MO_x-ZrO_2 Coatings with M=Al, Mg, Zr, Ti, and Nb on Valve Metals

摘要

Coatings formed on aluminum, titanium, magnesium, zirconium, and niobium by means of plasma-electrolytic oxidation in an aqueous electrolyte containing MgZrF are studied. All elements involved in the composition of the complex compound are present in the coatings. Contents of the elements involved in the inner sphere are the largest. Phase and elementary compositions of the coatings depend on the nature of the valve metal. All coatings contain ZrO_2 in either cubic or monoclinic modifications. The main phase of the coatings formed on magnesium is MgF_2. According to the surface structure, the coatings can be divided into three groups: large-pore (on Mg, Al, and Ti), small-pore (on Nb), and compact with a wavy surface (on Zr).