUAN Yongfeng;GUO Shaoyi;YIN Simin(School of Mechanical Engineering and Automation,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2022年第3期425-434,共10页
Journal of Chinese Society For Corrosion and Protection
基金
浙江省自然科学基金(LY18E010004和LY19E020015)
国家市场监督管理总局科技计划项目(2019MK134)。
关键词
高熵合金
管线钢
耐蚀性
点蚀
钝化膜
HEA
pipeline steel
corrosion resistance
pitting corrosion
passive film
作者简介
赵宝珠,男,1996年生,硕士生;通讯作者:朱敏,E-mail:zmii2009@163.com,研究方向为金属材料的腐蚀与防护。
