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Plasma electrolytic oxidation (PEO) coatings were formed on Zr-1Nb alloy in electrolyte containing 9 g/L sodium silicate, 5 g/L sodium hypophosphite, and 6 g/L submicron yttrium oxide powder at current densities 20, 30, and 40 A/dm 2 . The coatings surface morphology was studied by scanning electron microscope. The electrochemical behavior of coated and uncoated samples was investigated after 1-and 7-days exposure in 10 % HCl. The samples with PEO coatings formed at 30 A/dm 2  current density had the best corrosion protective properties after 1-day exposure in 10 % HCl. After 7-days exposure in 10 % HCl the samples with PEO coatings formed at 30 and 40 A/dm 2  current densities showed greater corrosion resistance then samples with PEO coatings formed at 20 A/dm 2  current density and uncoated samples.

Electrochemical study of Zr-1Nb alloy with oxide coatings formed by plasma electrolytic oxidation