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Ing. Pavel Prokeš, Ph.D.
Ing. Pavel Prokeš, Ph.D.
Ing. Pavel Prokeš, Ph.D.
Surface treatment methods

Types of surface treatments

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Aluminum anodizing

Resistance, hardness and abrasion resistance of the material
Anodizing (anodic oxidation) is an aluminum surface treatment that is characterized by excellent corrosion resistance as well as important functional properties, depending on the type of anodizing (hardness, abrasion resistance). The fully automated line with the option of recording the entire process ensures the high quality of anodized parts even in serial production. Hard anodizing in sulfuric acid - anodizing of aluminum and its alloys with a layer thickness of 5 ÷ 100 µm. Possibility of black coloring and sealing.

Natural anodizing in sulfuric acid (decorative) - colorless anodizing of aluminum and its alloys or with black coloring, with a layer thickness of 10–25 µm, followed by the sealing of the anodized layer in demineralized water with a special sealing additive.

Anodizing of aluminum and its alloys in chromic acid (chromelox) with subsequent sealing in demineralized water or in a potassium dichromate solution. Min. layer 3 µm.

Properties and colour treatments
The chosen type of anodic oxidation determines the appearance and properties of the surface layer (and thus the purpose of its use). Hard anodizing forms a hard, non-conductive layer with high resistance to mechanical damage.  The type of alloy used and the layer thickness are important aspects that determine the resulting color (shades of brown, olive green, dark gray...). Natural anodizing in sulfuric acid forms transparent, non-conductive layers suitable for decorative applications. The layers formed in hard and natural anodizing can be colored black. Anodizing in chromic acid is particularly useful in the aviation and military industries due to the high corrosion resistance of the applied layer. The resulting layers are light gray and are suitable as a base for subsequent painting. We offer customers anodizing of a wide range of aluminum alloys in different layers.

 
Surface treatment Max. dimensions of parts (mm)
Hard anodizing 1850 x 850 x 550
Hard black anodizing 1850 x 850 x 550
Natural anodizing 1850 x 850 x 550
Natural black anodizing 1850 x 850 x 550
Anodizing in chromic acid 1850 x 850 x 550


Zinc coating

Corrosion protection
In galvanic zin coating, a zinc layer is formed on the surface of the material, which is characterized by excellent corrosion protection. The zinc layer is passivated with blue or yellow passivation (both without Cr6+) to enhance corrosion resistance.
Zinc in an alkaline non-cyanide bath followed by blue or yellow passivation


Nickel coating

High gloss and hardness
Galvanic nickel coating creates a layer with a characteristic high gloss and hardness. These nickel layers are therefore used as a decorative surface layer or as a functional coating with high demands on corrosion resistance and mechanical wear.


Tinning

Resistance to water corrosion and hygienic safety

Glossy tinning results in a highly glossy tin layer on iron, copper and copper alloy parts (bronze, brass). The tin layer gives the base material good corrosion resistance, and improves the solderability and electrical conductivity of the coated parts. The applied tin layer is hygienically safe, which is why it is used in the food industry.


Blackening

Decorative surface treatment
The black oxidation layers formed on steel are mainly used as a decorative finish - e.g. on hunting weapons, optical components, etc. The thickness of the resulting layer is only 0.5 ÷ 0.8 µm, resulting in a minimal protective effect even in a normal atmosphere. It is therefore necessary to impregnate the resulting layer with a suitable preservative.
Blackening on hinges.  The fully automated line with the option of recording the entire process ensures the high quality of parts even in serial production.

 
Surface treatment Max. dimensions of parts (mm)
Galvanic nickel coating 1200 x 750 x 350
Galvanic tinning 1200 x 750 x 350
Zinc coating with blue and yellow chromate 1200 x 750 x 350
Blackening 1200 x 650 x 350

 

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Continuous operation, high capacity and time efficiency
Continuous operation, high capacity and time efficiency
The qualified and responsible staff of our galvanizing shop contributes to the highly efficient process of our galvanic coatings of aluminum, steel, stainless steel and copper.
Thorough monitoring of orders
Thorough monitoring of orders
Thanks to regular and ongoing order inspections, our surface treatments are characterized by their high precision and quality.