Electrochemical polishing characteristics of additively manufactured TC4 titanium alloy
Electrochemical polishing is one of the surface treatment methods for TC4 titanium alloy additive manufacturing.The electrochemical polishing behavior of TC4 titanium alloy by additive manufacturing in ethylene glycol-sodium chloride electrolyte has been studied with testing methods such as cyclic voltammetry,AC impedance,chronoamperometry,and X-ray photoelectron spectroscopy(XPS).The results show that the oxidation order of titanium alloy in the ethylene glycol-sodium chloride system is Ti→TiO→Ti2 O3→TiO2.The application potential affects the thickness process of the passive film on the titanium alloy surface.With the increase of the applied potential,the thickness of the passive film first increases and then decreases.According to the change law of the passivation film,a two-stage polishing method is proposed,in which the polishing rate is faster compared with the potential polishing of the single passivation zone.The best polishing effect is achieved after 25 min of this method,and the surface roughness is reduced to 2.6 μm.
additive manufacturingTC4 titanium alloyelectrochemical polishingoxide film
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维普
