Self-repairing oxides to protect zinc: Review,discussion and prospects |
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| Affiliation: | 1. CSIRO Material Science and Engineering, Clayton, 3169 Victoria, Australia;2. ARC Centre of Excellence for Design in Light Metals, Department of Materials Engineering, Monash University, Clayton, 3800 Victoria, Australia;1. Institut CARNOT de Bourgogne, UMR 5209 CNRS-Université de Bourgogne, BP 47 870, 21 078 Dijon, France;2. ArcelorMittal Research SA, 57283 Maizières-lès-Metz, France;3. Laboratoire de Physico-Chimie des Surfaces, UMR 7045 CNRS-ENSCP, 11 rue Pierre et Marie Curie, 75 005 Paris, France;1. Chimie ParisTech, PSL University, CNRS, Institut de Recherche Chimie Paris (IRCP), F-75005 Paris, France;2. School of Materials Science and Engineering, Sichuan University of Science & Engineering, 643000 Zigong, China;3. Department of Chemistry, Western University, London, ON N6A 5B7, Canada;4. Sorbonne Université, Laboratoire Interfaces et Systèmes Electrochimiques, LISE, F-75005 Paris, France;5. Faculty of Science, Engineering and Built Environment, Deakin University, Waurn Ponds, VIC 3216, Australia |
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| Abstract: | Zinc is protected in the short term by chromate conversion coatings. The Cr (VI) based surface layer has the unique ability to self-repair which is attributable to the aqueous properties of its constituent ions. The thermodynamic feasibility of achieving chromium-like protection for the short term using other candidates is reviewed. Long-term protection of zinc is naturally affected by its own corrosion products (patina), which form a multilayered structure. The role of this patina in protecting the underlying metal is also reviewed, and processes within the patina, including the interaction between its various layers, are elaborated and discussed. |
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