Cataphoresis galvanic treatments for metal protection

luglio 02, 2025

Have you ever wondered how to effectively protect your metal components from corrosion, even with the most complex geometries? Cataphoresis galvanic metal protection treatments are one of the most reliable solutions in the mechanical transmission industry.

For a recent project, we were asked to provide this specific surface treatment: cataphoresis. This galvanic process is particularly suited to protecting metals from the effects of atmospheric agents, improving the component's durability and aesthetic quality.

What is cataphoresis?

Cataphoresis is one of the most advanced electrochemical treatments available for metal protection. The part to be treated is immersed in a tank containing a water-based paint, usually epoxy, where the particles are electrically charged. The application of direct current causes these particles to migrate and deposit uniformly on the surface, forming a thin, even protective layer.

The process takes place under controlled conditions, at a temperature between 28°C and 35°C. In the final polymerization phase, the piece is placed in an oven at temperatures between 170°C and 200°C, essential for achieving good adhesion and long-lasting protection.

The advantages of cataphoresis

Among the cataphoresis galvanic treatments for metal protection, this process solves several technical problems. First, it offers uniform corrosion protection, even on complex or internal surfaces. Furthermore, it ensures excellent adhesion and a precise aesthetic finish, also acting as a primer for any subsequent aesthetic or functional treatments.

Another major advantage is its resistance to salt spray, which can last up to 1,000 hours depending on the thickness of the coating and the pretreatment performed.

Where it is used

Cataphoresis is widely used in the automotive, agricultural, and industrial sectors. It is used on components such as frames, flanges, gears, gearboxes, supports, and metal structures exposed to atmospheric agents. Cataphoresis galvanic treatments for metal protection are therefore ideal for all applications where geometric precision and corrosion resistance are essential requirements.

Selective Surface Treatment

Another important aspect of this treatment is the possibility of selective protection. Mechanical masking allows sensitive areas such as functional mating surfaces, threaded holes, or welding zones to be excluded. This allows critical tolerances to be maintained and surfaces that must not be coated to be protected.

Cataphoresis Compared to Other Treatments

Compared to other solutions, cataphoresis galvanic metal protection treatments offer significant advantages. Burnishing, for example, is purely aesthetic with little corrosion protection. Zinc plating, while protective, requires greater thicknesses and less precision on complex geometries.

Cataphoresis, on the other hand, represents an ideal balance between resistance, precision, controlled thickness (between 15 and 35 microns), and compatibility with subsequent processes.

In summary, cataphoresis galvanic metal protection treatments are a modern and versatile technology, suitable for ensuring long-lasting quality on complex metal components or those exposed to harsh environmental conditions. However, it's important to consider the investment required for specialized equipment and verify compatibility with the materials being used.

If you'd like to learn more about applying cataphoresis to your components or compare it with other surface treatments, contact GSI Ingranaggi for a dedicated technical consultation.

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