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夹杂物对316L不锈钢初期点蚀影响的数值模拟 预览

Numerical Simulation on Effect of Inclusions on Early Stage Pitting Corrosion of 316L Stainless Steel
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摘要 稀土元素的添加通常能改善不锈钢的耐腐蚀性能。为了研究稀土元素铈对316L不锈钢耐腐蚀性能的影响,基于扫描电镜(SEM)、动电位极化(PDP)试验,采用有限元方法研究了含不同分布形态夹杂物的316L不锈钢在质量分数为0.9%的NaCl溶液中的早期腐蚀行为。结果表明:添加铈后,316L不锈钢中夹杂物的形态由长条状转变为圆形。有限元模拟发现:当腐蚀初期不锈钢暴露在溶液中的阳极面积相等时,含长条状夹杂物的不锈钢相较于含圆形夹杂物的不锈钢的纵向点蚀速度更快,点蚀坑的尺寸更大,点蚀孔窄且深,更利于点蚀的发展。当不锈钢中夹杂物面积为定值时,夹杂物的近邻分布会加快纵向点蚀速度,增加点蚀坑的数量和尺寸,点蚀孔窄且深;夹杂物远邻分布时,点蚀孔宽且浅。 Addition of rare earth elements generally improves the corrosion resistance of stainless steel.In order to study the influence of rare earth element cerium on the corrosion resistance of 316 L stainless steel,based on the scanning electron microscopy(SEM) and potentiodynamic polarization(PDP) test,the finite element method(FEM) was used to investigate the effect of distribution and morphology of inclusions on the initial pitting corrosion behavior of 316 L stainless steel in 0.9% by mass NaCl solution.The results showed that the morphology of inclusions changed from lath-shaped to circular shape when Ce was added.The FEM results demonstrated that when the anode area of stainless steel exposed in solution was equal in the initial stage,the steel with lathshaped inclusions had a faster pitting rate in the longitudinal direction as compared to the steel with circular inclusions,so resulting in the formation of narrow and deep pitting holes with larger size,which was in favor of the development of pitting.When the area of inclusions in stainless steel was fixed,the gathered inclusions boosted the longitudinal pitting corrosion rate and increased the size and quantity of pitting holes which was narrow and deep.In contrast,the pitting holes in stainless steel with dispersed inclusions were wide and shallow.
作者 梁婉怡 胡丽娟 董海英 林保全 谢耀平 LIANG Wanyi;HU Lijuan;DONG Haiying;LIN Baoquan;XIE Yaoping(Institute of Materials Science,School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China;Laboratory for Microstructure,Shanghai University,Shanghai 200072,China)
出处 《上海金属》 CAS 北大核心 2019年第2期35-42,共8页 Shanghai Metals
基金 国家自然科学基金(No.51301102).
关键词 夹杂物 点蚀初期 316L不锈钢 有限元方法 inclusion initial pitting corrosion 316L stainless steel finite element method
作者简介 梁婉怡,女,从事金属材料腐蚀性能的仿真模拟研究,E-mail:shiloh6179@163.com;通信作者:胡丽娟,E-mail:lijuanhu@shu.edu.cn,电话:021-56337032。
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