Plasma-Electrolytic Formation of Ta-Containing Oxide Coatings on Titanium--Their Composition and Properties

摘要

Coatings with a thickness of 2-18 μm that contain up to 20 at % tantalum and Ta_2O_5 oxide phase are formed in an aqueous NH_4[TaF_6]-containing electrolyte for 2 min. The coatings are pierced with pores with a size of from 0.5 to 2 um. The number of pores in the coatings can be decreased by additionally applying a Ta-containing paste to the surface. The contact angle of the coatings in distilled water is 68°-85°. This approach is promising for application of Ta-containing coatings on titanium implants and stents for increasing their corrosion resistance, chemical inertness, and biocompatibility.