Morphology and Corrosion Properties of Hydroxyapatite Coating on VT6 Titanium Alloy

The formation of hydroxyapatite coating on BT6 titanium alloy under the combined treatment: nitriding and plasma-electrolytic oxidation in an alkaline electrolyte (hydroxyapatite + 1M potassium hydroxide) was investigated. Such treatment promotes the growth of the Ca 10 (PO 4 ) 6 (OH) 2 hydroxyapatite phase, that can be attributed to an increase of the centers of hydroxyapatite crystallization on the pre-nitrided surface. The hydroxyapatite coating on pre-nitrided surface provided higher hydrophilicity and better corrosion resistance in Ringer’s solution at a temperature of 37°C.