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In the present paper, new coatings enriched in copper ions obtained on niobium by Plasma Electrolytic Oxidation in electrolyte containing concentrated phosphoric acid H3PO4 with copper nitrate Cu(NO3)2, are presented. It has been shown that it is possible to obtain the coatings with copper ions inside during the PEO treatment. The highest copper amount (4.05 wt. % | 1.75 at. %) was detected after oxidation at 450 V in electrolyte containing 300 g Cu(NO3)2, while the lowest copper amount (1.95 wt. % | 0.97 at. %) was detected after oxidation at 180 V in electrolyte containing 150 g Cu(NO3)2. The highest copper to phosphorus ratio (0.23 wt. % | 0.11 at. %) was detected after oxidation at 450 V in both electrolytes, i.e. that containing 150 g as well as 300 g Cu(NO3)2 in 500 ml H3PO4.The lowest copper to phosphorus ratio (0.15-0.17 wt. % | 0.07-0.09 at. %) was detected after oxidation at 180 V in both electrolytes, i.e. that containing 150 g as well as 300 g Cu(NO3)2 in 500 ml H3PO4. In addition, it was found that the higher the PEO potential used (here 450 V), the higher copper to phosphorus ratio gained.

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