Effect of liquid degreaser on pretreatment before coating

Overview: Degreasing is one of the basic processes of pretreatment before coating. It uses the saponification, wetting, emulsification, penetration, separation, dispersion and solubilization of high efficiency liquid degreaser to remove all kinds of grease, dust and sediment, metal powder, sweat and oily dirt adhered to by the workpiece during processing.

The effect of using high efficiency liquid degreaser in coating pretreatment and even in the whole coating process is shown as follows:

1. Affect the phosphating quality.

The phosphating process completely depends on the good contact between the phosphating bath liquid and the workpiece surface, and to ensure this, it is necessary to effectively and thoroughly remove all kinds of grease, dirt, rust, oxide scale and other foreign matters on the workpiece surface by using efficient liquid degreaser before or during the phosphating process. If the foreign matters on the surface of the workpiece are not completely removed, these foreign matters will act as a mechanical barrier to the phosphating, delay the film forming speed, affect the combination of the phosphating crystal and the surface of the workpiece, and even completely hinder the contact between the phosphating bath solution and the surface of the workpiece, resulting in the failure to form the phosphating film.

2. Affect the film quality.

If the degreasing is not complete, the phosphating film is uneven although it is formed. Although some dirt is covered by the phosphating film, the adhesion between the phosphating film and the surface of the workpiece is poor, which is easy to cause blistering and falling off of the coating.