不锈钢点蚀花边盖脱落与稳定生长-《郑州大学学报(工学版)》

文章信息/Info

作者:: 孙道明; 蒋益明; 高娟; 等.; 复旦大学,材料科学系,上海,200433, 复旦大学,材料科学系,上海,200433, 复旦大学,材料科学系,上海,200433, 复旦大学,材料科学系,上海,200433, 复旦大学,材料科学系,上海,200433, 复旦大学,材料科学系,上海,200433

Author(s):: SUN Daoming; JIANG Yiming; GAO Juan; etc; Department of Materials Science，Fudan University，Shanghai 200433，China

摘要:: 不锈钢在含Cl-的溶液中常萌生表面呈多孔花边盖状(Lacy cover)蚀孔,在花边盖下的蚀坑内表面隐藏着不断侵蚀,这种有趣的点蚀常加剧材料的失效.采用精细316 ss微电极面积调控形成单一点蚀孔来研究点蚀,获得其点蚀发展的动力学数据,根据Fick扩散定律可知点蚀稳定生长条件为蚀坑内电流密度(i)与深度(a)之积存在一个点蚀稳定范围.并用新的超声电解池证实花边盖对亚稳态点蚀的生长的作用.

Abstract:: Stainless steel often germinates in Cl-containing solutions with porous lacy cover etched holes, and continuous erosion is hidden on the inner surface of the pit under the lace cover, which is an interesting pitting corrosion that often aggravates the failure of the material. Fine 316 ss microelectrode area regulation was used to form a single pitting hole to study pitting corrosion, and the kinetic data of pitting corrosion development were obtained, and according to Fick’s diffusion law, it can be seen that the stable growth condition of pitting corrosion is the product of current density (i) and depth (a) in the pit. The effect of lace cover on the growth of metastable pitting was confirmed by a new ultrasonic electrolytic cell.