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Journal of Coatings Technology and Research

, Volume 16, Issue 1, pp 1–13 | Cite as

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

  • Zhiqiang Gao
  • Dawei ZhangEmail author
  • Zhiyong Liu
  • Xiaogang Li
  • Sheming Jiang
  • Qifu Zhang
Article
  • 142 Downloads

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.

Keywords

Corrosion Conversion coating Zinc Molybdate Phosphate Vanadate 

Notes

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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Copyright information

© American Coatings Association 2018

Authors and Affiliations

  1. 1.Corrosion and Protection CenterUniversity of Science and Technology BeijingBeijingChina
  2. 2.National Engineering Laboratory of Advanced Coating Technology for MetalsCentral Iron and Steel Research InstituteBeijingChina

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