Effect of Alloying Tin on the Corrosion Characteristics of Austenitic Stainless Steel in Sulfuric Acid and Sodium Chloride Solutions  

作　　者：Min Sun Ming Luo Chao Lu Tian-Wei Liu Yan-Ping Wu Lai-Zhu Jiang Jin Li 

机构地区：[1]Department of Materials Science, Fudan University [2]Research and Development Center, Baosteel Co., Ltd. [3]Science and Technology on Surface Physics and Chemistry Laboratory

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第9期1089-1096,共8页金属学报（英文版）

基　　金：the China Postdoctoral Science Foundation (2013M541463);the National Natural Science Foundation of China (No. 51,131,008);the National Key Technology R&D Program (No. 2012BAE04B00);the Doctoral Fund of Ministry of Education of China (No. 20120071110013)

摘　　要：The effect of tin on general and pitting corrosion behaviors of the austenitic stainless steel in sulfuric acid and sodium chloride solutions was investigated by potentiostatic critical pitting temperature, cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy. The results showed that there is an optimal tin addition which is around （0.062-0.1） wt%, and the general corrosion resistance of B316LX with 0.08 wt% tin addition in boiling H2SO4 increased remarkably with a corrosion rate of an order of magnitude lower than that of 316L. Hydrolyzation of tin ions induces more metastable pit occurrence on the material surface. However, the pitting resistance of B316LX increases because tin oxides improve the density and uniformity of the passive film, and hydroxide and oxide of tin inhabit the process of pit growing. The effect of tin on pitting corrosion process is illustrated schematically.The effect of tin on general and pitting corrosion behaviors of the austenitic stainless steel in sulfuric acid and sodium chloride solutions was investigated by potentiostatic critical pitting temperature, cyclic potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electron microscopy. The results showed that there is an optimal tin addition which is around （0.062-0.1） wt%, and the general corrosion resistance of B316LX with 0.08 wt% tin addition in boiling H2SO4 increased remarkably with a corrosion rate of an order of magnitude lower than that of 316L. Hydrolyzation of tin ions induces more metastable pit occurrence on the material surface. However, the pitting resistance of B316LX increases because tin oxides improve the density and uniformity of the passive film, and hydroxide and oxide of tin inhabit the process of pit growing. The effect of tin on pitting corrosion process is illustrated schematically.

关 键 词：Stainless steel Corrosion resistance PASSIVATION Pitting corrosion 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG174.42[金属学及工艺—金属材料]