1. Different acidification mechanisms:
Pickling refers to the use of pickling solutions such as hydrochloric acid, sulfuric acid and other substances on the workpiece to wash off the oxide layer and dust. The role of cleaning the surface;
Phosphating is a treatment method, phosphating liquid, zinc phosphating liquid, manganese phosphating liquid, etc., there are many kinds of phosphating, the role is different, such as the phosphating of steel wire is to make the steel wire in the fine lubrication, some in order to play the role of priming, enhance the bonding force of the matrix and the paint, and some play the role of corrosion resistance;
2, the conversion mechanism is different:
Phosphating is a process of chemical and electrochemical reaction to form a phosphate chemical conversion film, and the phosphate conversion film formed is called phosphating film. The main purpose of phosphating is to provide protection for the base metal and prevent the metal from being corroded to a certain extent; It is used for primer before painting to improve the adhesion and anti-corrosion ability of the paint film. It is used for antifriction lubrication in metal cold working process.
Pickling The method of using an acid solution to remove the oxide and rust on the surface of steel is called pickling. It's a way of cleaning metal surfaces. It is usually carried out with a pre-film. Generally, the parts are immersed in an aqueous solution such as sulfuric acid to remove the oxide film on the metal surface. It is the pre-treatment or intermediate treatment of electroplating, enamel, rolling and other processes.