Method for ultrasonic-assisted electrolytic plasma polishing of titanium alloy

Abstract

The invention discloses a method for ultrasonic-assisted electrolytic plasma polishing of a titanium alloy. The method includes the steps that firstly, a mixed electrolyte containing sodium aluminate,sodium hexametaphosphate and potassium hydroxide is blended to serve as a polishing solution; a titanium alloy test piece is immersed into a stainless steel tank containing the polishing solution, the titanium alloy test piece is connected with an anode, and the stainless steel tank is connected with a cathode; then a double-pulse power supply with the positive polarity voltage of 350 V-450 V, the negative polarity voltage of 30 V, the pulse frequency of 350 Hz-450 Hz and the duty ratio of 35%-45% is applied between the cathode and the anode; the current waveform in the polishing process is detected, and an ultrasonic cavitation effect with the oscillation frequency of 30 kHz-50 kHz is applied to the polishing solution only through an ultrasonic device at the bottom of a polishing tank inthe inter-pulse stage of the waveform; and a circulating water cooling system is adopted for cooling the polishing tank, so that the temperature of the polishing solution is kept at about 60 DEG C, and the titanium alloy test piece is polished for at least 10 min. According to the method, the ultrasonic-assisted electrolytic plasma polishing technology is adopted, and effective polishing of a complex wall face and a cavity of the titanium alloy is achieved through the effects of electrochemical oxidation passivation, discharge plasma etching activation, ultrasonic enhanced activation and thelike.

Description

technical field [0001] The invention relates to the technical field of metal material surface treatment, in particular to a method for ultrasonically assisted electrolytic plasma polishing of titanium alloys. Background technique [0002] Titanium alloy has excellent characteristics such as low density, high specific strength, high melting point, corrosion resistance, non-magnetic, super memory, high toughness, etc. It has the reputation of "space metal", "universal metal" and "future metal", and is widely used in aviation , aerospace, shipbuilding, chemical, automotive, medical and other fields. [0003] In order to obtain the specified surface quality requirements, titanium alloy parts are usually finished by finishing or polishing process. Due to its characteristics of stickiness, toughness, elasticity and high chemical activity, titanium alloy is a typical difficult-to-machine material. Due to the small thermal conductivity, the heat generated by machining titanium all...

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Problems solved by technology

[0005] However, pure electrolytic plasma polishing has certain limitations. For example, in order to prevent the electrolytic plasma from "micro-discharge" to "arc discharge" from damaging the titanium alloy substrate, it is often required to input as little energy as possible, which will lead to discharge Plasma polishing of anodic oxide is not thorough enough, so other forms of energy are urgently needed to assist removal

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