The purpose of pre-treatment for electroplating and electrophoretic coating of electric heating tubes

The purpose of pre-treatment for electroplating and electrophoretic coating of electric heating tubes

Electrophoretic coating, like other coating methods, requires surface treatment before coating. Surface treatment is an important task that must be carried out before coating. Different coating methods, materials, and surface conditions require different surface treatment processes and methods. Not only do different surface treatment processes and quality seriously affect coating quality, but surface treatment costs also have a significant impact, Therefore, when conducting technical design, we must choose surface treatment processes and methods that are targeted, effective, and cost-effective as much as possible based on the coating method, material of the coating, and surface condition.

The purpose of pre-treatment for electrophoretic coating.

The main purpose of surface treatment before electrophoretic coating is to remove obstacles between the coating film and the surface of the coating, eliminate factors that affect the combination of the two, such as oil stains, rust stains, oxide skin, and other impurities, and provide the following good conditions for electrophoretic coating:

A surface with good conductivity and high flatness.

There is a uniform and fine film with a thickness of 1-3 μ m. A protective film (phosphating film) with good conductivity can not only prevent pre coated parts from rusting before electrodeposition, but also improve the adhesion and quality of the coating.

The surface cleanliness of the pre coated parts is extremely high,. Non polluting electrophoresis tank solution.

The surface of the coating remains moist to facilitate electrodeposition.

2. Selection of surface treatment process for electrophoretic coating:

According to the quality requirements of electrophoretic coating, there are five main surface treatment processes that constitute it. Degreasing and rust removal - water washing - surface adjustment - phosphating - water washing. Degreasing and rust removal is the most important process in surface treatment technology. It is not only because the processing cost of this process is the largest process in the entire surface treatment process, but also has a significant impact on the entire coating cost. According to relevant user calculations, the processing cost of degreasing and rust removal process accounts for about 1/2-1/3 of the entire surface treatment cost, and 1/6-1/4 of the total coating cost. At the same time, the quality of the degreasing and rust removal process is guaranteed, The quality of the subsequent processes can be easily guaranteed.

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