Corrosion Behavior of Al-Zn-Si-RE Alloy Powder Containing Water-borne Coating on Carbon Steel in 3.5%NaCl Solution

doi:10.11902/1005.4537.2014.183

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (5): 429-437 DOI: 10.11902/1005.4537.2014.183

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Corrosion Behavior of Al-Zn-Si-RE Alloy Powder Containing Water-borne Coating on Carbon Steel in 3.5%NaCl Solution

Qiong JIANG^1,²,Qiang MIAO²(

),Wenping LIANG²,Zhimei LIU²,Ke WANG²,Zhengjun YAO²,Xiaoxin WEI³

1. School of Materials Engineering, Yancheng Insitute of Technology, Yancheng 224051, China
2. College of Material Science & Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
3. Jiangsu Linlong New Materials Co., Ltd., Wuxi 214183, China

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Abstract

The microstructure and corrosion performance in 3.5%NaCl solution of an Al-Zn-Si-RE containing water-borne coating were investigated by means of SEM with EDS as well as potentiodynamic polarization curves and electrochemical EIS. The results indicate that Al-Zn-Si-RE coating shows a typical lamellar structure, which significantly increases the length of diffusion path for corrosive species; and an excellent coating uniformity in micro scale, which may be beneficial to its protectiveness. The corrosion process of Al-Zn-Si-RE coating can be divided into four stages during immersion in 3.5%NaCl solution: I) the active corrosion of Al-Zn-Si-RE flakes on the surface layer; II) the coverage of Al-Zn-Si-RE flakes by the corrosion product layer thereby decreasing their dissolution; III) the temporary sacrificial anode protection of the coating for the steel substrate when the electrolyte reached the interface coating/substrate; IV) the barrier protection caused by corrosion products. Therefore, the protection mechanism of the coating is physical barrier combined with a weak sacrificial anode protection.

Key words: Al-Zn-Si-RE coating composition uniformity polarization plot electrochemical impedance spectroscopy corrosion behavior

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	Qiong JIANG
	Qiang MIAO
	Wenping LIANG
	Zhimei LIU
	Ke WANG
	Zhengjun YAO
	Xiaoxin WEI

Cite this article:

Qiong JIANG, Qiang MIAO, Wenping LIANG, Zhimei LIU, Ke WANG, Zhengjun YAO, Xiaoxin WEI. Corrosion Behavior of Al-Zn-Si-RE Alloy Powder Containing Water-borne Coating on Carbon Steel in 3.5%NaCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 429-437.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.183 OR https://www.jcscp.org/EN/Y2015/V35/I5/429

Fig.1 Cross-sectional morphology of Al-Zn-Si-RE coating

Fig.2 SEM image (a) of Al-Zn-Si-RE coating and distribution maps of Al (b), Zn (c) and Si (d)

Fig.3 Polarization curves of Al-Zn-Si-RE coating, Zn-Al coating and Q235 steel after immersion in 3.5%NaCl solution for 2 h

Table 1 Electrochemical parameters obtained from polarization curves of three materials after immersion in 3.5%NaCl solution for 2 h

Fig.4 Nyquist (a1~d1) and Bode (a2~d2) plots for Al-Zn-Si-RE coating after immersion in 3.5%NaCl solution during corrosion stage I (a1, a2), II (b1, b2), III (c1, c2) and IV (d1, d2)

Fig.5 Equivalent circuits for Al-Zn-Si-RE coating after immersion in 3.5%NaCl solution during corrosion stage I (a), II (b), III (c) and IV (d)

Fig.6 Fitting results of Nyquist (a) and Bode (b, c) plots for Al-Zn-Si-RE coatings immersed for different time

Fig.7 Evolutions of the active dissolution resistance R_p of metal powers and film resistance R_f on the surface of metal flake with time at the second corrosion stage in 3.5%NaCl solution

Fig.8 Evolutions of the charge transfer resistance R_ctwith time at the third corrosion stage in 3.5% NaCl solution

Fig.9 Surface morphologies of Al-Zn-Si-RE coating after immersing in 3.5%NaCl solution for 20 d (a), 75 d (b), 100 d (c), 120 d (d) and 180 d (e)

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