In order to prevent the steel’s surface from corroding and prolong its service life, people coat the zinc on the surface of the steel, and the steel becomes galvanized plate. Before the galvanization, people often do the degreasing process. CAMELSTEEL notices that there are some degreasing process as follows. They are physics machine degreasing process, organic solvent degreasing process, chemical degreasing process, electrochemical degreasing process and the above combination processes.
Degreasing process is also called degrease. Before the galvanization, people eliminate the greasy dirt on their surface. Because the deoiling efficiency will affects the galvanization quality.
The grease on the steel surface is mainly the hydrocarbon. Some hydrocarbon does not react with soda, so it is called unsaponifiable oil. People should use the emulsification and dissolution to purify the oil. But other oils which react with alkali is called saponified oil. So people adopt the saponification, emulsification and dissolution to purify the oil.