Resistance to H₂S Uniform Corrosion of ZG25CrNiMo after LPC RE Modification

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.