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| MECHANISM OF PITTING CORROSION ACTIVATION AND PASSIVATION OF Al-Zn-Sn-Ga ALLOY |
| LI Junfeng, WEN Jiuba, HE Junguang, MA Jingling, LI Gaolin |
| School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003 |
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Abstract The micro developed and passivated process of corrosion pits of Al-Zn-Sn-Ga alloy were investigated by SEM, and the function relationship between pH value and pits depth in corrosion pits was also calculated in order to explain the expanded and passivated mechanism of pitting corrosion under the condition of neutral NaCl solution. The result showed that pH value increased along with the expanding of the depth of corrosion pits. However in the range of 0~10-4 cm, the pH variation was minimal. The cathodic reaction, which could lead to passivation of corrosion pits, gradually became faster because of the activation of Ga amalgam. The passivation depth of corrosion pits was about 10-5 cm.
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Received: 10 October 2011
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Corresponding Authors:
LI Junfeng
E-mail: never-give-up-ljf@163.com
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