Rivestimenti e protezioni anticorrosione
Introduction
Application Methods
Galvanic corrosion
Protection principles
Coating performance
Coatings offered
 
Coatings and anticorrosion protection / Measurement of coating performance

In practice, the effectiveness of a finish is expressed in terms of its resistance to corrosion. This resistance is in turn expressed in terms of hours of exposure, in accordance with standardized tests known as ’salt spray tests’.
The salt spray test entails the exposure of surface treated workpieces to a salt spray chamber in which a controlled aggressive saline environment reigns.
Resistance to corrosion is expressed in terms of the number of hours without the appearance of white rust, and then red rust.

White rust (WR):

White rust corresponds to the corrosion of the zinc layer.

 

Red rust (RR):

Red rust corresponds to the corrosion of steel – in other words, where no coating remains on the steel.

Revêtements - Rouille Blanche

Carré Violet Optional top coat (electrolytic or flake galvanizing)
Carré Bleu Passivation (electrolytic galvanizing)
Carré Orange Zn coating (sacrificial protection)
Carré Gris Steel substrate
Carré Jaune White rust (corrosion of zinc)
Carré Rouge Red rust (corrosion of steel)

Revêtements - Rouille Rouge

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