MICROSTRUCTURE AND CORROSION RESISTANCE OF WATERBORNE Al-Zn-Si ALLOY COATING

J Chin Soc Corr Pro

2012, Vol. 32

Issue (4): 311-316 DOI:

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MICROSTRUCTURE AND CORROSION RESISTANCE OF WATERBORNE Al-Zn-Si ALLOY COATING

JIANG Qiong¹, MIAO Qiang¹, YAO Zhengjun¹, WEI Xiaoxin²

1. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106
2. Jiangsu Linlong New Materials Co. Ltd, Wuxi 214183

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Abstract A kind of anti-corrosive paint consisted of epoxy silane and lamellar Al-Zn-Si alloy particles was introduced in this paper. Corrosion properties of waterborne Al-Zn-Si alloy coating were tested through salt water immersion method, electrochemical method. Furthermore, the microstructure, corrosion products of the coating were detected by means of SEM, EDS and XRD. The experimental results showed that Al-Zn-Si alloy particles dispersed in coating in the form of flake structure which formed a more effective physical shield, extending the path of the corrosive medium to body; furthermore, in the corrosion processes corrosion product film formed which filled in pores of the coating and had good shielding property; Tafel curves indicated that Al-Zn-Si alloy was a good sacrificial anode material of aluminum. In addition, anti-corrosive mechanism of Al-Zn-Si alloy coating was analyzed which possessed excellent cathodic protection, and its excellent corrosion resistance was related to lamellar Al-Zn-Si alloy powder which had lower dissolution rate, inhibited the corrosion of the coating and prolonged the duration of cathodic protection.

Key words: Al-Zn-Si alloy coating corrosion protective coatings salt water corrosion cathodic protection

Received: 28 June 2011

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JIANG Qiong, MIAO Qiang, YAO Zhengjun, WEI Xiaoxin. MICROSTRUCTURE AND CORROSION RESISTANCE OF WATERBORNE Al-Zn-Si ALLOY COATING. J Chin Soc Corr Pro, 2012, 32(4): 311-316.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2012/V32/I4/311

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