Electrolytic Al2O3 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.

Synergism between corrosion and wear on CoCrMo−Al2O3 biocomposites in a physiological solution

“…CoCrMo alloys are being widely used for load-bearing and articulating orthopedic implants owing to their good balance in strength, fatigue, wear, and corrosion resistance [1][2][3][4][5]. However, as articulating implants are under tribological contact surrounded corrosive body fluids, the material degradation can be enhanced by the simultaneous action of wear and corrosion [6].…”

Mechanical and tribological behavior of silicon nitride and silicon carbon nitride coatings for total joint replacements

“…Different surface treatments and coatings have been investigated for the bearing surfaces between the femoral head and the acetabular cup in hip implants, such as TiN (Harman et al, 1997;Pappas et al, 1995;Teresa Raimondi and Pietrabissa, 2000), diamond-like carbon (Affatato et al, 2000;Fisher et al, 2002;Lappalainen et al, 1998), CrN (Fisher et al, (2002), CrCN (Fisher et al, 2002), ZrO 2 , and Al 2 O 3 (Yen and Hsu, 2001). However, insufficient adhesion and coating artifacts, such as droplets, have been reported as major concerns for these coatings.…”

Electrochemical investigation of chromium nanocarbide coated Ti–6Al–4V and Co–Cr–Mo alloy substrates

“…One approach under investigation is the use of surface modification techniques such as application of hard coatings to metal substrates to improve their tribological characteristics and also reduce the incidence of wear-particle induced osteolysis [10][11][12][13][14][15][16][17]. Application of TiN coating on implant bearing surfaces is one successful surface modification approach for improvement in wear and corrosion resistance [11][12][13].…”

“…Application of TiN coating on implant bearing surfaces is one successful surface modification approach for improvement in wear and corrosion resistance [11][12][13]. There are other ceramic materials such as Al 2 O 3 and ZrO 2 which have proven to be beneficial in improving the wear and corrosion performance of articulating surfaces [14][15][16][17]. This excellent behavior of ceramic materials has been attributed to their better electrochemical resistance, higher abrasion resistance and better surface wettability features compared with metallic implant materials.…”