Carbon Steel and Stainless Steel
Stainless steel, also known as inox steel differs from carbon steel by the amount of chromium present. Carbon steel rusts when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion and blocks the corrosion from spreading into the metal’s internal structure.
Galvanizing is an anti-corrosion treatment in which the products are covered with a thin layer of zinc. Without any damage the surface will last for many years, keeping the details from rusting. When exposed to the atmosphere, zinc reacts with oxygen to form zinc oxide, which further reacts with water molecules in the air to form zinc hydroxide. Finally zinc hydroxide reacts with carbon dioxide in the atmosphere to yield a thin, impermeable, tenacious and quite insoluble dull gray layer of zinc carbonate which adheres extremely well to the underlying zinc, so protecting it from further corrosion.
On our products the zinc protection is combined with the use of powder painting. The powdered paint is electrostatically charged and sprayed onto the part. The part is then placed in an oven and the powder particles melt and coalesce form a continuous film. The combination of a polyester powder coatings top coat and the galvanized surface provides a good aesthetic finish, excellent mechanical properties and outstanding corrosion resistance. The paint will again, on the one hand, protect the zinc surface from outside damage, and on the other hand, gives the products their final great visual appearance.
The final coating is continuous and will vary from high gloss to flat matt depending on the design of the powder by the supplier.
To keep powder coated items looking new and attractive and to reduce overall maintenance costs, an additional protection can be applied on their surface. As a side effect, the lacquer will add gloss, so the final color of a product will not be matt even for matt powder coating option.
The application of anti-graffiti lacquer is done the same way as regular powder painting. Anti-graffiti lacquer is based on polyurethane chemistry which releases a blocking agent during the curing process.
This solution is designed to allow the simple and rapid removal of most forms of graffiti and is recommended for use where resistance to graffiti is required. Typical end uses include train, tram and bus components, bus shelters, telephone boxes, school furniture and play equipment, outdoor park and street furniture, garden furniture, road signs, fencing and public buildings.
EXTERY has brought to the urban furniture field the material which has been mostly used for industrial application. Two-component, high performance aromatic polyurea/polyurethane hybrid spray elastomer system is commonly applied to protect surfaces of intensely used areas like boat decks and van floors.
This substance has excellent thermal stability and good chemical resistance, providing extra protection for the metal. It also creates an interesting surface structure that matches designer products perfectly.
Metal benches are exceptionally practical for urban spaces, but during the cold season their appeal diminishes. Elastomer surface layer makes metal warmer to sit on while protecting the products against corrosion and graffiti. Elastomer-covered bike racks are more resistant to mechanical damages and also avoid scratching the bike’s frame.
For more details on the full EXTERY range please go to the main website