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| STOCHASTIC ANALYSIS OF THE MAGNETIC FIELD INFLUENCE ON THE PITTING MECHANISM OF PURE MAGNESIUM |
| LI Jian1; ZHANG Tao1;2; MENG Guozhe1;2; SHAO Yawei1;2;WANG Fuhui1;2 |
1. College of Materials Sciences and Chemical Engineering; Harbin Engineering University; Harbin 150001
2. State Key Laboratory for Corrosion and Protection; Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016 |
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Abstract Stochastic analysis was applied to the investigation of the influence of the presence of the magnetic field on the pitting mechanism of pure magnesium, in which pitting corrosion was simulated as the combination of two physical processes: pit initiation and pit growth. The result revealed that the magnetic field could strongly affect the ions in the electrolyte by the magnetohydrodynamics (MHD) phenomena. For the pit initiation process, the mechanism of pit initiation was changed by the presence of magnetic field from the parallel birth and death stochastic model (B1) to the parallel birth stochastic model (A3). The pit generation rate $\lambda$ was increased while the repassivation rate μ was decreased, which indicated that magnetic field accelerated the pit initiation process of pure magnesium. For the pit growth process, the stable pit growth mechanism was not changed, but the ability of repassivation of pit corrosion was decreased resulting in a great probability for the stable pit corrosion to grow up with a higher growth rate and finally develop into larger pit cavity.
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Received: 26 September 2008
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Corresponding Authors:
ZHANG Tao
E-mail: zhangtao@hrbeu.edu.cn
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