论文部分内容阅读
采用金相显微镜、扫描电子显微镜、电化学试验研究了不同热处理工艺下船用奥氏体不锈钢022Cr17Ni12Mo2的微观组织和均匀腐蚀性能。结果表明,随着固溶温度的升高,钢的平均晶粒度变大;腐蚀率则随固溶温度的升高先降低后增加,在固溶温度为1090℃时,腐蚀率最小。随着固溶温度的增加,试样表面由粗糙、不规则形状突起、表面成膜状况差等逐渐形成致密平整的保护膜。固溶温度为1090℃时,试样表面的腐蚀膜覆盖范围、致密性和均匀性最好。
The microstructure and uniform corrosion of 022Cr17Ni12Mo2 austenitic stainless steel for ship under different heat treatment processes were studied by means of metallographic microscope, scanning electron microscope and electrochemical test. The results show that the average grain size of steel increases with the increase of solution temperature. The corrosion rate decreases with the increase of solution temperature and then increases. When the solution temperature is 1090 ℃, the corrosion rate is the smallest. With the increase of the solution temperature, the surface of the sample is formed by the rough and irregularly shaped protrusions, the poor film-forming conditions on the surface, and the dense and flat protective film. When the solution temperature is 1090 ℃, the coverage area of the corrosion film on the sample surface is the best in terms of compactness and uniformity.