title: Electrolytic A12O3 coating on co-cr-mo implant alloys of hip prosthesis.
abstract: The ceramic films over metallic implant surfaces have the potential to improve implant performance with respect to implant fixation, wear, or corrosion. In this study, the electrolytic Al2O3 coatings on F-1537 Co-Cr-Mo alloy were conducted in an aqueous solution of Al(NO3)3. Through the cycle polarization test in Hank's solution, it was found that the corrosion potential and protection potential of the alumina-coated were higher than that of the uncoated, and the corrosion current density was lower. The phase transformation of A12O3 film on Co-Cr-Mo alloy annealed at 800 K revealed todlite (5Al2O3 . H2O) and thetaAl2O3 (113) preferred orientation for 20 min, and thetaAl2O3 (200) preferred orientation with eta phase for 80 min. Scanning electron microscopy/energy dispersive spectroscopy observations after the scratch tests showed that the adhesion of the alumina films on Co-Cr-Mo alloy can load a stress over the yield strength (450 MPa) of Co-Cr-Mo alloy. The wear loss of ultra-high molecular-weight polyethylene to the Al2O3-coated specimen was eight times less than that to the uncoated. It is concluded that such Al2O3-coated films on Co-Cr-Mo implant alloy exhibit excellent quality in corrosion, adhesion, and wear for the application of hip prosthesis.
authors.affiliation: Institute of Materials Engineering, National Chung Hsing University, Taichung, Taiwan. skyen@dragon.nchu.edu.tw
authors.forename: S K
authors.initials: SK
authors.lastname: Yen
authors.forename: S W
authors.initials: SW
authors.lastname: Hsu
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003343:Corrosion; D003460:Crystallization; D019544:Equipment Failure Analysis; D006622:Hip Prosthesis; D008855:Microscopy, Electron, Scanning; D011095:Polyethylenes; D000267:Tissue Adhesions; D014800:Vitallium / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D020099:Coated Materials, Biocompatible; D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D014800:Vitallium; D000537:Aluminum Oxide