摘要
利用电化学方法和表面分析技术研究了 3 0 4不锈钢在硝酸盐及硫酸溶液中的钝化行为 .结果表明 ,3 0 4不锈钢经硝酸盐及硫酸溶液中钝化后在 3 5%NaCl溶液中的耐蚀性大为提高 .SEM分析表明 ,经过H2 SO4 +KNO3 钝化后 ,钝化膜具有网状的结构 ,膜层结合紧密 ;而单独在H2 SO4 溶液中钝化后 ,表面为有裂纹的钝化膜 ,微孔较多 ;单独在KNO3 溶液中钝化 。
The passivation behavior of 304stainless steel by sulfuric acid and nitrate was studied by electrochemical methods and scanning electron microscopy (SEM).The experimental results showed that the corrosion resistance in 3.5%NaCl solution increased greatly for the 304SS treated by KNO 3 and H 2SO 4 solution.Whilst when the steel was treated in a solution containing only H 2SO 4,its corrosion resistance decreased,and the corrosion resistance for 304SS treated in KNO 3 solution didn't change very much.SEM observation results showed that the surface became smoother when treated by H 2SO 4 and KNO 3,the passive films adhered to the substrate with reticulate like structure.While the passive films showed a lot of cracks,and large amount of pine holes,when the steel was treated in H 2SO 4 solution.The surface of the steel treated by KNO 3 was similar to the untreated ones.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2003年第6期334-336,368,共4页
Corrosion Science and Protection Technology
