Anti-corrosion Performance of Nickel-rich Conductive Coatings in Simulated Seawater

doi:10.11902/1005.4537.2016.140

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 189-194 DOI: 10.11902/1005.4537.2016.140

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Anti-corrosion Performance of Nickel-rich Conductive Coatings in Simulated Seawater

Xinhua ZHANG¹,Zhongkang ZHOU¹,Qunjie XU²,Xiaochun CHEN¹,Aijun YAN³,Qiangqiang LIAO²(

),Honghua GE²

1 State Grid Anhui Electric Power Company Electric Power Research Institute, Hefei 230601, China
2 Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, China
3 China Datang Corporation Science and Technologic Research Institute Co., Ltd, Northwest Branch,Xi'an 710065, China

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Abstract

Conductive anticorrosion coatings were prepared with high viscosity acrylic resin as matrix, Ni- powder and defoamer etc. as additives, and then applied on 20# carbon steel. The electrical conductivity and the anti-corrosion performance in simulated seawater of the coatings with different Ni-powder content were characterized by means of surface contact resistance measurement, electrochemical impedance spectroscopy, and scanning electron microscopy respectively. Results show that with the increasing amount of Ni-powder, the electrical conductivity of the coatings increased. While, as the longer of the immersion time and the higher amount of the Ni-powder are, the lower of the capacitive reactance arc, the impedance, the phase angle and |Z |_0.05 of the coatings are. For a desired immersion time, the higher amount of the Ni-powder is, the faster decline of the capacitive reactance arc, the impedance, the phase angle and the |Z |_0.05 of the coatings is. According to Tafel polarization result, the higher amount of the Ni-powder is, the greater of the corrosion current of coatings is. It is concluded that with the higher amount of Ni-powder, the coatings exhibit better electrical conductivity, but the lower of the viscosity and worse corrosion resistance. A coating with about 20% Ni-powder possesses a comprehensive performance with better electrical conductivity and corrosion resistance.

Key words: conductive coating nickel powder electrical conductivity anti-corrosion performance

Received: 01 September 2016

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	Articles by authors
	Xinhua ZHANG
	Zhongkang ZHOU
	Qunjie XU
	Xiaochun CHEN
	Aijun YAN
	Qiangqiang LIAO
	Honghua GE

Cite this article:

Xinhua ZHANG,Zhongkang ZHOU,Qunjie XU,Xiaochun CHEN,Aijun YAN,Qiangqiang LIAO,Honghua GE. Anti-corrosion Performance of Nickel-rich Conductive Coatings in Simulated Seawater. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 189-194.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.140 OR https://www.jcscp.org/EN/Y2017/V37/I2/189

Fig.1 Relationship between the surface contact resistivity of the conductive coating and the mass fraction of nickel

Fig.2 Impendance module (a, c, e) and phase angle (b, d, f) plots of the different coatings after immersed in 3.5%NaCl solution for 2 d (a, b), 16 d (c, d) and 36 d (e, f)

Fig.3 Varieties of |Z |_0.05 of different coatings increasingwith immersed time

Fig.4 Tafel potentiodynamic polarization currves of different coatings

Table 1 Tafel results of coatings with different content of Ni in 3.5%NaCl solution

Fig.5 SEM images of coatings with 10% (a), 20% (b), 30% (c) and 40% (d) Ni after immersed in 3.5%NaCl solution for 40 d

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