A High Adhesive Epoxy Varnish Coating on Galvanized Steel

doi:10.11902/1005.4537.2014.177

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (5): 455-460 DOI: 10.11902/1005.4537.2014.177

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A High Adhesive Epoxy Varnish Coating on Galvanized Steel

Bing ZHOU¹,Nan TANG²,Yingjun ZHANG¹,Liang MAO³,Yanqiu WANG¹,Yawei SHAO¹(

),Guozhe MENG¹

1. Corrosion and Protection Laboratory, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
2. State Grid Jiangxi Electric Power Research Institute, Nanchang 330077, China
3. Military Representative Office of Navy in Hudong-Zhonghua Shipbuilding Group, Shanghai 200129, China

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Abstract

Epoxy varnish coatings with different amount of sulfosalicylic acid were prepared on galvanized steel. The adhesion and corrosion performance of the coatings were characterized by means of pull-off adhesion tester and electrochemical impedance spectroscopy (EIS) respectively. While the effect of sulfosalicylic acid on the corrosion resistance of the coatings was also studied in 3.5%NaCl solution. The results show that with the increasing amount of sulfosalicylic acid, the adhesive strength of the coatings increases firstly, and then decreases. Among others, the coating with 3% (mass fraction) sulfosalicylic acid exhibits the highest adhesive strength, modules at low frequency and pore resistance during the immersion process only except for the initial stage; as well as the highest charge transfer resistance. These results show that the epoxy varnish coatings containing 3% sulfosalicylic acid has the best adhesion and corrosion resistance.

Key words: galvanized steel sulfosalicylic acid epoxy coating adhesion corrosion resistance

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	Bing ZHOU
	Nan TANG
	Yingjun ZHANG
	Liang MAO
	Yanqiu WANG
	Yawei SHAO
	Guozhe MENG

Cite this article:

Bing ZHOU, Nan TANG, Yingjun ZHANG, Liang MAO, Yanqiu WANG, Yawei SHAO, Guozhe MENG. A High Adhesive Epoxy Varnish Coating on Galvanized Steel. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 455-460.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.177 OR https://www.jcscp.org/EN/Y2015/V35/I5/455

Table 1 Formula of the epoxy coatings

Fig.1 Bode (a, c, e, g, i) and Nyquist (b, d, f, h, j) plots of samples with varnish (a, b), 1% (c, d), 2% (e, f), 3% (g, h) and 4% (i, j) coatings in 3.5%NaCl solution

Fig.2 |Z|_{f=0.01 Hz} as a function of immersion time for different samples in 3.5%NaCl solution

Fig.3 Equivalent circuits for fitting the experimental EIS date: (a) initial stage of the immersion, (b) middle stage of the immersion

Fig.4 Coatings pore resistance R_c (a) and charge-transfer resistance R_t (b) as a function of immersion time of samples in 3.5%NaCl solution

Fig.5 Adhesion of different coatings after immersion for different time

Fig.6 Bode plots of samples immersedin different corrosive solutions for 2 h (a) and 1172 h (b)

Table 2 |Z|_{f=0.01 Hz} of samples immersed in different corrosive solutions

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