Stainless steel - Mechanical polishing

|Even out the metal’s surface irregularities

The purpose of mechanical polishing is to even out the metal’s surface irregularities. The treatment generally comprises two stages. The first stage consists of roughly polishing the surface with abrasives. The second stage is finishing work with a fine grain abrasive.

The result of this entire treatment is a decrease in surface roughness and its enrichment in iron and chromium oxides. However, the mechanical action of rubbing by abrasives causes not only oxidation phenomena, but also disruptions to the crystalline structure.

This results in an uneven surface state, physically and chemically poorly defined, the properties of which are different from those of the metal mass. 

In short, mechanical polishing treatment by abrasion produces extremely smooth, but deformed, surfaces and their applications are limited to flat surfaces.

Whereas, an electro-polished surface does not cause disruptions of the metal’s structure associated with mechanical work.