Abstract
Due to the lack of in-depth study on the oxide film formation and stripping mechanism in the electrolytic plasma polishing (EPPo) process on valve metals, the regulation of the process parameters and polishing effect is seriously restricted, resulting in the optimization and improvement only relying on process experiments. Firstly, the formation mechanism of the oxide film was proposed based on the subsurface structure and composition analysis. Subsequently, the stripping mechanism of the oxide film was proposed by analyzing the composition of the exfoliation, the discharge phenomenon and surface evolution process. Furtherly, the role of oxide film formation and stripping in surface levelling of titanium alloy was explored and verified. Results show that an oxide film consisting of TiO2 and Al2O3 with a thickness of about 550 nm was left on the surface after EPPo. The plasma enhanced the electrochemical oxidation process, resulting in the formation of oxide film. Plasma discharge erosion in the film and electrochemical dissolution act together to strip the oxide film. The dynamic balance between formation and stripping is the key to achieving surface levelling. This work can provide theoretical guidance and technical support for EPPo on valve metals.
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