A PVD two-color wire drawing treatment method on the surface of a workpiece

Abstract

The invention provides a PVD two-color wire drawing treatment method on the surface of a workpiece. The method is as follows: firstly, the PVD technology is used to deposit the bottom film on the surface of the workpiece; then, the magnetron sputtering method is used, and graphite is used as the target material, and the graphite-like layer is sputtered and deposited on the bottom film surface as a black film; finally, wire drawing is carried out. , to obtain a two-color film. Compared with the existing metal carbide etc. as the black film, the present invention uses the graphite-like layer as the black film, which has a good bonding force with the underlying film on the one hand, and on the other hand has lower hardness and Good toughness, so it is easy to achieve delamination with the underlying film, and the two-color film is obtained through wire drawing, which avoids the phenomenon that the black film cannot be pulled off or the two layers of film are pulled off at the same time.

Description

technical field [0001] The invention belongs to the technical field of surface treatment, and in particular relates to a PVD two-color wire drawing treatment method on the surface of a workpiece. Background technique [0002] With the improvement of people's living standards, consumer products industries such as household appliances, automobiles, and electronics have developed rapidly. At the same time, people have also put forward diversified demands on the appearance of products. It is an essential element of sales, and greatly increases the added value of various products. At present, products with an antique two-color appearance are popular year by year at home and abroad, especially in the high-end product market. [0003] The antique surface treatment of the product mainly adopts the process of electroplating brass, copper, or bronze on the surface of the product to form a dark brown oxide film, and then using wire drawing technology to destroy part of the dark brown ...

AI Technical Summary

Problems solved by technology

[0004] Although electroplating on the surface of products can obtain highly anti-corrosion, high wear-resistant and highly decorative coatings, there are recognized shortcomings in the electroplating process: a large amount of waste water containing harmful chemicals is produced, which seriously pollutes the environment, so it is urgent to improve

[0007] (1) When the drawing force is small, the surface black film cannot be destroyed, and when the drawing force is increased, it is easy to destroy the bottom film and the surface black film at the same time to expose the base of the workpiece;

[0008] (2) When using PVD technology to deposit the black film on the surface, the blackness of the black film is often adjusted by adjusting the flow rate of carbon source gas and nitrogen gas. However, in actual operation, there are often unstable flow control and uneven gas distribution in the furnace cavity. Therefore, it is easy to cause large color differences between the deposited films obtained at different positions in the same furnace and between the deposited films of different furnaces, and the color consistency is difficult to control; in addition, for products with high blackness, high gas The flow is deposited, which is easy to cause target poisoning;

[0009] (3) The structure of the black hard film is unstable, and it is prone to discoloration after heating or ultraviolet light irradiation

[0010] Therefore, the preparation of the surface black film is one of the keys to the successful application of PVD technology in the two-color wire drawing surface treatment, and when the metal carbide film is used as the surface black film, the drawing process is unstable, difficult to control, and the product qualification rate is low.

[0011] The Chinese invention patent application with application number 201210269744.4 discloses a two-color wire drawing dry coating method for metal parts, in which PVD coating technology is used to prepare two-color thin films; however, traditional metal carbides such as CrC, TiC, etc. are still used as black films layer, so the above problem is still not solved