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ZINC PLATING

We provide galvanization in weakly acidic and alkaline electrolyte. These electrolytes are in these days most popular technologies of galvanizing. They provides a high gloss surface with a thin and ductile layer.

GALVAN CZ s.r.o. performs galvanizing without passivation or with blue, thick-film or yellow passivation. All passivations are CrVI-free and are based on CrIII solutions. For all types of finishes we offer different kinds of sealings and top-coats.

Zinc plating is performed on a computer-controlled automatic lines with traceability of all parameters of the plating process.

RACK ZINC PLATING

Maximum dimensions of parts up to: 1800 mm x 300 mm x 1050 mm

BARREL ZINC PLATING

Barrel plating maximum capacity is 80 kg per one barrel.

Maximum dimensions of parts up to 150 mm and a weight of 0.3 kg

Coating thickness

Standard thickness of zinc coating is 8-15 µm. We adjust thickness according to customer requirements, but only up to 35 µm.

Suitable materials

Iron, steel and cast iron products are suitable for galvanizing. The quality of the input material fundamentally affect the appearance of plated parts.

Zinc coating passivations

In order to improve the corrosion resistance the zinc layer is passivated with one of the Cr3+ passivations.

Thin-layer passivation Cr3+: (blue) 0.08-0.1 µm on zinc layer. It is used for parts that are less exposed to corrosion.

Thick-layer passivation Cr3+: (slightly iridescent appearance) 0.2-0.3 µm on zinc layer. Higher corrosion resistance comparable to yellow chromate. The advantage is that it doesn’t contain Cr6+, but it doesn’t have the self-repairable effect in case of passivation is eroded. It is used as a substitute for yellow chromate.

Yellow chromate Cr3+: (yellow, rainbow like appearance) 0.2-0.5 µm on the zinc layer. Higher corrosion resistance.

The organic sealing

To improve the corrosion resistance, varnishing can be used as a next step of surface treatment. The varnish is applied in a 2-4 µm layer. If this varnish is applied on thin- or thick-layer passivation, after dry out, it creates a transparent organic film. This film increases not only the corrosion protection, but also abrasion resistance. On yellow chromated varnish coatings it suppresses iridescent appearance and gains uniform yellowish hue.

For surface treatment we use chemicals from suppliers Schlötter, Atotech, Coventya and Metallchemie.

SPECIFICATION OF THE REQUIREMENTS FOR ZINC PLATING

Requirements for surface treatment are set out in the relevant ISO-DIN standards. GALVAN CZ s.r.o. performs metal surfacing according to global standards for automotive engineering or according to customer specifications.

PRICE

The price is individual and depends on used technology, area of processed parts,  weight of one part, annual quantity and total volume of orders.

new website www.galvan.cz

Company GALVAN CZ s.r.o. has launched its new website.


Our company GALVAN CZ s.r.o. was founded in 1998. Main scope of our business is surface treatment of metals by zinc galvanization, phosphating, varnishing(including PTFE Teflon) or by Deltacoll varnishing. Supreme quality of the surfacing enhances product basic characteristics and their competitiveness on the market. 90% of our production goes to customers in the automotive industry.

PHOSPHATE COATING

Phosphating is a coating method which creates the insoluble phosphate layer on the surface of product. The crystalline layer is electrically nonconductive and insoluble in water or organic solvents. It has very good cohesiveness with base metal and it is suitable as an undercoat layer before painting and coating application. Phosphating protects from corrosion if products are additionally treated with oil, wax or other way. It also facilitates cold pressing.

Effects of phosphate coating

Corrosion protection of steel components in combination with impregnation by oil, grease or wax.

Friction reduction during cold pressing of steel items. Hot reactive soap application is part of the process preparation.

Friction reduction during running-in of steel shafts, sprockets, bearings, etc.

Improved coating adhesion to the metal surface and corrosion prevention when damage coating is damaged.

Phosphate coating technology

Currently we these phosphating technologies:

  • rack phosphating
  • barrel phosphating
  • phosphating in baskets

Types of offered phosphates:

Manganese phosphate coating is mainly used for coating of rotating gears, because it facilitates the running-in of rotating mechanical parts and reduces towing friction.

Thick-layer zinc phosphate for cold forming with desired sliding properties or for preservation.

Thin-layer zinc phosphate for further painting.

Due to the quality that our customers demand, we use the phosphating and subsequent impregnation by Henkel products.

COATINGS

GALVAN CZ s.r.o. also offers manual application of technical coatings.

The painted surface is pre-treated by blasting and/or in some cases by phosphating.

Painting is carried out in the paint box of dimensions 6x4x3.5m with the following types of products:

  • synthetic
  • acrylate
  • two-component

The company GALVAN CZ s.r.o. specializes in the application of PTFE fluoroplastic coatings, painting with technical plastics (XYLAN) and MOS2 (molybdenum sulphate sliding) coatings.

PTFE – polyfluoroethylene

MOS2 – sliding coatings based on molybdenum sulfate

Technical coatings are widely used in automotive, chemical, food, OIL, paper and plastics industries.

 

Their main advantages are:

  • Excelent corrosion resistance
  • Abrasion resistance
  • Improved mechanical characteristics
  • High temperature resistance
  • Chemical resistance
  • Extension of the parts life

BLASTING

High pressure blasting of steel materials is part of the surface preparation for further technological operations, such as phosphate coating, varnishing or galvanizing.

We perform blasting by pressure blast system with a jet, which is most suitable for the preparation of metal surfaces in the blasting box with dimensions 5.8 x 2.2 x 2.3 m. As blast abrasive we use corundum grit.

Blasting is used as one of the most effective methods to remove rust, paint, oxides and other impurities from the basic materials.

The surface roughness after blasting is measured by roughness meter or by reference standard.