Surface Treatments and Corrosion Protection

Zinc alloys are characterized by excellent inherent properties, which can be further enhanced through appropriate surface treatment. Surface finishing not only increases corrosion resistance, but also ensures an aesthetic appearance and additional functional properties according to customer requirements. At TENZA cast, we provide a wide range of advanced surface treatments – from basic mechanical methods to sophisticated electroplating processes and cathodic dip coating (KTL).

Mechanical Surface Treatments

Before applying protective coatings, the casting surface is typically pre-treated:

Vibratory tumbling with polishing media – to achieve a smooth surface,
Abrasive blasting – to ensure uniform cleaning and surface homogenization.

These processes create an optimal base for subsequent coating layers.

Electroplating and Alloy Coatings

Electroplating processes provide a high level of protection against corrosion and mechanical wear. The most commonly used methods include:

Acid and alkaline zinc plating – universal corrosion protection,
ZnNi (zinc-nickel alloy coating) – high resistance in aggressive environments (e.g., automotive industry),
ZnFe (zinc-iron alloy coating) – a cost-effective combination of corrosion protection and performance.

Alloy coatings are particularly suitable for components exposed to high humidity, chemical influences, or long-term mechanical stress.

Passivation – A Protective Barrier Against Corrosion

Standard passivation – basic protection that extends surface service life,
Thick-film passivation – enhanced resistance to moisture, salts, and chemically aggressive environments.

Passivation increases the effectiveness of electroplated coatings and significantly improves the durability of castings..

KTL – Cathodic Dip Coating

Cathodic dip coating (KTL) is an advanced painting technology in which the component is immersed in a bath and coated with paint through an electrochemical process. Advantages of KTL:

High and uniform coverage, even in cavities and hard-to-reach areas,
Excellent corrosion resistance,
Smooth and aesthetically appealing surface finish,
Possibility of combination with additional coating systems.

Decorative Surface Finishes

For customers who also emphasize visual appearance, we offer:

Chrome plating (bright or matte),
Nickel plating,
Powder coating in customer-specified colors,
Additional customized surface effects.

Advantages of Surface Treatments at TENZA cast

Broad portfolio of technologies – from standard to highly specialized processes,
Increased resistance to corrosion and mechanical wear,
Aesthetic and decorative enhancements,
Adaptation to specific operating conditions,
Comprehensive solutions including surface preparation and final quality inspection.

Would you like to increase the service life and durability of your castings? Contact us and choose the surface treatment that best meets your requirements.