Method for improving binding force of priming paint on aluminum alloy parts

Abstract

The invention belongs to an aluminum alloy surface protection technology and in particular relates to a method for improving binding force of priming paint on aluminum alloy parts. The method comprises the following steps: uniformly polishing the surface of a machined part by using fine grit sandpaper under the condition that the tolerance of the part is not influenced and then polishing by using a sand felt so that a smooth base layer is exposed out of the surface of the part. Therefore, the lines on the surface of the part are disordered and the roughness of the base surface is improved so that a film is easily formed on the aluminum alloy base in chemical conversion treatment process, the appearance of the film layer is continuous and complete, and the binding force between the priming paint of the part and the base is effectively improved. The technology disclosed by the invention is easy to operate and low in cost, and some aircraft return parts to be repaired can be operated. Therefore, the difficulty in detaching the parts from the assembly is eliminated and the surface protection performance of the part can be improved. A protective effect which is the same as that of part dipping treatment can be achieved.

Description

technical field [0001] The invention belongs to the aluminum alloy surface protection technology, and in particular relates to a method for improving the bonding force of primers of aluminum alloy parts. Background technique [0002] The compensation cover plate of the 1014-1020 frame machine (finished product) of the XX model machine, the material of the four cover plates is 7010 aluminum alloy machined parts. However, since the aluminum alloy parts are treated with hand-painted chemical conversion treatment before painting, if the chemical conversion film layer is uneven and discontinuous, it may lead to poor bonding between the primer and the substrate, so it frequently occurs in the riveting workshop. Severe paint peeling. This phenomenon has seriously affected the production schedule and delayed the delivery schedule of the fuselage. Contents of the invention [0003] The purpose of the present invention is to propose a method that can effectively improve the bondin...

AI Technical Summary

Problems solved by technology

However, since the aluminum alloy parts are treated with hand-painted chemical conversion before painting, if the chemical conversion film layer is uneven and discontinuous, it may lead to poor bonding between the primer and the substrate, so it frequently occurs in the riveting workshop. Severe paint peeling

This phenomenon has seriously affected the production schedule and delayed the delivery schedule of the fuselage

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