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Surface Treatment Technology of MIM Parts

Surface Treatment Technology of MIM Parts

At present, parts with this forming method are used in many places, the main reasons are that their dimensional accuracy is very high and the product quality is higher than the parts forged by other methods. However, in order to meet different specific needs, surface treatment must be carried out in order to be better used. The surface treatment technology of metal injection molding products is as follows:

1. Polishing treatment of MIM parts

Polishing treatment of metal powder injection molding refers to the processing method of reducing the surface roughness of the workpiece by mechanical, chemical or electrochemical action to obtain a bright and flat surface.

2. Electroplating treatment of metal injection molding

Electroplating is a technology in which a metal film is attached to the surface of metal or other materials of MIM parts by electrolysis. Electroplating can prevent metal oxidation (such as corrosion), improve wear resistance, conductivity, reflection, corrosion resistance (copper sulfate and so on.) and improve beauty.

3. PVD treatment of metal injection molding

PVD refers to the process of using physical processes to realize material transfer and transfer atoms or molecules from the source to the substrate surface. The role of PVD treatment of MIM manufacturing is to spray some particles with special properties (high strength, wear resistance, heat dissipation, corrosion resistance and so on.) on the matrix with lower performance, so that the matrix has better performance.

4. Blackening treatment of metal injection molding

Blackening is a common means of chemical surface treatment. The principle is to produce an oxide film on the metal surface to isolate the air and achieve the purpose of rust-proof. Blackening treatment can be adopted when the appearance requirements are not high. The main components of blackening liquid are sodium hydroxide and sodium nitrite.

The purpose of surface treatment is to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of products. MIM parts generally need various surface treatments to obtain better corrosion resistance, wear resistance and conductivity property, high-quality surface and so on.

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