摘要
Anodic oxidation is a prevalent technique to introduce superior corrosion and wear resistance upon the surface of titanium(Ti)alloys,in which the selection of appropriate electrolytes and defect-sealing strategies is a key.This study aims to address such issues through anodizing Ti-10V-2Fe-3Al alloy in malic acid,followed by a post-sealing treatment with Mg-Al layered double hydroxides(LDHs).The characteristics of the samples were investigated using scanning electron microscopy(SEM),atomic force microscopy(AFM),glow discharge optical emission spectroscopy(GDOES),X-ray diffraction(XRD)and energy-dispersive X-ray spectroscopy(EDS).SEM micrographs reveals that the anodic coating had a surface full of bulges and cracks,and was almost sealed by the following LDHs treatment.XRD pattern indicate that the anodic coating was mainly consisted of amorphous TiO2 with a small fraction of anatase,but its crystallization degree was increased through the post-sealing.Moreover,electrochemical and tribological measurements demonstrate that corrosion current density was 2.8×10-6,2.0×10-7,5.9×10-9A cm-2,and wear rate was 1.45×10-3,1.30×10-4 and 6.90×10-5 mm3 N-1 m-1 for respective bare Ti-10V-2Fe-3Al alloy substrate,anodized specimens without and with the LDHs post treatment.Finally,a plausible wear mechanism was proposed.
Anodic oxidation is a prevalent technique to introduce superior corrosion and wear resistance upon the surface of titanium（Ti） alloys, in which the selection of appropriate electrolytes and defect-sealing strategies is a key. This study aims to address such issues through anodizing Ti-10V-2Fe-3Al alloy in malic acid, followed by a post-sealing treatment with Mg-Al layered double hydroxides（LDHs）. The characteristics of the samples were investigated using scanning electron microscopy（SEM）, atomic force microscopy（AFM）, glow discharge optical emission spectroscopy（GDOES）, X-ray diffraction（XRD） and energy-dispersive X-ray spectroscopy（EDS）. SEM micrographs reveals that the anodic coating had a surface full of bulges and cracks, and was almost sealed by the following LDHs treatment. XRD pattern indicate that the anodic coating was mainly consisted of amorphous TiO2 with a small fraction of anatase,but its crystallization degree was increased through the post-sealing. Moreover, electrochemical and tribological measurements demonstrate that corrosion current density was 2.8 × 10-6, 2.0×10-7, 5.9×10-9A cm-2, and wear rate was 1.45×10-3, 1.30×10-4 and 6.90×10-5 mm3 N-1 m-1 for respective bare Ti-10V-2Fe-3Al alloy substrate, anodized specimens without and with the LDHs post treatment. Finally, a plausible wear mechanism was proposed.
基金
supported financially by the National Natural Science Foundation of China(Nos.51971040,51701029 and 51531002)
the National Key Research and Development Program of China(No.2016YFB0301100)
the Chongqing Research Program of Basic Research and Frontier Technology(No.cstc2016jcyjA0388)
the China Postdoctoral Science Foundation Funded Project(Nos.2017M620410 and 2018T110942)
the Chongqing Postdoctoral Scientific Research Foundation(No.Xm2017010)
the Fundamental Research Funds for the Central Universities(No.2018CDGFCL005).
