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通过电化学方法测绘了不同稀土含量430铁素体不锈钢在3.5%中性氯化钠溶液中的极化曲线,采用金相、扫描电镜和能谱等分析手段,研究了微量稀土对430铁素体不锈钢耐蚀性的影响。研究结果表明:稀土通过将MnS、Al2O3以及硅酸盐类等块状、链状及条带状夹杂物变质为细小弥散的圆形或椭圆形稀土硫氧化物及其复合夹杂物,有效地抑制了点蚀的发生。电化学试验数据显示:稀土含量0.037%~0.043%时钢的耐蚀性能最好。
The polarization curve of 430 ferrite stainless steel with different RE content in 3.5% neutral sodium chloride solution was plotted by electrochemical method. The effects of trace rare earth on the ferrite content of 430 ferrite Body stainless steel corrosion resistance. The results show that the rare earth can be effectively restrained by modifying the massive, chained and banded inclusions such as MnS, Al2O3 and silicate into finely dispersed circular or oval rare earth sulfur oxides and their composite inclusions The occurrence of pitting. Electrochemical test data show: the corrosion resistance of steel is the best when the content of rare earth is 0.037% ~ 0.043%.