TPI May 2013

products & developments Continuous zinc plating

and besides corrosion protection these coatings have an additional significant function – they improve the aesthetic look of the product. Zeleziarne Podbrezová is able to meet the above requirements for passivation without using CrVI. For continuous zinc plating and tube passivation with outside diameter range 4 to 42mm and wall thickness range between 1 and 5mm, the company has a process line that is able to process two tubes at the same time. The company zinc plates seamless tubes of E235+N and E355+N standards. The length of the incoming tubes ranges from 4 to 6 metres, and the zinc layer thickness ranges from 8 to 30µm. The passivation type is thin or thick layer passivation without CrVI. The company can apply silicon-based sealing (Finseal) to tubes, to stabilise the chrome layer. Zeleziarne Podbrezová as – Slovakia admin@zelpo.sk www.steeltube.sk

protected against corrosion. One of the possibilities to protect surface of base material is the electrolytic (galvanised) deposition of metal coatings that prevent corrosion of the surface.

Precision steel tubes destined for hydraulic and pneumatic pressure pipes form a significant share of the overall volume of precision tubes produced. In commercial use these types of tubes are referred to as HPL tubes.

The surface does not usually consist of just one layer, but of multiple layers,

The surface of these tubes must be

Zinc plating by Zeleziarne Podbrezová