When applying coatings of any kind, the first phase and the phase of crucial importance is the preparation of the substrate. FLAMEX coating is applied to metal structures either externally or internally on an anti-corrosion coating (primer).
The primer itself must be compatible with FLAMEX. Primer application is performed on a previously prepared substrate (degreased, flat, without traces of rust, dust particles and others).
Before applying FLAMEX, check that the surface is dry and clean of grease, dust, traces of oil and other impurities that could endanger the adhesion of the fire protection coating (hereinafter PP).
The entire amount of steel brought to the required condition, ie physically cleaned, dry and free of mud, concrete residues, grease, zinc salts and other impurities. In some cases, it is necessary to wash the entire steel structure. If contamination in the form of oils and fats is present, it is necessary to use appropriate means to remove them. Organic solvents (paint thinners) should not be used to degrease or prepare the surface for the application of PP coatings as there is a risk of degradation of FP components of the thinner.
Standard compatible primers
FLAMEX can be applied to the following anti-corrosion primers:
- Alcaloid primer
- Alcid modified primer
- Vinyl acetate primer
- Two-component epoxy
- Zinc silicate (inorganic zinc)
Galvanized steel structures
The process of "galvanizing" involves the application of a protective layer of zinc on steel or iron in order to prevent corrosion. The usual method is the so-called "hot dip galvanizing" when steel elements are immersed in molten zinc. After the galvanizing process, the steel has a light surface where there is a layer of pure zinc. This surface is usually smooth so that in 24 to 72 hours after galvanizing it is enough to make the surface slightly rough in order to prepare it for the application of FP coatings.
Adhesion between the coating and galvanized steel is always good if at least one year has passed since the galvanizing process, because the corrosion products of zinc form a very thick, insoluble protective layer that easily accepts the coating layer.. In contrast, a freshly galvanized layer may have adhesion problems during the first 24 to 72 hours after the galvanizing process.
Prior to coating, freshly galvanized steel should be clean, dry and free of any impurities, including zinc salts and all chromium solutions.. This can be achieved by using a suitable detergent and / or special mixtures for treating and degreasing metals; they should also be removed with clean water before applying any protective coating. In case of damage to the surface protected by the primer, all loose parts should be thoroughly cleaned with a steel brush and removed before the surface is restored to its original condition by applying a new layer of primer.
FLAMEX can be applied directly to galvanized steel, but in the case of freshly galvanized steel (as highlighted) or high humidity conditions, it is recommended to apply an adhesive primer.