铸造技术2025，Vol.46Issue(6)：499-506,8.DOI:10.16410/j.issn1000-8365.2025.5118
铸造高硅双相不锈钢的点蚀性能研究
Study on the Pitting Corrosion Resistance of Cast High-silicon Duplex Stainless Steel
摘要
Abstract
Stainless steel has always been a focus of researchers because of its excellent adaptability in corrosive environments.A ferritic-austenitic high-silicon duplex stainless cast steel was designed.The pitting corrosion resistance of this stainless steel was characterized and analysed via methods such as microstructure observation,polarization curve determination and immersion corrosion tests to explore the formation and development mechanisms of pitting corrosion.The results demonstrate that the pitting corrosion resistance of high-silicon duplex stainless steel tends to decrease with the heat treatment processing,in the order of as-cast,solution-treated,tempered,and aged states.Pits primarily nucleate at the ferrite-austenite phase boundaries and tend to preferentially attack the austenite phase,forming a porous structure within the matrix.Ultimately,the surface layer sinks inwards or is corroded away,developing into collapse-style pit craters and cave-style pit holes.关键词
铸造高硅双相不锈钢/点蚀性能/点蚀机制Key words
high-silicon duplex stainless steel/pitting corrosion resistance/mechanism of pitting分类
矿业与冶金引用本文复制引用
唐奉平,陈祥..铸造高硅双相不锈钢的点蚀性能研究[J].铸造技术,2025,46(6):499-506,8.基金项目
内蒙古自治区科技计划项目(2023YFJM0004) （2023YFJM0004）
