We offer both a galvanized or a galfan coating on all our range. Both coatings are widely accepted globally as suitable coatings for corrosion resistance in outdoor applications.
Galvanised steel products have been around for hundreds of years. The process of galvanising is believed to have been discovered in India in the 4th century AD and was later discovered by Europeans in the 17th century when it had been used as armour for Indian armies. These days, galvanised steel is everywhere. Most commonly used in the construction industry, galvanised products include support beams, piping, heating and air conditioning duct work, barriers and handrails. Galvanized steel is used to make outdoor grates used for industrial walkways street lights, beds, washtubs, buckets, nails, planter boxes and of course, gabion baskets.
Galvanisation is the process of applying a protective zinc coating to steel, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc. Galvanizing protects in two ways.
- It forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal.
- The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc.
Galfan is zinc-aluminum alloy coating as compared to a pure zinc coating (galvanized). It is generally 95% zinc, with 5% aluminum alloy and mischmetal steel. Galfan offers an excellent level of protection against long term corrosion as the corrosion rate is closer to a parabolic shape rather than linear as per a galvanized finish.
The type of finish most recommended is dependent on the location and expected life span of the project.