Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (5): 822-828.

• Articles • Previous Articles     Next Articles

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

WANG Wei1,2,3, SUN Hu-yuan1,2*, SUN Li-juan1,3, SONG Zu-wei1,2,3 and ZANG Bei-ni1,2,3   

  1. 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, P. R. China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;
    3. Shandong Provincial Key Ialoratory of Corrosion Science, Qingdao 266071, P. R. China
  • Received:2009-10-20 Revised:2010-03-22 Online:2010-09-25 Published:2010-11-26
  • Contact: SUN Hu-yuan. E-mail: sun@ms.qdio.ac.cn
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.40776044) and the Knowledge Innovation Program of Chinese Acadenry of Sciences(No.KZCX2-YW-210).

Abstract: 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 provided a good agreement with published experimental results for the crevice corrosion of stainless steel in sodium chloride solution.

Key words: Crevice corrosion, Finite element method(FEM), Current density, pH, Multi anodic reaction