Influence of Silane Coupling Agent Modified Zinc Phosphate on Anticorrosion Property of Epoxy Coating

doi:10.11902/1005.4537.2019.040

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 38-44 DOI: 10.11902/1005.4537.2019.040

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Influence of Silane Coupling Agent Modified Zinc Phosphate on Anticorrosion Property of Epoxy Coating

SHI Chao^1,²,SHAO Yawei²(

),XIONG Yi¹,LIU Guangming¹,YU Yuelong¹,YANG Zhiguang¹,XU Chuanqin¹

1. College of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
2. Materials Science and Chemical Engineering College, Harbin Engineering University, Harbin 150001, China

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Abstract

The submicron-sheet zinc phosphate (SZP) was modified with silane coupling agent (KH560), and then the modified zinc phosphate (KH560-SZP) was characterized by FT-IR, SEM and EDS. Dispersion statuses of SZP and KH560-SZP, as pigments in epoxy coating were comparatively analyzed by SEM. Then, corrosion resistance of epoxy coatings with SZP and KH560-SZP respectively were assessed via EIS, adhesion test and surface morphology observation. The results showed that KH560-SZP, as a pigment coated with cross-linking silane polymer could be dispersed effectively into the epoxy resins. Thus, the barrier performances and adhesion of the coatings were significantly improved. Consequentially, the anti-corrosion performance of the coating was comprehensively improved because due to the addition of the silane coupling agent modified zinc phosphate.

Key words: silane coupling agent modified zinc phosphate epoxy coating corrosion resistance interfacial state

Received: 25 March 2019

ZTFLH:

TG174.46

Fund: National Key R&D Program of China(2016YFB0300604);International S&T Cooperation Program of China(2014DFR50560);Scientific Research Foundation for Doctor(EA201901056)

Corresponding Authors: Yawei SHAO E-mail: shaoyawei@hrbeu.edu.cn

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	Chao SHI
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Cite this article:

SHI Chao,SHAO Yawei,XIONG Yi,LIU Guangming,YU Yuelong,YANG Zhiguang,XU Chuanqin. Influence of Silane Coupling Agent Modified Zinc Phosphate on Anticorrosion Property of Epoxy Coating. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 38-44.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.040 OR https://www.jcscp.org/EN/Y2020/V40/I1/38

Fig.1 FT-IR spectra of SZP and KH560-SZP pigments

Fig. 2 Micro-morphologies (a, c) and EDS results (b, d) of SZP (a, b) and KH560-SZP pigments (c, d)

Table 1 Contents of main elements in SZP pigment and KH560-SZP pigment (atomic fraction / %)

Fig.3 Dispersion statuses of SZP (a) and KH560-SZP (b) pigments in the resin substrates of the coatings

Fig.4 Equivalent electrical circuits of the coating/steel system after immersion for different time: (a) one time constant, (b) two time constants with Warburg impedance, (c) two time constants without Warburg impedance

Fig.5 Bode (a, b) and Nyquist (c, d) plots of the resin coatings with SZP (a, c) and KH560-SZP (b, d) after immersion for different time

Fig.6 Variations of R_c of SZP coating and KH560-SZP coating with immersion time

Fig.7 Variations of R_t of SZP coating and KH560-SZP coating with immersion time

Fig.8 Adhesion strengths of SZP coating and KH560-SZP coating after immersion for different time

Fig.9 Macroscopic surface morphologies of SZP (a, b) and KH560-SZP (c, d) coatings after 700 h immersion (a, c) and pull-off test (b, d)

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