Abstract The influence of rare earth addition on the mechanism of localised corrosion induced by inclusions in Zr-Ti deoxidised steel was investigated in a simulated marine environment. Inclusion size and composition changed after rare earth addition, profoundly affecting the localised corrosion. Current sensing atomic force microscopy results showed that no galvanic couple formed between inclusions and matrix owing to the insulating property of different inclusions. Matrix dissolution resulting from the microcrevices and lattice distortion surrounding ZrO2-Ti2O3-Al2O3 inclusions initiated localised corrosion in Zr-Ti deoxidised steel. After adding RE, localised corrosion was induced by dissolution of the (RE)2O2S-(RE)xSy part of the inclusion.

中文翻译：

---

稀土金属对Zr-Ti脱氧低合金钢夹杂物局部腐蚀机制的影响

摘要 在模拟海洋环境中研究了稀土添加对Zr-Ti脱氧钢中夹杂物引起的局部腐蚀机制的影响。添加稀土后，夹杂物的大小和成分发生了变化，深刻影响了局部腐蚀。电流传感原子力显微镜结果表明，由于不同夹杂物的绝缘性，夹杂物与基体之间没有形成电偶。由围绕 ZrO2-Ti2O3-Al2O3 夹杂物的微裂缝和晶格畸变引起的基体溶解引发了 Zr-Ti 脱氧钢的局部腐蚀。添加稀土后，由于夹杂物的 (RE)2O2S-(RE)xSy 部分的溶解，引起了局部腐蚀。