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Coatings 2018, 8(5), 180; https://doi.org/10.3390/coatings8050180

Fabrication of Poly(o/m-Toluidine)–SiC/Zinc Bilayer Coatings and Evaluation of Their Corrosion Resistances

1,2
,
1,2,* , 1,2
and
1,2
1
School of Metallurgy, Northeastern University, Shenyang 110819, China
2
Liaoning Key Laboratory for Metallurgical Sensor and Technology, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Received: 1 April 2018 / Revised: 2 May 2018 / Accepted: 5 May 2018 / Published: 9 May 2018
(This article belongs to the Special Issue Polymer Thin Films)
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Abstract

The purpose of this research was to study the structure and corrosion resistance of poly(o/m-toluidine)-SiC/zinc (Zn) bilayer coatings. Poly(o/m-toluidine) films, such as poly(o-toluidine) (POT) and poly(m-toluidine) (PMT), were chemically deposited on the surface of composite SiC/Zn coating using the solution evaporation method. The structures of poly(o/m-toluidine) were characterized by various optic techniques and the electrochemical behavior was studied by cyclic voltammetry (CV). The structures and morphologies of the SiC/Zn coating were detected by Fourier transformation infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy dispersive spectrometer (EDS), and scanning electron microscopy (SEM). Thereafter, the corrosion resistances of electrodeposited and bilayer coatings were investigated in 3.5% NaCl solution by electrochemical corrosion techniques and an accelerated immersion test. The results showed that the outer POT film exhibits a lower corrosion behavior with respect to PMT, which significantly reduces the corrosion rate of SiC/Zn coating and prolongs the service life of the zinc matrix. The conclusion demontrates that the stronger adsorptive POT film ensures the formed POT–SiC/Zn bilayer coatings possess a compact and low-defect surface, which facilitates POT film to develop its excellent barrier and passivation properties against corrosion. View Full-Text
Keywords: poly(o/m-toluidine); SiC/zinc; corrosion resistance; barrier; passivation poly(o/m-toluidine); SiC/zinc; corrosion resistance; barrier; passivation
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Hu, C.; Li, Y.; Zhang, J.; Huang, W. Fabrication of Poly(o/m-Toluidine)–SiC/Zinc Bilayer Coatings and Evaluation of Their Corrosion Resistances. Coatings 2018, 8, 180.

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