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冶炼了不同稀土Ce含量的204Cu不锈钢,进行650℃下保温2 h的敏化处理。采用能谱分析和化学浸蚀等方法研究了不同含量的稀土Ce对204Cu不锈钢耐晶间腐蚀性的影响。结果表明:向钢中加入稀土Ce可使晶界处的Cr含量提高,改善耐晶间腐蚀性能,降低腐蚀沟槽宽度。当Ce含量高于0.029%时,试样的耐晶间腐蚀性降低。向钢中加入0.029%的稀土Ce可使204Cu不锈钢获得最佳的耐晶间腐蚀性。
204Cu stainless steel with different rare earth Ce contents was smelted and sensitized at 650 ℃ for 2 h. The effects of different contents of Ce on the intergranular corrosion resistance of 204Cu stainless steel were studied by means of energy spectrum analysis and chemical etching. The results show that adding rare earth Ce into the steel can increase the Cr content in the grain boundary, improve the intergranular corrosion resistance and reduce the width of the corrosion groove. When the Ce content is higher than 0.029%, the intergranular corrosion resistance of the sample decreases. Adding 0.029% rare earth Ce to the steel gives the best resistance to intergranular corrosion of 204Cu stainless steel.