Research Progress on Chromate Conversion Coating Properties
CHEN Mengyao1, LI Yan1, QI Jiantao2,
1 School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China 2 College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
Abstract: he chemical conversion coating is the most economical and effective surface treatment method for light alloy complex structural parts. Hexavalent chromium conversion coating is the most widely used and the most successful conversion coating process in the industry. However, the Cr6+ in the conversion coating is very harmful to the operator's health. The trivalent chromium conversion coating is the most promi-sing alternative due to its low toxicity and high corrosion resistance. Therecent studies have found that hexavalent chromium components (< 0.1at%) exist in trivalent chromium conversion coatings, and the distribution and content of Cr6+ components are closely related to the reaction solution, post-treatment methods and corrosive environment. It can be seen that the chemical properties of chromate conversion coating are mainly determined by their chromate valence and changes. In view of this, it is urgent to investigate the formation mechanism, concentration control and production conditions of the hexavalent chromium component in the coating. This paper briefly introduces the types, compositions, structures and coating forming conditions of chemical conversion coatings, discusses the self-repairing properties, formation process and structure of chromate conversion coatings, and the application status. The characterization of the hexavalent chromium component in the trivalent chromium conversion coating, the formation mechanism of the hexavalent chromium component in the coating and the control of the concentration and production conditions of the Cr6+ component are emphatically discussed, and summarizes and looks forward to the current and future research of chromate conversion coatings.
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2020, Vol. 34 
