Anti oxidation treatment for surface of machined copper parts

Anti oxidation treatment for surface of machined copper parts

In the process of Machining Copper parts, heat treatment, transportation and storage of the machined copper parts, the surface of the machined copper parts will be oxidized to different degrees, producing a layer of thick and thin oxidation layer. At the same time, machined copper parts are also vulnerable to all kinds of oil pollution and adsorption of some other impurities. Therefore, surface protection should be carried out to make it keep bright and new appearance and corrosion resistance and oxidation resistance for a long time. That requires a variety of copper surface treatment processes. The commonly used copper surface treatment processes are as follows:

1, copper bright cleaning: It is mainly to thoroughly clean the dirt, impurities, spots and oil stains on the surface of copper, and then restore the bright color of copper itself. It is also the required process before copper passivation.

2, copper passivation: the role of passivation is known to be mainly against oxidation and corrosion resistance. Because copper is a reactive metal, it is particularly prone to oxidize and even appear green in wet or special conditions. Therefore, copper passivation is one of the most necessary processes. It can effectively protect the surface of the machined copper parts.

3, anodization: copper is used as anode, electrolytic method is used to form oxide film on the surface. Oxide films change the surface state and properties, such as surface coloring, improve corrosion resistance, enhance wear resistance and hardness, and protect the surface of machined copper parts.

4, electroplating: the purpose of electroplating is to deposit metal coating on copper substrate and change the surface properties or dimensions of copper substrate. Electroplating can enhance corrosion resistance, hardness, abrasion resistance, electrical conductivity, smoothness, heat resistance and surface beauty of machined copper parts.

5, copper chemical polishing: the machined copper parts are soaked directly in the copper chemical polishing liquid to make it fast to bright as the new beautiful color, and quickly remove the surface oxide, the surface size will have the corresponding change, but can be controlled artificially. Passivation of machined copper parts after chemical polishing should be carried out as soon as possible to prevent oxidation and discoloration.