Corrosion Resistance of Two Thermal Sprayed Zn-Al Alloy Coatings in Seawater at Low Temperatures

doi:10.11902/1005.4537.2015.188

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (5): 471-475 DOI: 10.11902/1005.4537.2015.188

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Corrosion Resistance of Two Thermal Sprayed Zn-Al Alloy Coatings in Seawater at Low Temperatures

Jiali SUI^1,²,Xiangbo LI²(

),Zhifeng LIN²,Tianrong ZHAN¹

1. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
2. State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266101, China

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Abstract

Zn-Al coatings with different Zn contents were prepared by thermal spray. The corrosion resistance of Zn-Al alloy coatings in seawater in temperature range of 0~25 ℃ was evaluated by scanning electron microscope (SEM), potentiodynamic polarization test and electrochemical impedance spectroscope. It was found that the surface of Al-85%Zn coating got darken than that of Al-2%Zn coating and lost metallic luster. As the temperature decreases, the corrosion potential of the coating shifted positively, while its corrosion current decreased and impedance (R_c) increased, leading to the increase in corrosion resistance of coating. In general, the corrosion resistance of Al-2%Zn coating is better than that of Al-85%Zn coating in low temperature seawater, and the stability of Al-2%Zn coating is also stronger.

Key words: thermal spraying Zn-Al alloy coating potentiodynamic polarization electrochemical impedance spectroscopy temperature

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	Jiali SUI
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Cite this article:

Jiali SUI,Xiangbo LI,Zhifeng LIN,Tianrong ZHAN. Corrosion Resistance of Two Thermal Sprayed Zn-Al Alloy Coatings in Seawater at Low Temperatures. Journal of Chinese Society for Corrosion and protection, 2016, 36(5): 471-475.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.188 OR https://www.jcscp.org/EN/Y2016/V36/I5/471

Fig.1 SEM images of the surfaces of Al-2%Zn coating (a) and Al-85%Zn coating (b)

Fig.2 SEM images of the cross sections of Al-2%Zn coating (a) and Al-85%Zn coating (b)

Fig.3 Potentiodynamic polarization curves of Al-2%Zn coating (a) and Al-85%Zn coating (b) in seawater at different temperatures

Fig.4 Variations of E_corr (a) and I_corr (b) of two Zn-Al alloy coatings in seawater with temperature

Fig.5 Nyquist plots of Al-2%Zn (a) and Al-85%Zn (b) coatings in seawater at different temperatures

Fig.6 Equivalent circuits of EIS of Al-2%Zn (a, b) and Al-85%Zn (c, d) coatings at initial stage (a, c) and last stage (b, d)

Fig.7 Variations of R_c of two Zn-Al coatings with temperature

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