Boundary Element Method (BEM) Analysis for Galvanic Corrosion of Hot Dip Galvanized Steel Immersed in Seawater

J Mater Sci Technol ›› 2009, Vol. 25 ›› Issue (02): 194-198.

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Boundary Element Method (BEM) Analysis for Galvanic Corrosion of Hot Dip Galvanized Steel Immersed in Seawater

Xiao Tang¹⁾, Yuzhi Zhang^1,2), Meng Liu^1,2) and Yan Li^1)†

1) Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
2) Graduate School of Chinese Academy of Sciences, Beijing 100039, China

Received:2007-11-22 Revised:2008-04-27 Online:2009-03-28 Published:2009-10-10
Contact: Yan LI
Supported by:
National Natural Science Foundation of China (Grant No. 40576038), and Doctoral Foundation of Department of Science
Technology of Shandong Province, China (Grant No. 2006BS07008)

Abstract

Abstract:

A numerical analysis of galvanic corrosion of hot-dip galvanized steel immersed in seawater was presented. The analysis was based on the boundary element methods (BEMs) coupled with Newton-Raphson iterative technique to treat the nonlinear boundary conditions, which were determined by the experimental polarization curves. Results showed that galvanic current density concentrates on the boundary of steel substrate and zinc coating, and the sacrificial protection of zinc coating to steel substrate results in overprotection of steel cathode. Not only oxygen reduction but also hydrogen reduction could occur as cathode reactions, which probably led up to the adsorption and absorption of hydrogen atoms. Flat galvanized steel tensile sample shows a brittle behavior similar to hydrogen embrittlement according to the SSRT (show strain rate test) in seawater.

Key words: Galvanic corrosion, BEM, Hydrogen absorption, Potential distribution, Current density distribution

Xiao Tang,Yuzhi Zhang,Meng Liu,Yan Li. Boundary Element Method (BEM) Analysis for Galvanic Corrosion of Hot Dip Galvanized Steel Immersed in Seawater[J]. J Mater Sci Technol, 2009, 25(02): 194-198.

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Boundary Element Method (BEM) Analysis for Galvanic Corrosion of Hot Dip Galvanized Steel Immersed in Seawater

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