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Formation mechanisms of environmentally acceptable chemical conversion coatings for zinc: a review

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Abstract

Eco-friendly conversion treatments have attracted a great interest for corrosion protection of Zn-based materials. Considerable work has been undertaken on the development of advanced conversion coatings. However, the complete range of formation mechanisms of these coatings is not fully understood. Comprehensive understanding of the mechanisms of coating formation, from coating methodologies to fundamentals, is lacking. This review covers recent research that has led to advances in formation mechanisms of environmentally acceptable conversion coatings for zinc, including the thermodynamic stability of chemical systems, the illumination of intermediate reactions, the characterization of the element compositions of coatings, and the deduction for the formation mechanisms of coatings. Representative surface treatment techniques, including phosphate coating, molybdate coating, rare earth coating, vanadate coating, IV(B) metal coating, and silane coating, are discussed in detail. Finally, focused on the strategies used to develop new technologies of conversion treatments, discussions on future trends and perspectives of clever design solutions and advanced analytical methods for formation processes will be given finally.

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Acknowledgments

This work is funded by the National Engineering Laboratory of Advanced Coating Technology for Metals, Central Iron & Steel Research Institute, Beijing, China.

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Authors and Affiliations

  1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing, China

    Zhiqiang Gao, Dawei Zhang, Zhiyong Liu & Xiaogang Li

  2. National Engineering Laboratory of Advanced Coating Technology for Metals, Central Iron and Steel Research Institute, Beijing, China

    Zhiqiang Gao, Sheming Jiang & Qifu Zhang

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  1. Zhiqiang Gao
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  2. Dawei Zhang
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  3. Zhiyong Liu
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  4. Xiaogang Li
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  5. Sheming Jiang
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Correspondence to Dawei Zhang.

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Gao, Z., Zhang, D., Liu, Z. et al. Formation mechanisms of environmentally acceptable chemical conversion coatings for zinc: a review. J Coat Technol Res 16, 1–13 (2019). https://doi.org/10.1007/s11998-018-0076-1

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