EVOLUTION MECHANISM OF PITTING OF Al CLAD 7075 AND 2024 ALUMINIUM ALLOY IN COASTAL ENVIRONMENT

J Chin Soc Corr Pro

2012, Vol. 32

Issue (3): 195-202 DOI:

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EVOLUTION MECHANISM OF PITTING OF Al CLAD 7075 AND 2024 ALUMINIUM ALLOY IN COASTAL ENVIRONMENT

SUN Shuangqing¹, ZHAO Yubing², ZHENG Qifei³, LI Defu³

1. Key Laboratory of New Energy Physics & Materials Science in University of Shandong, Faculty of Science, China University of Petroleum, Dongying, Shandong 257061
2. Department of Petroleum Refining Engineering Construction, PetroChina, Beijing 100028
3. General Research Institute for Nonferrous Metals, Beijing 100088

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Abstract Evolution mechanism of pitting of Al clad 7075 and 2024 aluminium alloy in coastal environment was investigated by long-term field testing and laboratory-accelerated test. Corrosion morphologies, elemental distribution and corrosion potential were observed and analyzed by SEM, EDS and electrochemical analysis system. The result of EDS spectrum showed that the outer cladding layer only revealed the presence of Al and Zn, while the inner cladding layer still showed certain Mg content besides Al and Zn. A small quantity of Mg enhanced corrosion resistance of the inner cladding layer, which results that the cladding has not been penetrated by pitting after 20 years exposure in coastal environment. Moreover, the shape of those pits in coastal environment was wide and shallow in field testing and laboratory-accelerated test.

Key words: high-strength aluminum atmospheric corrosion coastal environment pitting corrosion

Received: 07 November 2011

ZTFLH:

TG172.3

Corresponding Authors: SUN Shuangqing E-mail: sqsu@yahoo.cn

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SUN Shuangqing, ZHAO Yubing, ZHENG Qifei, LI Defu. EVOLUTION MECHANISM OF PITTING OF Al CLAD 7075 AND 2024 ALUMINIUM ALLOY IN COASTAL ENVIRONMENT. J Chin Soc Corr Pro, 2012, 32(3): 195-202.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I3/195

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