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Improvement of Corrosion Resistances of Organosilane-Epoxy Coating on Al Alloy 6101 with Addition of Zinc Phosphate Pigment

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Abstract

The organosilane-epoxy coating material is used for metal protection against corrosion as it has strong adhesion property on a metal substrate due to its multi coordinate sites. In the present paper, the corrosion resistance of organosilane-epoxy coating was improved by the addition of a zinc phosphate pigment. As compared to the pure organosilane-epoxy coating on Al alloy 6101, the mechanical property and electrochemical impedance spectroscopy studies on the organosilane-epoxy coating with addition of a zinc phosphate pigment at a concentration 0.6 wt % show that the modified coatings on Al alloy 6101 have stronger peeling off force than the pure coating on Al alloy 6101, which is increased by 55%. The corrosion protection efficiency of the zinc phosphate pigment modified coating is enhanced by at least 98% comprehensively, in an alkaline solution of NaOH with pH 11, via all tests including mass loss, potentiodynamic polarization, and electrochemical impedance spectroscopy. Scanning electron microscope and X-ray energy dispersive spectroscopy mapping show a good dispersed distribution of the zinc pigment in the coating.

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Funding

This research has been funded by Shaanxi Province Key Research Fund under the grant number 2019GY-157 and by the Wisteria Scientific Research Cooperation Special Project of Northwest University, China.

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Authors and Affiliations

  1. Institute for Energy Transmission Technology and Application, School of Chemical Engineering, Northwest University, 710069, Xi’an, China

    Ahsan Riaz Khan & Maosheng Zheng

  2. China Railway Baoji Track Electrical Equipment Inspection Co., Ltd., 721000, Baoji, China

    Ying Cui & Hongwu Zhang

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  1. Ahsan Riaz Khan
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  2. Maosheng Zheng
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  4. Hongwu Zhang
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Correspondence to Maosheng Zheng.

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Ahsan Riaz Khan, Zheng, M., Cui, Y. et al. Improvement of Corrosion Resistances of Organosilane-Epoxy Coating on Al Alloy 6101 with Addition of Zinc Phosphate Pigment. Surf. Engin. Appl.Electrochem. 58, 720–730 (2022). https://doi.org/10.3103/S1068375522060096

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