含氮马氏体不锈轴承钢的耐腐蚀性能

Corrosion resistance of nitrogen-containing martensitic stainless bearing steel

研究了含氮马氏体不锈轴承钢在盐雾腐蚀环境中的腐蚀行为,并与9Cr18不锈轴承钢进行了对比。结果表明,含氮马氏体不锈轴承钢比9Cr18不锈轴承钢有更好的耐腐蚀性能。与9Cr18不锈轴承钢相比,含氮马氏体不锈轴承钢在盐雾环境中的腐蚀形态以点蚀为主。腐蚀面积随着腐蚀时间的延长没有显著增大,当腐蚀时间达到120 h时,腐蚀面积比仅为0.44%。含氮马氏体不锈轴承钢的平均腐蚀率和腐蚀深度分别为0.026 g·m-2·h-1和2.3μm,比9Cr18不锈钢分别降低了60.6%和66.2%。含氮马氏体不锈轴承钢中尺寸细小、分布均匀的碳化物对于提高其耐腐蚀性能有重要作用。

The corrosion resistance of a nitrogen-containing martensitic stainless bearing steel was investigated under neutral salt spray compared with the conventional 9Cr18 stainless bearing steel. The results indicate that the corrosion resistance of the nitrogen-containing martensitic stainless bearing steel is much better than that of the 9Cr18 steel. Compared with 9Cr18 steel, the pit corrosion is the major corrosion morphology for the nitrogen-containing martensitic stainless bearing steel in salt fog condition. The corrosion area with the extension of the corrosion time does not increase significantly, and when the corrosion time reaches to 120 h, the corrosion area ratio is only 0.44%. The average corrosion area ratio and corrosion depth of nitrogen-containing martensitic stainless bearing steel are 0. 026 g · m^- 2 · h^-1 and 2.3 μm, which are reduced by 60.6% and 66.2% compared to 9Cr18 steel. Small gain size and uniform distribution of carbon compounds play an important role to improve the corrosion resistance of nitrogen-containing martensitic stainless bearing steel.