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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 behavior of stainless steel bearing martensitic stainless steel in salt spray environment was studied and compared with 9Cr18 stainless steel. The results show that the stainless steel bearing martensitic stainless steel bearing 9Cr18 better corrosion resistance. Compared with 9Cr18 stainless steel bearing, the corrosion morphology of stainless steel bearing martensitic stainless steel in salt spray environment is dominated by pitting corrosion. The corrosion area did not increase significantly with the extension of the etching time. When the etching time reached 120 h, the corrosion area ratio was only 0.44%. The average corrosion rate and corrosion depth of the stainless steel bearing martensitic stainless steel are 0.026 g · m-2 · h-1 and 2.3 μm, respectively, which are 60.6% and 66.2% lower than those of 9Cr18 stainless steel respectively. Nitrogen-containing martensitic stainless steel bearing small size, uniform distribution of carbide for improving its corrosion resistance plays an important role.