铬酸盐转化膜性能的研究进展

doi:10.11896/cldb.19060012

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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.

Key words： conversion coating hexavalent chromium trivalent chromium chemical properties

Published: 17 November 2020

CLC number:

TG171

Fund:This work was financially supported by the National Natural Science Foundation of China (05E17040130, 51701239), and the Fundamental Research Funds for the Central Universities (18CX02128A).

About author:: Mengyao Chen received her B.E. degree from School of Materials Science and Engineering, China University of Petroleum (East China) in 2018. She is currently pursuing her master's degree at Materials Science and Engineering, China University of Petroleum (East China) under the supervision of Prof. Yan Li .
Jiantao Qi received his bachelor degree in the College of Chemical Engineering, China University of Petroleum (CUP, East China) in 2011 and the doctoral degree from Corrosion and Protection Centre, School of Mate-rials, University of Manchester in 2015. He has rich engineering and research experience as an independent postdoc researcher, competing the LATEST 2 project with Prof. George Thompson (OBE, RAE Fellow) at University of Manchester and the NEPAL FUI project in the PCS Lab (ENSCP-CNRS) with cooperation of Prof. Philippe Marcus. He started as a lecture in the CUP at June 2016 and was promoted to be a full associate professor and supervisor of master students at Dec. 2017. His research focuses on corrosion and protection of alloys, including surface modification, functional conversion coatings, physics and chemistry at the surface and interface, SERS Raman, XPS, RBS, electrochemical assessments and corrosion protection strategy.

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Cite this article:

CHEN Mengyao,LI Yan,QI Jiantao2. Research Progress on Chromate Conversion Coating Properties[J]. Materials Reports, 2020, 34(21): 21026-21032.

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http://www.mater-rep.com/EN/10.11896/cldb.19060012 OR http://www.mater-rep.com/EN/Y2020/V34/I21/21026

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