Protective adhesive and preparation method thereof, and aluminum alloy workpiece surface treatment process

Abstract

The invention discloses a protective adhesive and a preparation method thereof, and an aluminum alloy workpiece surface treatment process. The protective adhesive comprises the following components inpercentage by mass: 20%-40% of silicone rubber, 5%-30% of acrylate, 30%-50% of epoxy resin, 5%-10% of benzoyl peroxide, 3%-5% of hydroquinone and 3%-5% of a silane coupling agent. The protective adhesive can be matched with micro-arc oxidation to perform surface treatment on an aluminum alloy workpiece, the workpiece is pretreated, the protective adhesive is prepared, the protective adhesive is brushed to a non-micro-arc oxidation area, micro-arc oxidation treatment is carried out on a to-be-micro-arc oxidation area, and finally post-treatment is carried out. The protective adhesive can be tightly bonded with protected metal, an effective solution shielding layer is formed, micro-arc oxidation resistance and micro-arc local spark discharge performance is achieved, the effects that a protected part is free of a film layer and the protective adhesive has the effect of quick stripping are achieved, a complex part and a negative shape of the aluminum alloy workpiece can be locally protected, and the period of surface treatment of the aluminum alloy workpiece is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of protective glue and surface treatment of aluminum alloy workpieces, in particular to a protective glue and a preparation method thereof, and a surface treatment process of aluminum alloy workpieces. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, easy processing and forming, and good electrical and thermal conductivity. It is widely used in aerospace, automobiles, ships, construction, electrical and electronics, etc. However, due to the low strength of the aluminum alloy surface, poor corrosion resistance, hardness and wear resistance, it often cannot meet some design requirements. Especially in some special environments, such as acidic or alkaline atmosphere, containing Cl - atmosphere, etc., aluminum alloys are prone to corrosion. This severely restricts the application of aluminum alloys. [0003] When the aluminum alloy is naturally placed in ...

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Problems solved by technology

The tooling protection method is to prepare the aluminum alloy tooling of the same material, which is closely connected with the part to be protected, so that the part to be protected does not have direct contact with the electrolyte, and there is no micro-arc oxidation film layer growth, so as to achieve the purpose of local protection. This method is for regular The protection of the parts has a good effect, but for parts with complex shapes and irregular shapes of the protected parts, it is difficult to process the tooling, and it is not suitable for local protection; the resin paint protection method is to use epoxy resin to spray or spray on the parts to be protected. Brush a layer of resin paint, and after the micro-arc oxidation treatment is completed, remove the protective glue with an organic solvent such as a paint remover, which also achieves the purpose of partial protection. The secondary pollution of the arc oxidation film has a greater impact on the micro-arc oxidation process with post-treatment