Galvanised steel with a coating that meets the code of practice described in this publication has a long service life, provided it is maintained correctly.
Periodic cleaning can significantly extend the service life and preserve the aesthetic appearance. Dirt causes the surface to lose its gloss.
Concentrations of dirt and streaking reinforce this effect. By periodically removing the contamination, you prevent the chemical substances present in the dirt from attacking the coating.
Salts and other aggressive substances in particular cause accelerated ageing of the coating system. In addition, thick layers of dirt can absorb and retain more moisture, which increases the aggressive effect on the coating layer.
In a wooded environment, the coating can become soiled by algae growth, for example.
Deposits of iron or copper particles from rail traffic also cause contamination. On the coast, it is mainly chlorides (salt) that attack the coating system.
In urban and industrial environments, the coating is soiled by its surroundings every day. In addition to this specific contamination, fine dust also settles daily, lodging in corners and crevices and adhering to the coating there.
Correct and timely cleaning of the surface is essential for preserving the coating system and extending its service life.
CLEANING: METHOD AND FREQUENCY
Cleaning the coated surface requires specialist knowledge, in particular of: the nature and degree of soiling cleaning equipment cleaning method cleaning agents accessibility the design of the object.
For large-scale projects, it is advisable to draw up a sound maintenance plan with specific cleaning procedures together with the parties involved right from the start.
After all, preventive maintenance stops incipient defects in the coating and allows you to safeguard the safety and performance of the installation/objects. This avoids costs and consequential damage.
Moreover, a maintenance plan is often an integral part of the warranty conditions between the parties involved. It is the task and responsibility of the cleaning company to advise on the most effective method for each situation.
A standard cleaning plan drawn up in advance is usually sufficient, such as: removing coarse dirt by hosing down with tap water; misting/spraying with a pH-neutral cleaning agent and leaving it to act; manually loosening the dirt from the surface with a soft cloth, brush or sponge (no scouring pad); then rinsing thoroughly with tap water.
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