Preparation method for composite film on titanium alloy surface and solution formula thereof

Abstract

The invention discloses a preparation method for a composite film on a titanium alloy surface and a solution formula thereof. The preparation method comprises the following steps of: (1) putting a polished and cleaned titanium alloy workpiece into an electrolyte containing elements to be permeated, carrying out plasma electrolytic osmosis treatment and forming a surface modifying layer containing permeating element distribution on the surface; (2) cleaning the processed workpiece, placing the workpiece into an alkaline electrolyte to carry out plasma electrochemical oxidation treatment, and finally, acquiring a composite film layer with high hardness and good comprehensive performances in anti-corrosion, wear resistance and wear reduction on the workpiece surface; the formula for the solution applied to the step (1) in the above preparation method is as follows: when the plasma electrochemical oxidation treatment is carried out, the electrolyte comprises the following components: 10-140 g / L of a compound A containing elements C, N, B and S to be permeated, and 2-30 g / L of sodium hydroxide; and the compound A is one or the mixture of formamide, carbamide, ethanolamine, sodium borate and thiocarbamide.

Description

technical field [0001] The invention relates to a surface modification method of titanium alloy. Background technique [0002] At present, the main methods of surface modification of non-ferrous alloy materials at home and abroad are: thermal spraying, chemical plating, electroplating, organic coating, thermal diffusion, vapor deposition, high-energy beam surface modification, chemical conversion, anodic oxidation, plasma electrolytic oxidation, etc. . New technology of surface engineering - plasma electrolytic deposition technology can be divided into two branches: plasma electrolytic infiltration technology and plasma electrolytic oxidation technology, among which plasma electrolytic oxidation is an advanced surface treatment technology developed on the basis of anodic oxidation , mainly used in aluminum, magnesium, titanium and other non-ferrous alloys, can directly grow a layer of ceramic oxide film on the surface in situ, compared with similar technologies, the perform...

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Problems solved by technology

Taking the plasma electrolytic oxidation technology involved in the present invention as an example, the existing composite method is to achieve co-deposition with the ceramic phase in the film layer under the action of plasma electrolytic oxidation by adding functional particles to the electrolyte, Or the composite film can be prepared by subsequent thermal spraying, physical vapor deposition, chemical plating, electroplating and other treatments on the ceramic oxide film, but these composite methods have cumbersome process, high cost, difficult to control, and cannot process workpieces with complex shapes, etc. problem, it is not easy to realize industrial application

At the same time, there is also the disadvantage of weak film bonding, which is caused by the inherent defects of mechanical bonding and molecular bond bonding in these subsequent surface treatment technologies.

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