Supervisor:
Southwest Ordnance Industry Bureau
Organizer:
Chongqing Ordnance Industry Society
Chongqing University of Technology
Chongqing University of Technology
Research on microhardness and corrosion resistance of erbium doped composite coatings on the surface of TC4
| DOI: | 10.11809/bqzbgcxb2025.03.034 |
| Keywords: | TC4 alloy; plasma electrolytic oxidation; hydrothermal synthesis; erbium doped coating; corrosion resistance |
| Abstract: | The ceramic composite coating containing hydroxyapatite was prepared on the surface of TC4 titanium alloy by plasma electrolytic oxidation/hydrothermal synthesis (PEO/HTS) to improve its biological activity and corrosion resistance. The composite coatings were characterized by XRD, SEM, contact Angle measuring instrument and electrochemical workstation. The results showed that the hydrophilic coating containing hydroxyapatite was prepared on the surface of TC4 by PEO/HTS technology and the effects of Er(NO3)3 doping amount in the hydrothermal synthesis solution on the phase composition, microstructure, contact Angle and corrosion resistance of the coating were investigated. The results showed that the main crystal phases of the PEO/HTS composite coating were A TiO2, HAp and Ti. In the meantime, there were trace R TiO2, Er2O3 and La2O3 phases. With the increase of Er(NO3)3 doping in the synthetic solution, HAp content in the coating increased. The Er element was involved in the synthesis of hydroxyapatite by hydrothermal treatment. The microporous defects of ER doped PEO/HTS composite coatings reduced. The contact Angle of ER doped PEO/HTS coatings decreased and the hydrophilicity increased, which was related to the smoothness of the coating surface and the formation of hydrophilic hydroxyapatite. The corrosion current density of the PEO/HTS composite coating obtained after doping Er(NO3)3 reduced by about one order of magnitude. |
| Issue: | Vol. 46 No. 3 (2025) |
| Published: | 2025-03-31 |