Preparation and Anti-corrosion Properties of Waterborne Epoxy Coatings Containing Organic Microspheres

doi:10.11901/1005.3093.2016.215

Chinese Journal of Materials Research

2017, Vol. 31

Issue (1): 1-8 DOI: 10.11901/1005.3093.2016.215

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Preparation and Anti-corrosion Properties of Waterborne Epoxy Coatings Containing Organic Microspheres

Na WANG(

),Yinan ZHANG,Honghe LUAN,Jing ZHANG

School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Cite this article:

Na WANG,Yinan ZHANG,Honghe LUAN,Jing ZHANG. Preparation and Anti-corrosion Properties of Waterborne Epoxy Coatings Containing Organic Microspheres. Chinese Journal of Materials Research, 2017, 31(1): 1-8.

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Abstract

Mono-dispersed organic microspheres of polymethyl methacrylate (PMMA) and polystyrene (PS) were prepared via soap-free emulsion polymerization, and which then were blended with waterborne epoxy resin to prepared composite paint of organic microspheres / waterborne epoxy composite. Finally the composite coating was applied on the surface of steel sheet by air spraying method. The organic microspheres were characterized by dynamic light scattering (DLS) and scanning electron microscope (SEM). The anti-corrosion property of the composite coatings with different P/B ratio (the ratio of pigment to base material) was investigated by electrochemical impedance spectroscopy (EIS)、salt spray test and adhesion test. The results show that the coatings with P/B=0.007 has the best performance in anti-corrosion to salt spray and adhesion to the substrate. The composite coating has better corrosion resistance than that of the coating of blank waterborne epoxy resin because of that the addition of organic microspheres can enhance the denseness of the coatings.

Key words: materials failure and protection waterborne epoxy resin organic microsphere electrochemical impedance spectroscopy( EIS ) anti-corrosion

Received: 19 April 2016

Fund: Supported by Natural Science Foundation of Liaoning Province of China (No.2015021016), International Cooperation Program of Science and Technology Bureau of Shenyang, China (No.F15-200-6-01), Liao-ning Baiqianwan Talents Program

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	Na WANG
	Yinan ZHANG
	Honghe LUAN
	Jing ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.215 OR https://www.cjmr.org/EN/Y2017/V31/I1/1

Fig.1 Schematic representation of coating adhesion test

Fig.2 Organic microspheres morphology observed by SEM (a) PMMA organic microspheres, (b) PS organic microspheres

Fig.3 The organic microspheres particle-size distribution (a) PMMA organic microspheres, (b) PS organic microspheres

Fig.4 Nyquist diagrams of neat coating

Fig.5 Equivalent electrical circuits

Fig.6 Nyquist diagrams of the composite coatings pigmented with PMMA at different P/B (the ratio of pigment and base) (a: P/B=0.003 ; b: P/B=0.005;c: P/B=0.007; d: P/B=0.01)

Fig.7 Nyquist diagrams of the composite coatings pigmented with PS at different P/B (the ratio of pigmentand base) (a: P/B=0.003; b: P/B=0.005;c: P/B=0.007; d: P/B=0.01)

Fig.8 Time dependence of coating resistance

Fig.9 Mechanism of interaction between organic nano/microspheres and waterborne epoxy resin coating

Fig.10 Mechanism of anti-corrosion

Fig.11 Aspects of (a) epoxy; (b) PMMA P/B=0.003; (c) PMMA P/B=0.005; (d) PMMA P/B=0.007; (e) PMMA P/B=0.01; (f) PS P/B=0.003; (g) PS P/B=0.005; (h) PS P/B=0.007; (i) PS P/B=0.01 after exposure in salt spray for 600 h

Table 1 The data of coating adhesion test

Fig.12 Coating fracture morphology (A) 0.3%PMMA; (B) 0.5%PMMA; (C) 0.7%PMMA; (D) 1.0%PMMA; (E) 0.3%PS; (F) 0.5%PS; (G) 0.7%PS; (H) 1.0%PS; (I) epoxy

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