Preparation method for aluminium alloy surface composite membrane and solution formula thereof

Abstract

The invention discloses a preparation method for an aluminium alloy surface composite membrane and a solution formula thereof. The method comprises the following steps of: (1) putting a polished and cleaned aluminium alloy workpiece into an electrolyte containing elements to be infiltrated for being subjected to plasma electrolytic penetration processing, and forming a surface modification layer containing infiltrated element distribution on the surface of the aluminium alloy workpiece; and (2) after the processed workpiece is cleaned, putting the workpiece into an alkaline electrolyte to be subjected to plasma electrolytic oxidation processing; and finally, obtaining the composite membrane with high hardness and excellent comprehensive performances, such as corrosion resistance, abrasion resistance and friction resistance on the surface of the workpiece. The solution formula is as follows: the electrolyte during plasma electrolytic penetration processing comprises 10-140g / L of compound A containing elements C, N, B and S to be infiltrated and 2-30g / L of sodium hydroxide, wherein the compound A is one or a mixture of formamide, urea, ethanolamine, borax and thiourea.

Description

technical field [0001] The invention relates to a surface modification method of an aluminum alloy material. 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 oxidation technology developed on the basis of anodic oxidation. The processing technology is mainly applied to non-ferrous alloys such as aluminum, magnesium, and titanium, and can directly grow a layer of ceramic oxide film on the surface in si...

AI Technical Summary

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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