Oberflächenbeschichtung und Antikorrosionsschutz
Introduction
Application methods
Galvanic corrosion
Protection principles
Coating performance
Coatings offered
 
Coatings and anticorrosion protection / Protection principles

Sacrificial

The coating corrodes rather than the substrate, because the coating is less ‘noble’ than the substrate. If the coating is locally damaged down to the substrate by scratching or scoring, the substrate will remain protected as long as it is adequately surrounded by the coating.

 

Barrier

The coating is nobler than the substrate – it is therefore extremely resistant to corrosion. If the coating is locally damaged down to the substrate by scratching or scoring, the coating will no longer protect the substrate, which will immediately become corroded.

Revêtements - Principes de Protection

In the event of electrolytic galvanizing with a chrome trivalent (Cr3) based passivation, the passivation creates a protective barrier of zinc (chrome being nobler than zinc) and the zinc plating creates a sacrificial protection for the steel (zinc being less noble than steel).

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