1. Why and when to degrease a metal surface?

Given the diversity of the industrial sectors concerned, we will give a general definition of degreasing:

Because the quality of any surface treatment (ST) depends on the physical and chemical characteristics of the surface on which it is to be applied, degreasing is a key operation in the manufacturing process.

Before undergoing a TS, a metallic material is generally oxidized and covered with oils or greases. The material must therefore be pre-cleaned, in the broadest sense of the term, to move from a soiled and generally hydrophobic interface to one that is physically and chemically clean and...