Numerical Simulation for Crevice Corrosion of 304 Stainless Steel in Sodium Chloride Solution  

作　　者：WANG Wei SUN Hu-yuan SUN Li-juan SONG Zu-wei ZANG Bei-ni 

机构地区：[1]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, P. R. China [2]Graduate University of Chinese Academy of Sciences, Beo＇ing 100049, P. R. China [3]Shandong Provincial Key laloratory of Corrosion Science, Qingdao 266071, P. R. China

出　　处：《Chemical Research in Chinese Universities》2010年第5期822-828,共7页高等学校化学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.40776044);the Knowledge Innovation Program ofChinese Acadenry of Sciences(No.KZCX2-YW-210)

摘　　要：The authors presented a mechanistic model describing the chemical reactions within a corroded thin, narrow crevice. In the mathematical model, a two-dimensional steady-state was used to predict the crevice pH profile by taking into account dissolved oxygen and hydrogen ions within the crevice. It consists of six parallel electrochemical reactions： multi anodic reactions（Fe, Cr, Ni dissolution reactions） and three cathodic reactions（the oxygen reduction, the hydrogen reaction and water dissociation）. Current density distribution and oxygen concentration distribution were determined to be corresponding to the evolution of potential distribution within the crevice. The contribution of each metal reaction to the overall corrosion process was in proportion to the mole fraction, and the simulation pro vided a good agreement with published experimental results for the crevice corrosion of stainless steel in sodium chloride solution.The authors presented a mechanistic model describing the chemical reactions within a corroded thin, narrow crevice. In the mathematical model, a two-dimensional steady-state was used to predict the crevice pH profile by taking into account dissolved oxygen and hydrogen ions within the crevice. It consists of six parallel electrochemical reactions： multi anodic reactions（Fe, Cr, Ni dissolution reactions） and three cathodic reactions（the oxygen reduction, the hydrogen reaction and water dissociation）. Current density distribution and oxygen concentration distribution were determined to be corresponding to the evolution of potential distribution within the crevice. The contribution of each metal reaction to the overall corrosion process was in proportion to the mole fraction, and the simulation pro vided a good agreement with published experimental results for the crevice corrosion of stainless steel in sodium chloride solution.

关 键 词：Crevice corrosion Finite element method（FEM） Current density pH Multi anodic reaction 

分 类 号：O141.4[理学—数学] TG142.71[理学—基础数学]