Surface Treatment Technology - Chemical Methods

Chemical method for surface treatment in powder metallurgy process is using interaction of chemical substances to form a coating layer on the surface. This method is not current effect,. Its main method is:

(1)   chemical conversion treatment

In electrolyte solution, the interaction of chemical substance and product make product surface form a coating, which is called chemical conversion treatment.  Such as bluing, phosphating, passivation and chrome -pickle treatment.

(2) Chemical plating

In electrolyte solution, catalyzing product surface without external current, as a result of chemical reduction, some material was deposited on product’s surface to form coating, which is known as chemical plating. such as chemical nickel plating, electroless copper plating etc.

Original article link：

http://www.zcmim.com/article/powder-metallurgy-process-sttcm_1.html

Introduction of powder injection molding surface treatment sand blasting

In the powder injection molding, products of all subsequent will use surface processing, we take a look at the sand blasting surface treatment is how the blasting is the use of compressed air to quartz sand high-speed blown out on the parts surface cleaning method. The factory is also called blowing sand, not only to rust, but also by removing oil, it is very useful for coating. Sandblasting for complex shape, easy to use manual derusting, efficiency is not high, the environment is not good, rust is not uniform.

Sandblasting gun general sandblasting machine have various specifications, as long as it is not a particularly small box, can put the gun into it.

The oxide skin pressure vessel supporting products - head using blasting mode to remove the surface of the quartz sand diameter is 1.5mm ~ 3.5mm.

There is a kind of processing is the use of water as a carrier, to drive the diamond sand to process parts, is a kind of sand blasting. Sandblasting is mainly manual operation. The main function of blasting surface derusting, descaling, such as heat treated parts.

MIM can describe the product surface processing

Surface processing refers to the surface of the base metal through various methods (mechanical, chemical, electrochemical, physics and so on), the formation of new surface layer on the substrate. This new layer surface is designed to the people, therefore, whether the state of the metal matrix suitable for surface processing requirements is very important. Surface treatment is usually surface adjustment (grinding, polishing, sandblasting, eaves gutter, CNC high light etc.), surface cleaning (in addition to wax, degreasing, cleaning, etc.), surface conversion film processing (chemical oxidation, chemical passivation, phosphating etc.), metal coloring (electroplating, PVD, fuel injection, electrophoresis, etc.).