Phosphate-free (electrophoresis) - Auto parts

The following is an introduction to phosphorus-free (electrophoresis) used in automotive parts :

Rationale

Phosphorus-free electrophoresis is an advanced technology used in the surface treatment of automotive parts. It is based on the principle of electrochemistry. In the electrophoresis tank, the automotive parts are used as cathodes (or anodes) and are immersed in a solution containing phosphorus-free electrophoretic coating together with the anodes (or cathodes). When the power is turned on, the charged particles in the coating move in a directional manner under the action of the electric field and deposit on the surface of the parts to form a uniform and dense coating.

Characteristics of Phosphorus-free Electrophoretic Coatings

Environmental protection:

The characteristic of phosphorus-free electrophoretic coating is that it does not contain phosphorus, thus avoiding the pollution of phosphorus-containing wastewater to the environment. In the process of wastewater treatment, it is difficult to remove phosphorus from traditional phosphorus-containing electrophoretic coatings, which easily leads to eutrophication of water bodies. However, phosphorus-free electrophoretic coatings solve this problem from the source.

Phosphorus-free electrophoretic coatings also typically have a low VOC (volatile organic compound) content, with fewer harmful substances volatilized into the atmosphere during the coating process, reducing air pollution and complying with environmental regulations.

Corrosion resistance:

The coating formed by phosphorus-free electrophoresis has good corrosion resistance. It can form a continuous protective film with a certain thickness on the surface of automotive parts, preventing external corrosive substances such as moisture, oxygen, acid and alkali from contacting the base of the parts, thereby extending the service life of automotive parts.

The coating has excellent salt spray resistance. Auto parts that have undergone phosphorus-free electrophoresis treatment can remain corrosion-free for a long time in salt spray tests, meeting the requirements for automobile use in various harsh environments.

Adhesion:

Phosphorus-free electrophoretic coating has strong adhesion to the surface of automotive parts. This is because during the electrophoresis process, the paint particles and the surface of the parts undergo physical and chemical adsorption, forming a strong bond.

Good adhesion ensures that the coating will not fall off or peel off easily even if it is subjected to external forces such as vibration and impact during the driving of the car, thus ensuring the integrity and protective performance of the coating.