Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper
Krzysztof Rokosz, Tadeusz Hryniewicz, Kornel Pietrzak, Łukasz Dudek
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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