LPC稀土改性ZG25CrNiMo后耐H_2S均匀腐蚀性能

Resistance to H_2S Uniform Corrosion of ZG25CrNiMo after LPC RE Modification

设计了不同含量镧镨铈(LPC)稀土的25CrNiMo铸钢,采用失重法测定了试样在H2S环境中的平均腐蚀速率;并用金相显微镜对铸态试样的腐蚀产物进行了观察分析,结合XPS方法研究了加入稀土前后热处理态试样的腐蚀产物膜表面各元素的化学状态。结果表明,加入LPC稀土的铸态和热处理态试样都达到耐蚀级别,LPC稀土能改变表面铁原子的聚集状态,对25CrNiMo铸钢的确有提高耐蚀性作用。

The average corrosion rates of 25CrNiMo cast steel samples containing different amounts of La-Pr-Ce （LPC） rare earth were measured by weight loss method in H2S environment. The corrosion products of the cast sample were analyzed by metallopgraphic microscopy, combined with XPS method study of the chemical elements states of the corrosion products of the heat-treated materials before and after the adding of rare earth. The results show that the samples in both as cast and as heat treated conditions reached the anti-corrosion grade when LPC rare earth was added. LPC rare earth can change the aggregation state of surface Fe atoms and improve the anti-corrosion ability of 25CrNiMo cast steel.