Alternative conversion coatings to chromate for the protection of magnesium alloys |
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| Affiliation: | 1. Faculty of Polymer Engineering & Color Technology, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;2. Color and Polymer Research Center, Amirkabir University of Technology, P.O. Box 15875-4413, Tehran, Iran;1. Surface Engineering Division, CSIR National Aerospace Laboratories, Post Bag No. 1779, Bangalore 560017, Karnataka, India;2. Department of Chemistry, National Institute of Technology, Kerala 673601, India;1. Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, 5988 Renmin Street, Changchun 130025, China;2. Key Laboratory of Bionic Engineering, Ministry of Education, 5988 Renmin Street, Changchun 130025, China |
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| Abstract: | Chromium Conversion Coatings (CCCs) are widely used for the protection of magnesium alloys against the corrosion but this approach is limited due to the toxicity of hexavalent chromium. Alternative conversion coatings are based on solutions containing chromium (III), permanganate, phosphates, Rare Earth Elements (REEs) or vanadium. This review details the deposition and protection mechanisms of CCC technology and other promising processes. Permanganate/phosphate-based coating presents a corrosion resistance equivalent to CCC and REEs have self-healing properties but no coating present all the properties of CCCs. The development of new non-toxic conversion coatings remains a priority. |
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| Keywords: | A Magnesium C Oxidation B cyclic voltammetry C Oxides coatings |
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