Effect of Phytic Acid Conversion Film on Corrosion Resistance of Epoxy Varnish Coating

doi:10.11902/1005.4537.2017.052

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 265-273 DOI: 10.11902/1005.4537.2017.052

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Effect of Phytic Acid Conversion Film on Corrosion Resistance of Epoxy Varnish Coating

Liang CHANG, Chao SHI, Yawei SHAO(

), Yanqiu WANG, Bin LIU, Guozhe MENG

Corrosion and Protection Laboratory, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China

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Abstract

Effect of pretreatment of rust Q235 carbon steel with phytic acid solution on the corrosion resistance of epoxy coating was studied by means of electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and adhesion test. The results showed that this pretreatment process could enhanced the adhesion of the rust scale to the matrix, thereby enhance the adhesive strength and corrosion protectiveness on property of the epoxy coating obviously. Which might be attributed to that the phytic acid conversion film consisted of a dense inner layer and a loose outer layer rich in PO₄^3- and OH^- functional groups. This could improve the adhesion between the phytic acid conversion film and epoxy coating, therewith enhance the adhesion and corrosion protectiveness of the entired composite coating.

Key words: phytic acid conversion solution rusty paint epoxy coating corrosion protection

Received: 11 April 2017

ZTFLH:

TG174.46

Fund: Supported by National Key Research and Development Program of China (2016YFB0300604) and Fundamental Research Funds for the Central Universities (HEUCFZ1502)

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	Liang CHANG
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	Yawei SHAO
	Yanqiu WANG
	Bin LIU
	Guozhe MENG

Cite this article:

Liang CHANG, Chao SHI, Yawei SHAO, Yanqiu WANG, Bin LIU, Guozhe MENG. Effect of Phytic Acid Conversion Film on Corrosion Resistance of Epoxy Varnish Coating. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 265-273.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.052 OR https://www.jcscp.org/EN/Y2018/V38/I3/265

Fig.1 Adhesion strengths of EP coating on sand blasted and rust substrates after immersion for different time

Fig.2 Adhesion strengths of EP coating on sand blasted and rust steel, and PA/EP coating on rust steel after different immersion time

Fig.3 Bode (a, c) and phase angle (b, d) plots of EP (a, b) and PA/EP (c, d) coated rust steel after different immersion time

Fig.4 |Z |_{0.01 Hz} of the coatings as a function of immersion time

Fig.5 Equivalent electrical circuits of EIS of the coatings

Fig.6 Variations of the charge transfer resistances R_t of the coatings with immersion time

Fig.7 OCP of the coatings as a function of immersion time

Fig.8 Macroscopic corrosion morphologies of rust Q235 steel with the EP (a, b) and PA/EP (c, d) coatings after immersion in 3.5%NaCl solution for 9000 h (a, c) and then removing the coatings (b, d)

Fig.9 Microscopic corrosion morphologies of rust Q235 steel with EP (a, b) and PA/EP (c, d) coatings after immersion in 3.5%NaCl solution for 9000 h

Fig.10 FT-IR spectra of the rust layer and PA conversion layer of rust Q235 steel

Fig.11 SEM images of the cross sections of the rust layer (a) and PA conversion layer (b) of rust Q235 steel

Fig.12 Cross sections of the EP (a) and PA/EP (b) coatings on rust Q235 steel

Fig.13 Cross section (a) and corresponding EDS analysis results (b) of the PA conversion layer on rust Q235 steel

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