不锈钢凭借在腐蚀环境中的优秀适应力，受到研究者的持续关注。设计了一种含铁素体和奥氏体的铸造高 硅双相不锈钢材料，利用显微组织观察、极化曲线测定和浸泡腐蚀实验等方法对不锈钢的点蚀性能进行了表征分析，探 讨了点蚀的形成和发展机制。结果表明，铸造高硅双相不锈钢的点蚀性能根据热处理工艺的不同，按照铸态、固溶态、回 火态、时效态的顺序呈下降趋势，蚀孔主要从铁素体和奥氏体相界开始形成，有向奥氏体相腐蚀的倾向，在基体内形成 疏松结构，最终表面层向内凹陷或被腐蚀，发展为塌陷式点蚀坑和洞穴式点蚀坑。

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.