通过电化学方法测绘了不同稀土含量430铁素体不锈钢在35%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0037%~0043%时钢的耐蚀性能最好。
The polarization curves of 430 ferrite stainless steel with various RE contents in 3.5% NaCl neutral solutions are measured by electrochemical methods，The effect of rare earth on corrosion resistance of 430 ferrite stainless steel has been studied by the metallographic examination, SEM and electron spectroscopy. The results show that RE can effectively bate pitting corrosion, while the inclusions of MnS, Al2O3 and silicate in the shape of clump, chain or belt are transformed into tiny dispersive round or oval RE oxide and sulfide and their other compound inclusions. The data of electrochemistry experiment reveal that the optimal RE content is 0.037％ ～0043% for 430 ferrite stainless steel.
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