Preparation process for corrosion-resistant aluminum coating with conductive performance on magnesium alloy surface

Abstract

The invention discloses a preparation process for a corrosion-resistant aluminum coating with conductive performance on a magnesium alloy surface, and the preparation process is mainly used for solving the problem that a coating prepared by a current aluminum coating spraying preparation technology is relatively low in corrosion resistance. The preparation process comprises the following steps: carrying out sand blasting treatment on the aluminum alloy surface; selecting aluminum alloy powder, wherein the grain size of the aluminum alloy powder is 325-425 mu m, excellent mobility is guaranteed, an aluminum coating is prepared by adopting a plasma spraying mode, the thickness of the coating is controlled within 0.05-0.3mm, and porosity is controlled to be lower than 3%; uniformly coating an aluminum colloid containing a permeation-promoter on the surface of the aluminum coating before thermal treatment, and then carrying out vacuum thermal treatment on the aluminum colloid, wherein process parameters are controlled as follows: a temperature of 410-430 DEG C, time of 90-150 minutes, and a uniform and continuous transition layer is formed between a basal body and the coating; and carrying out alkaline washing and acid washing on the surface of the coating, carrying out chemical oxidization treatment on the surface of the coating, wherein the surface of the coating is in continuous and uniform dark yellow. According to the preparation process, on the basis of preparing the aluminum coating with relatively high quality, improvement measures for corrosion resistance are carried out on the coating, so that the corrosion resistance of the integral aluminum alloy aluminum coating is improved, and the conductive performance is guaranteed.

Description

technical field [0001] The invention belongs to the field of magnesium alloy surface treatment, and more specifically relates to a preparation process of a corrosion-resistant aluminum coating with electrical conductivity on the surface of a magnesium alloy. Background technique [0002] As the miniaturization and lightweight requirements of electronic products are getting higher and higher, especially in aerospace, national defense and other fields, the use of magnesium alloys requires its corrosion resistance and surface conductivity. Due to the high chemical activity of magnesium alloys and poor corrosion resistance, magnesium alloys have become The bottleneck of the large-area application of magnesium alloys has greatly restricted the application of magnesium alloys. Therefore, we designed the surface coating preparation process to spray aluminum coating on the surface of magnesium alloy, improve the bonding force between the coating and the substrate, improve the corros...

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Problems solved by technology

[0004] However, in the existing aluminum coating spraying preparation process, the bonding force between the coating and the magnesium alloy substrate is relatively low, and the thickness of the aluminum alloy coating with a certain corrosion resistance also needs to be reduced. At the same time, the porosity of the coating also needs to be reduced. It needs to be controlled and reduced, and the corrosion resistance of the aluminum coating surface also needs to be further improved to improve the corrosion resistance of the magnesium alloy coating

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