Formation of Protective Coatings by Microarc Oxidation Using Aluminum and Calcium Hydroxide Nanopowders

摘要

The elemental composition and the morphology of ceramic-like microarc oxidation (MAO) coatings on a zirconium alloy are studied. The coatings are prepared by MAO in electrolytes with addition of aluminum and calcium hydroxide nanopowders. The electrolyte with aluminum hydroxide nanopowder enables preparation of relatively thick (up to 90 μm) and dense coatings composed of both zirconium oxide and oxides of other elements contained in the electrolyte. The electrolyte with calcium hydroxide nanopowder yields thinner MAO coatings that almost completely consist of zirconium oxide.