摘要
采用动电位极化曲线和电化学阻抗法的方法研究了热处理工艺对254SMO不锈钢在3.5 g/L的Na Cl溶液中的腐蚀行为。并借助金相显微镜(OM)观察热处理后的组织形貌,探讨了显微组织和腐蚀性能之间的关系。结果表明,随固溶温度的升高,析出物逐渐溶解于晶粒内,晶粒逐渐长大,并出现大量孪晶;腐蚀速率先增大后减小,1150℃时腐蚀速率最大;1250℃固溶处理可以得到良好的耐腐蚀性和均匀的组织。
The effects of solution treatment on electrochemical corrosion of 254SMo stainless steel in 3.5 g/L NaC1 solution were studied by potentiodynamic scanning （PDS） and electrochemical impedance spectroscopy （EIS）. The microstructure of the steel after heat treatment was observed by OM to explore the relationship between microstructure and corrosion. The results show that with the increase of solid solution temperature, the precipitates dissolve in the grain, the grain becomes larger, and the number of twins increases; the corrosion rate increases firstly and decreases subsequently with the increase of aging temperature. The corrosion rate of the steel heat treatment at 1150 ℃is fastest. Solution treatment at 1250℃ can gain good corrosion resistance and homogeneous microstructure.
出处
《热加工工艺》
CSCD
北大核心
2014年第20期170-172,共3页
Hot Working Technology
基金
山西省高等学校科技创新项目资助(2013108)
关键词
254SMO不锈钢
电化学腐蚀
热处理
254SMo stainless steel
electrochemical corrosion
heat treatment
