稀土铈对9Cr1 Mo钢组织及电化学腐蚀性能的影响

摘要

制备了稀土铈质量分数分别为0,0．0020％,0．0160％的9Cr1Mo钢,采用扫描电镜、能谱分析仪以及电化学工作站等研究了稀土铈对9Cr1Mo钢显微组织及在3．5％(质量分数)NaCl 溶液中电化学腐蚀性能的影响.结果表明：稀土铈可以细化试验钢晶粒,减小马氏体片层间距以及晶界和晶内析出相的数量,提高试验钢的电化学腐蚀性能；含稀土铈质量分数为0．0020％的试验钢具有最佳的耐腐蚀性能.%9Cr1Mo steels containing different contents of rare earth Ce(its mass fraction is 0,0.002 0% and 0.016 0%)were prepared,and then the effects of Ce on microstructure and electrochemical corrosion properties (in 35wt% NaCl solution)of the steels were studied by scaning electron microscope,energy dispersive spectrometer and electrochemical workstation.The results show that Ce can reduce the size of grains,martensite layer interval and number of precipitated phase in the grain and at grain boundaries, and improve corrosion resistance of experimental steels.When the mass faction was 0.002 0%,the experimental steel had the best corrosion resistance.