Protective coatings formation by micro-arc oxidation with the use of nanopowders of Al and Ca hydroxides
Elemental composition and morphology of ceramic-likes MAO coatings on Zr alloy produced by micro- arc oxidation in electrolytes with addition of nanopowders of Al and Ca hydroxide compounds have been investigated. In electrolyte with Al hydroxide addition, the thick (up to 90 mm) and dense MAO-coatings are formed composed of ZrO2 phase and oxides of other elements which there are in electrolyte, whereas more thin and composed only of ZrO2 phase MAO-coatings are formed in electrolyte with Ca hydroxide additive.