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Znaczenie cynkowania galwanicznego w ochronie metali

The Importance of Galvanic Zinc Coating in Metal Protection

, by Oliwia Sajnaj, 3 min reading time

In this article, you will learn more about the electrochemical deposition of zinc on metal surfaces and the galvanic zinc coating processes we use in our industry.

What is Zinc Coating?

There are various methods of zinc coating, including hot-dip, galvanic, alkaline, and electrolytic. Galvanic zinc coating, which is our specialty, involves the electrochemical deposition of zinc on the metal surface.

Electrolytic galvanic zinc coating plays a crucial role in protecting metals from corrosion, ensuring the durability and aesthetic appearance of various products. This process involves covering metal surfaces with a layer of zinc, which acts as a protective barrier, preventing the oxidation of the base metal. As a result, steel and cast iron products gain increased resistance to atmospheric conditions and chemical factors. Zinc coating of parts can also serve as a primer for painting.

 

The Process of Galvanic Zinc Coating

The process of galvanic zinc coating is a complex but effective way of protecting metals. It involves immersing the metal element in a solution containing zinc salts and anode plates. This process is based on electrochemistry and utilizes the principles of current flow through an electrolyte. Through the electrochemical reaction, zinc is deposited on the metal. Galvanic zinc coating is carried out in several stages:

  • Surface Preparation – Metal parts are thoroughly cleaned of impurities, fats, and oxides to ensure good adhesion of the zinc coating.
  • Electrodeposition – The parts are immersed in a zinc bath, where a layer of zinc is deposited on the surface.
  • Passivation – The applied zinc layer is passivated to increase its resistance to corrosion and to give the desired appearance.

 

Our Galvanic Zinc Coating Services

Our company specializes in two main forms of galvanic zinc coating: barrel plating and rack plating.

 

Barrel Plating

Barrel plating, also known as bulk zinc plating, is ideal for smaller parts such as screws, nails, profiles, and shapes. This process involves placing small parts in a rotating barrel, where they are evenly coated with a layer of zinc. It is an efficient method for large quantities of small parts, ensuring even coverage and high-quality coating.

 

Rack Plating

Rack plating is intended for larger parts that are hung on hooks and immersed in the bath. We have tanks with dimensions of 1000 mm x 400 mm x 900 mm, which allows us to coat larger parts of various shapes and sizes. This method is particularly useful for parts that require precise coating and excellent finish quality.

 

Technical Parameters

Our standard coating thickness ranges from 6 to 10 µm, but we can adapt to the individual needs of the customer. We offer weakly acidic zinc coating and finishing with silver (blue, white) passivation, which additionally improves the aesthetics of the products.

 

Variety of Passivations

To increase corrosion protection and improve the surface appearance, we use various types of passivation containing safe trivalent chromium:

Thin-layer white (silver, blue) – Gives the surface an elegant, silver appearance, often used in decorative and functional elements. Thick-layer – As the name suggests, it has a thicker protective layer and a yellowish iridescent hue. Additionally, it is possible to apply a sealant, which provides even better anti-corrosion protection, increasing the durability and resistance of the zinc coating.

 

Summary

Galvanic zinc coating is an indispensable part of production processes in the metal industry. By applying modern zinc coating technologies and high-quality chemicals, we are able to provide our customers with products of the highest quality, durability, and aesthetics. The ability to use both barrel and rack plating allows us to coat various sizes. Regardless of the order size, we always adjust the technical parameters to individual needs, guaranteeing satisfaction and longevity of our products.


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