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Corrosion Resistance of Bis-Silane-Modified Epoxy Coatings on an Al-Zn-Mg-Cu Alloy

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Abstract

A bis-silane prepolymer-modified epoxy coating was applied to an Al-Zn-Mg-Cu alloy to improve corrosion protection. The bis-silane prepolymer was synthesized from tetraethoxysilane and γ-glycidoxypropyl trimethoxysilane. To study the mechanism of protection failure by the silane–epoxy hybrid coating and to determine an appropriate coating for protection, various coatings with different silane prepolymer contents were developed. The corrosion behavior of the coatings was studied by electrochemical impedance spectroscopy in a 3.5 wt.% NaCl solution. In comparison with silane monomer-modified epoxy coatings, the bis-silane-modified epoxy coating had lower coating capacitance (Cc), higher charge transfer resistance (Rdl) and lower double-layer capacitance (Cdl) during long immersion times, indicating a higher resistance to water permeation and stronger protection against substrate corrosion. The lowest Cc and Cdl values were obtained by mixing epoxy and the bis-silane prepolymer at a ratio of 1:1.

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Acknowledgments

The authors are grateful for financial support from the National Key Research and Development Program of China (2016YFB0300900), the National Key Fundamental Research Project of China (2012CB619506-3), Natural Science Foundation of China (51171209), 2011 Program of Ministry of Education of China.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University, Changsha, 410083, China

    Diping Zeng, Zhiyi Liu, Song Bai, Juangang Zhao & Jian Wang

  2. Department of Mechanical and Energy Engineering, Shaoyang University, Shaoyang, 422000, China

    Diping Zeng

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Zeng, D., Liu, Z., Bai, S. et al. Corrosion Resistance of Bis-Silane-Modified Epoxy Coatings on an Al-Zn-Mg-Cu Alloy. J. of Materi Eng and Perform 29, 5282–5290 (2020). https://doi.org/10.1007/s11665-020-05049-5

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