The alkaline zinc-iron alloy coating
The alkaline zinc-iron alloy coating is very commonly applied to steel and ferrous materials. It has been used successfully for many years in the automotive and electrical industries, in equipment and mechanical engineering and also in sheet metal processing.
It is characterised by a higher resistance to environmental influences.
In addition to the classic galvanising process, the zinc-iron process provides a high degree of corrosion protection paired with an attractive surface design (black, silver), as well as uniform coating thickness distribution. This is a crucial advantage for workpieces with fit sizes.
This process is suitable for both barrel and rack goods.
Properties and applications
- High ductility (softness) of the surface (bending and flanging properties)
- Coating thickness 3-20 μm adjustable (also in accordance with specifications. Higher also possible on request)
- The iron integration rate is between 0.15% to 1%, depending on requirements
- Increased temperature resistance up to 120 °C
- Environmentally friendly, since CrVI-free
- High long-term corrosion resistance in accordance with DIN EN ISO 9227 - NSS - 360 h without white rust - 600 h without red rust
- The special processes used by mbw even reliably achieve values of at least 1000h in the salt spray test compared with white rust with coating thicknesses of 10 μm zinc
- The zinc coatings can be treated in various ways by special post-treatment, for example passivation, phosphating, painting, vulcanisation, dyeing and sealing
- Improvement of corrosion properties by post-treatment with topcoats, adjustable coefficient of friction
- Passivation (thick coating, silver, blue, black)
- Sealing with and without lubricant
- Heat treatment for hydrogen de-embrittlement (annealing)