Effect of PSS-PEDOT Surface-modified Zn Particles on Anticorrosion Performance of Acrylic Resin Coating

doi:10.11901/1005.3093.2019.205

Chinese Journal of Materials Research

2019, Vol. 33

Issue (10): 776-784 DOI: 10.11901/1005.3093.2019.205

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Effect of PSS-PEDOT Surface-modified Zn Particles on Anticorrosion Performance of Acrylic Resin Coating

XU Long^1,²,LIU Fuchun^1,^2,³(

),HAN En-Hou^1,^2,³

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China
3. Shenyang Zhongke Engineering Technology Center for Corrosion Control, Shenyang 110016, China

Cite this article:

XU Long,LIU Fuchun,HAN En-Hou. Effect of PSS-PEDOT Surface-modified Zn Particles on Anticorrosion Performance of Acrylic Resin Coating. Chinese Journal of Materials Research, 2019, 33(10): 776-784.

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Abstract

Zn particles were surface modified with polystyrene sodium sulfonate doped poly3, 4-ethylene dioxythiophene (PSS-PEDOT). The corrosion performance of the as modified Zn powder was investigated by means of immersion test in 3.5%NaCl (mass fraction) solution and scanning electron microscope, of which the corrosion current density was found one order of magnitude smaller than that of the blank Zn powder. Then, the anticorrosion performance of the coating composed of acrylic resin incorporated with the modified Zn powder was characterized by means of salt spray test and electrochemical impedance spectroscope. It follows that less corrosion of Zn particles on the coating surface was observed and the cathodic protection duration of the coating was prolonged by 20% in contrast with the one incorporated with blank Zn powder. The increased corrosion resistance of Zn particles and enhanced electrical connections that decreased the Zn reactivity was proposed as the possible mechanism of the improved anticorrosion performance of the coating incorporated with modified Zn powder.

Key words: material failure and protection cold galvanizing coating EIS surface modification conductive polymer

Received: 20 April 2019

ZTFLH:

TQ630

Fund: Science and Technology Planning Project of Shenyang(Y17-1-039)

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	Long XU
	Fuchun LIU
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https://www.cjmr.org/EN/10.11901/1005.3093.2019.205 OR https://www.cjmr.org/EN/Y2019/V33/I10/776

Fig.1 Micrographs and EDS analysis of zinc powders (a) unmodified and (b) modified with PEDOT: PSS

Fig.2 (a, b) digital photos and (c, d) SEM images of zinc particles (a, c) unmodified and (b, d) modified with PEDOT: PSS after 5 d immersion in 3.5% NaCl solution

Fig.3 SVET results of the coatings with (a) unmodified and (b) modified zinc powders after 0.5 h immersion in 3.5% NaCl solution

Fig.4 Digital photos and micrographs of the samples after 2000 h salt spray test, (a) and (d) digital photos of samples, (b) and (c) top view and cross sectional view of sample without modification, (e) and (f) top view and cross sectional view of sample modified with PEDOT: PSS

Fig.5 Variations of corrosion potentials of the coatings during immersion in 3.5% NaCl solution

Fig.6 Nyquist and Bode plots of (a) the unmodified zinc coating and (b) modified zinc coating after immersion for different time in 3.5% NaCl solution

Fig.7 Equivalent circuits used for simulation, R_s: resistance of solution, C_c: coating capacitance, R_c: coating resistance, R_t: reaction resistance of zinc, C_dl: double layer capacitance

Fig.8 Evolutions of the fitted values of various electrochemical parameters (a) coating resistance, (b) coating capacitance, (c) reaction resistance of zinc, (d) double layer capacitance

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