Journal
SURFACE & COATINGS TECHNOLOGY
Volume 375, Issue -, Pages 621-636Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2019.07.034
Keywords
Plasma electrolytic oxidation; CP-Ti; Titanium dioxide layer; Hardness/adhesion; Corrosion resistance; Microstructure; Incorporation of P
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Phosphorus-incorporated oxide layers were grown on commercially pure titanium during plasma electrolytic oxidation in sodium dihydrogen phosphate dihydrate solution. Microstructure, mechanical and electrochemical behavior of the surface oxides indicated a dominant anatase and rutile structure of TiO2 with nanocrystallites ranging from 45 to 64 nm and 48-98 rim, respectively as well as Ti2+, Ti3+ and Ti4+ chemical species. Using a combination of process time, applied current and electrolyte concentration, coating thicknesses up to about 10 gm were fabricated. Best mechanical performance was observed for potentiostatic deposited samples yielding a 453 HV 300 hardness, 19 N adhesive failure and 38 N full delamination resistance. All PEO-coated samples in this work exhibit a corrosion current density with one order of magnitude lower than CP-Ti when subjected to Ringer's physiological solution.
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