galvanizing

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Alternatively, you may want to contact directly one of our locations or our holding company.

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Contact Holding company

Headquarter
The Coatinc Company Holding GmbH

Carolinenglückstraße 6-10
44793 Bochum, Germany
Phone: +49 234 52905-25
Fax: +49 234 52905-15

Your contact person:
Silke Sandmeier
E-Mail: holding@coatinc.com

If you wish to talk to our management team, please get in touch with one of our points of contact, who will take care of any request which goes beyond pure surface finishing.

Marketing

The Coatinc Company Holding GmbH
Carolinenglückstraße 6-10
44793 Bochum, Germany
Phone: +49 2732 796-0
Fax: +49 234 52905-15

Your contact person
Diana Posner
d.posner@coatinc.com

Press

The Coatinc Company Holding GmbH
Steinstraße 5
57072 Siegen, Germany
Phone: +49 271 43478
Fax: +49 271 46869

Your contact person:
Petra Böhmer
p.boehmer@coatinc.com

Passivation – gloss preservation in hot-dip galvanizing

Passivation significantly slows the chemical reaction of zinc with substances in the environment. Passivation layers therefore improve the corrosion behaviour of the zinc coating. In practice, white rust can only become a problem in the case of freshly galvanized parts, as no protective topcoats have formed yet. Seasonal effects also play a role due to the fact that moisture plays a major part. White rust develops more frequently in the autumn and winter, due to frequent rainfall, fog and temperatures falling below dew point, encouraging the formation of white rust.

Better than packaging – Passivation and passivate

Stacking freshly hot-dip galvanized components in wet grass, unfavourable locations or lying flat on top of each other can lead to white rust under intense exposure to moisture. While well intentioned, covering galvanized steel components stored outdoors with tarpaulins or plastic sheets usually does more damage than good. Moist air accumulates under the cover and turns into condensation water in moisture-saturated air – an ideal climate for white rust.

Long-term protection against white rust

Packaging is only useful if it is undamaged and no moisture can penetrate the packaging. White rust problems are particularly likely in the case of galvanized bulk materials such as screws and nails stored in damp wooden boxes or open containers outdoors. The formation of white rust is not associated with the galvanizing process and is not a measure of the galvanzing quality. In fact, this is a phenomenon that is very much dependent on weather conditions during storage and during the transportation of freshly galvanized parts.

Technical features of the passivation

  • Effective white rust protection, particularly in the case of outdoor exposure
  • Excellent temporary corrosion and weathering protection
  • Free of chromium and organic solvents
  • Food safe in the case of indirect contact
  • With standard pre-treatment, coatable and suitable for all conventional duplex coatings

All services at a glance

  • Optimal advice
  • Material preparation
  • Surface finishing
  • Secondary operations
  • Quality management
  • Packaging
  • Large projects
  • Express delivery
  • Export handling
  • Customized logistics solutions

Passivation – explained in 60 seconds

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