LOW DRIVING VOLTAGE Al-Ga SACRIFICIAL ANODE AND ITS ACTIVATION MECHANISM

J Chin Soc Corr Pro

2010, Vol. 30

Issue (4): 329-332 DOI:

Research Articles

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LOW DRIVING VOLTAGE Al-Ga SACRIFICIAL ANODE AND ITS ACTIVATION MECHANISM

MA Li^1,2,3, LI Weili⁴, ZENG Hongjie⁵, YAN Yonggui²,HOU Baorong¹

1. Institute of Oceanology,Chinese Academy of Sciences, Qingdao 266071
2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266071
3. Graduate University of Chinese Academy of Sciences, Beijing 100049
4. Department of Materials Science and Engineering, Nanjing University of Science and Technology,Nanjing 210094
5. Materials School, Beijing University of Science and Technology, Beijing 100083

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Abstract

The electrochemical performance of Al-Ga binary alloy with different Ga content were evaluated by constant current test. And the activation mechanism was investigated by X-Ray, SEM+EDS and redeposit experiment. The results showed that Al-0.07%Ga welded by high purity aluminum and Al-0.1%Ga welded by Al99.85 exhibit suitable working potential as low driving voltage sacrificial anode for cathodic protection of high strength steel. Their working potential was varied from -820 mV~-876 mV, -802 mV~-818 mV (vs. Ag/AgCl seawater) respectively. However, their performance needs to be improved for its serious local dissolution morphology. The Ga content of corrosion product was increasing with increasing of the Ga content of anode matrix, but the latter is far greater than the former. The content of Ga in anode surface is increasing for Ga³⁺ redeposit to the surface. The activation mechanism of Al-Ga anode obeys dissolution-redeposit mechanism.

Key words: Al-Ga alloy low driving voltage sacrificial anode electrochemical performance activation mechanism

Received: 10 June 2009

ZTFLH:

TG174.3

Corresponding Authors: HOU Baorong E-mail: brhou@ms.qdio.ac.cn

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Cite this article:

MA Li, LI Weili, ZENG Hongjie, YAN Yonggui,HOU Baorong. LOW DRIVING VOLTAGE Al-Ga SACRIFICIAL ANODE AND ITS ACTIVATION MECHANISM. J Chin Soc Corr Pro, 2010, 30(4): 329-332.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I4/329

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