Preparation and Anticorrosion Performance of Conductive Epoxy Resin Based Composite Coatings

doi:10.11901/1005.3093.2014.158

Chinese Journal of Materials Research

2014, Vol. 28

Issue (11): 835-841 DOI: 10.11901/1005.3093.2014.158

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Preparation and Anticorrosion Performance of Conductive Epoxy Resin Based Composite Coatings

Shinian LIU¹,Cheng WANG^2,^*(

),Shengping FAN¹,Guohua LU¹,Fuhui WANG²

1. Electric Power Research Institute of Guangdong Power Grid Corporation, Guangzhou 510080
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

Cite this article:

Shinian LIU,Cheng WANG,Shengping FAN,Guohua LU,Fuhui WANG. Preparation and Anticorrosion Performance of Conductive Epoxy Resin Based Composite Coatings. Chinese Journal of Materials Research, 2014, 28(11): 835-841.

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Abstract

Conductive epoxy resin based composite coatings were prepared by physical blending process and then applied onto on Q235 carbon steel surface. The results show that there existed lots of micro-blisters in the pure E51 epoxy coating without pigments, which deteriorate the protectiveness of the coatings. In the contrast, the quantity of the micro-blisters of the conductive composite coatings was decreased greatly by adding pigments. The test results of immersion in 3%NaCl solution and salt spray indicated a superior corrosion resistance of the composite coatings. After corrosion test, no bubbling or pickling for the composite coatings could be observed and no corrosion was detected for Q235 carbon steel underneath the coatings. Electrochemical experiments revealed that the impendence of the E51 coating decreased fast, while that of the composite coatings increased with the immersion time in 3.5%NaCl solution. The composite coatings have 'self-healing' ability. The electric resistance and adhesion strength of the composite coatings are in the order of 10³ Ωcm and 9.12 MPa respectively.

Key words: metalic materials materials failure and protection anticorrosion conductive Q235 steel epoxy resin

Received: 03 April 2014

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	Shinian LIU
	Cheng WANG
	Shengping FAN
	Guohua LU
	Fuhui WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.158 OR https://www.cjmr.org/EN/Y2014/V28/I11/835

Table 1 Nominal composition of Q235 carbon steel (mass fraction, %)

Table 2 Compositions of the composite coatings (mass fraction, %)

Fig.1 EIS for E51 lacquer (a-c) and composite coatings (d-f)

Fig.2 Relationship between corrosion potential and immersion time

Fig.3 Equivalent circuits for Q235 steel coated with epoxy coatings

Fig.4 Relationship between coating resistance and immersion time

Fig.5 Relationship between f_b and immersion time

Fig.6 Morphologies of E51 lacquer coatings. Pristine (a); salt spray test for 2000 h (b); corrosion in 3%NaCl solution for 2000 h (c)

Fig.7 SEM morphologies of E51 compound coatings. Pristine (a, b), salt spray exposed for 2000 h (c, d), corrosion in 3%NaCl solution for 2000 h (e, f)

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