Study on environmentally friendly anodizing and sealing treatment of Ti-6Al-4V titanium alloy
The anodic oxide film was prepared on Ti-6Al-4V titanium alloy from environmentally friendly electrolyte,and then it was sealed by immersing in boiling water,ammonium fluozirconate solution and calcium acetate solution.The microstructure,chemical composition and phase structure of unsealed and sealed anodic oxide films were analyzed by scanning electron microscopy,energy disperse spectroscopy and X-ray diffractometer.Furthermore,the corrosion resistance of unsealed and sealed anodic oxide films was studied using acid sodium chloride solution as the corrosion medium.The results show that,compared with unsealed anodic oxide film,the anodic oxide films after sealing treat-ment in boiling water,ammonium fluozirconate solution and calcium acetate solution have fewer micro-pores,the chemical composition changes and the corrosion resistance is further improved.However,sealing treatment has no effect on the phase structure of the anodic oxide film.Various products such as hydrated titanium dioxide,titanium hydroxide,calcium hydroxide and calcium titanate are generated by chemical reaction during the sealing process in calcium acetate solution to achieve synergic sealing effect.The anodic oxide film after sealing treatment in calcium acetate solution has good surface densifi-cation,and its corrosion resistance is better than that of the anodic oxide film after sealing treatment in boiling water and ammonium fluozirconate solution,and the protective effect on titanium alloy is stronger.
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