Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper release_umtlvo3zujf7zlgd2nonzw4e2e

Abstract

In the present paper, the analysis of SEM and EDS results of porous and enriched in calcium, magnesium, zinc, copper and phosphorus coatings, obtained during 3-minute treatments performed by Plasma Electrolytic Oxidation (PEO)/Micro Arc Oxidation (MAO) processes on CP Titanium Grade 2, is presented. The PEO process was carried out at DC potentials of 500 V DC , 575 V DC, and 650 V DC in electrolytes containing 125 g Ca(NO 3) 2 ·4H 2 O, and 125 g Mg(NO 3) 2 •6H 2 O, and 125 g Zn(NO 3) 2 •6H 2 O, and 125 g Cu(NO 3) 2 •3H 2 O in 1 L H 3 PO 4. It was found that obtained coatings have pores with different shapes and diameters and/or size/dimentions. The Ca/P, Mg/P, Zn/P, Cu/P, and M/P ratios (M=Ca+Mg+Zn+Cu) were equal to 0.074, 0.046, 0.056, 0.042, and 0.218, respectively. The highest value of each of these ratios was recorded for 650 V DC. It may be concluded that the obtained PEO coatings structures most likely are similar to hydroxyapatite-like structures, in which the Ca 2+ may be replaced with Zn 2+ , Mg 2+ , Cu 2+ .
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