A numerical calculation method was developed for obtaining the corrosion product chemical distribution in galvanic corrosion of a zinc-coated iron substrate under atmospheric conditions. A one-dimensional (1D) model, in which the width of the solution was mathematically divided into minute elements, while the solution height (<i>h</i><sup>sol</sup>) perpendicular to the substrate surface was treated as a non-geometric variable, was applied to the developed calculation method. It was confirmed that time step could be larger when corrosion product formation was calculated based on Gibbs free energy changes of the reactions. The developed calculation method was validated by the qualitative agreements between measured and calculated results. In the measured and the calculated results, it was confirmed that the potential difference between Zn and Fe was larger and the corrosion products formed in lower Cl<sup>-</sup> concentration in stability diagram were formed in the lower NaCl concentration solutions. Since the developed calculation method is suitable for the calculations in which <i>h</i><sup>sol</sup> is thin and is variable and corrosion period is long, it is suitable for the calculations of atmospheric corrosion.
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Research Article|
June 26 2022
Development of Numerical Calculation Method of Formation of Corrosion Products in Galvanic Corrosion
Yuichi Watanabe;
Y Watanabe
JFE Techno Research Corporation Chiba Area
, Chiba, 260-0835, Japan
Correspondence: Yuichi Watanabe, Email: yuh-watanabe@jfe-tec.co.jp
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Sakae Fujita
Sakae Fujita
S Fujita
Hokkaido University
, Sapporo, Japan
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CORROSION 3875:.
Article history
Received:
May 17 2021
Revision Received:
June 23 2022
Accepted:
June 26 2022
Citation
Yuichi Watanabe, Sakae Fujita; Development of Numerical Calculation Method of Formation of Corrosion Products in Galvanic Corrosion. CORROSION 2022; 3875:. doi: https://doi.org/10.5006/3875
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