Journal
SURFACE & COATINGS TECHNOLOGY
Volume 206, Issue 24, Pages 5072-5079Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.06.018
Keywords
Magnesium alloys; Anodic coatings; Electrolytes; Sodium silicate
Funding
- National Natural Science Foundation of China [51061007]
- Natural Science Foundation of Jiangxi Province, China [2010GZC0041]
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In a base solution containing 10 g/L sodium hydroxide and 12 g/L phytic acid, the influence of sodium silicate concentration on the formation and properties of anodic coatings obtained by micro arc oxidation (MAO) on magnesium alloys was systematically studied. The results demonstrate that sodium silicate can increase the solution conductivity, decrease the final voltage and change the coating color. Amorphous magnesium silicate is detected and the silicon content in the coatings continually increases with the increasing of sodium silicate concentration. Silicate ions can simultaneously combine with magnesium and aluminum ions to develop anodic coatings, while phytic acid radicals preferentially react with magnesium ions. Sodium silicate can further improve the corrosion resistance of MAO treated magnesium and the coating shows the best corrosion resistance in the base solution with 10 g/L sodium silicate. (C) 2012 Elsevier B.V. All rights reserved.
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