Corrosion-resistant and wear-resistant Cr-plated PVD composite coating and preparation method thereof

Abstract

The invention discloses a corrosion-resistant and wear-resistant Cr-plated PVD composite coating and a preparation method thereof. The Cr-plated PVD composite coating disclosed by the invention sequentially comprises a Fe matrix, a Fe-Cr diffusion layer, a Cr-plated layer and a PVD coating, wherein the average mass percent of the Cr content of the Fe-Cr diffusion layer is 6-45%, and the depth of the diffusion layer is 5-50 mum. The preparation method of the corrosion-resistant and wear-resistant Cr-plated PVD composite coating comprises the steps of: firstly, forming the Cr-plated layer on the surface of the Fe matrix through electroplating; after annealing treatment, forming the Fe-Cr diffusion layer; and then depositing the PVD coating on the surface of the Cr-plated layer to form the PVD composite coating. The corrosion resistance of an interface of the Fe matrix and the PVD coating can be remarkably improved, and the adhesiveness of the PVD coating at the interface can be enhanced, so that the problem that the PVD coating is liable to peel off due to interface corrosion is solved, and the corrosion resistance and the wear resistance of the Cr-plated PVD composite coating are improved.

Description

technical field [0001] The invention relates to the field of wear-resistant and corrosion-resistant technologies, and more specifically relates to a corrosion-resistant and wear-resistant Cr-PVD composite coating and a preparation method thereof. Background technique [0002] With the rapid development of new energy vehicles and 5G communication industries, aluminum alloy die castings and aluminum alloy extrusions are widely used. However, there are problems such as corrosion and wear in the mold during use, and it is difficult to meet the requirements for the mold surface when forming aluminum alloy parts, which in turn affects the quality and production efficiency of the product. Therefore, it is necessary to modify the surface of the mold. PVD coating has been widely used for surface modification of die-casting dies and stamping dies due to its high hardness, excellent wear resistance and corrosion resistance. The corrosive medium penetrates into the matrix, causing int...

AI Technical Summary

Problems solved by technology

PVD coating has been widely used for surface modification of die-casting dies and stamping dies due to its high hardness, excellent wear resistance and corrosion resistance. The corrosive medium penetrates into the substrate, causing interface corrosion and cracking, and accelerating the failure of the mold surface

[0003] In the prior art, the alloy layer is often used to enhance the corrosion resistance of the workpiece. For example, CN101215708 discloses a method for preparing a corrosion-resistant nickel / chromium steel strip. The electrodeposition nickel / chromium coating and the low carbon steel strip are closely combined to form a corrosion-resistant steel strip. Corrosion of nickel / chrome-plated steel strips requires complex process and poor wear resistance. Therefore, it is necessary to develop a new wear-resistant and corrosion-resistant composite coating to improve the corrosion and wear resistance of the workpiece

Images