PITTING CORROSION OF HIGH STRENGTH ALUMINUM ALLOYS IN SALT SPRAY TEST

J Chin Soc Corr Pro

2010, Vol. 30

Issue (3): 197-202 DOI:

Research Articles

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PITTING CORROSION OF HIGH STRENGTH ALUMINUM ALLOYS IN SALT SPRAY TEST

CUI Jihong^1,2, CAI Jianping², JIA Chengchang¹

1. School of Materials Science and Engineering, University of Science &Technology Beijing, Beijing 100083
2. Beijing Institute of Aeronautical Materials, Beijing 100095

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Abstract

Salt fog spray test is used to accelerate the corrosion of 7B04 aluminum alloy. The pitting corrosion of this alloy was investigated by using metallographic method and localized electrochemical impedance spectroscopy (LEIS). It was concluded that the corrosion rate of the alloy increased sharply, but was retarded at the middle stage of exposure. The maximum depth of the pitting was linearly growing in the whole process. The pitting mechanism was mainly attributed to the dissolving the surrounding matrix of cathode-phase particles, dissolving aluminum itself or secondary pitting of Cu particles which is the corrosion residues. While the cathode phase of AlCu or AlCuMg second-phase particles was the main initiation cause. Localized electrochemical impedance spectroscopy (LEIS) which is suitable to follow changes in the dissolution kinetics during pit growth, could provide valuable information on the changes of the impedance on a small area.

Key words: pitting corrosion aluminum alloy salt spray test localized electrochemical impedance spectroscopy(LEIS) maximum pit depth

Received: 20 February 2009

ZTFLH:

TG172.3

Corresponding Authors: CAI Jianping E-mail: jpcai2001@yahoo.com.cn

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Cite this article:

CUI Jihong, CAI Jianping, JIA Chengchang. PITTING CORROSION OF HIGH STRENGTH ALUMINUM ALLOYS IN SALT SPRAY TEST. J Chin Soc Corr Pro, 2010, 30(3): 197-202.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I3/197

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