PreTreatment

The application of a powder film provides two main criteria:

It protects the substrate onto which it is applied and it makes your product look better.

With this in mind it is crucial that the correct pre-treatment and powder technology is chosen. When you are putting your name to a brand or product it is critical that sub suppliers in the manufacturing process can sustain your needs through quality, service and technical support and an understanding of what you are trying to achieve.

In this ever demanding economy it is clear that we must strive to offer solutions that take account of cost, resource depletion, longevity and health and safety.

The foundation to any good quality coating is the pre-treatment. This is because powder, as a cured film, is actually permeable. The solid cured film contains many millions of micro pores which allows moisture to permeate through the film which can potentially bring on the onset of corrosion of the substrate from beneath the powder coatings.

To ensure longevity of the coating it is thus incredibly important to ensure that the correct pre-treatment has been selected.

Euro Quality Coatings offer 2 methods of chemical pre-treatment. Both are applied via a 56 metre long 11 stage pre-treatment system which applies the pre-treatment via a series of high pressure sprays.  In this manner the chemical or rinse water impinges itself onto the surface of the substrate. The benefit of this system is the lack of operator intervention from the time of initial loading onto the overhead conveyor, to the time the part is fully processed and inspected at the process completion. This eliminates any risk of damage whilst basket loading but, more importantly, negates any risk of contamination to the part from operator handling.

Chromate Pre-treatment

Chromate is a chemically bonded impervious film that is applied to Aluminium Substrates prior to powder coating.

The chromate system adopted by EQC conforms fully with the requirements of BS6496:1984 (superseded by BS EN 12206) and is fully audited by our process controllers throughout the production day. Furthermore our pre-treatment supplier has full access to the plant and conducts a fortnightly audit of the plant to ensure all working parameters are being met. It is free of harmful chrome VI following processing and meets all current WEEE and VEL regulations.
  The Aluminium is initially processed via an Acid etch cleaner which removes surface contamination and microscopically etches the surface of the substrate in preparation for the chromate conversion layer. After acid cleaning the part is subject to two pressurised towns’ water rinses before entering the chromate zone. Following chromate conversion a further two towns water rinses are sprayed onto the part prior to a final rinse in demineralised water. This demin rinse ensures that the part is completely free of water contaminants prior to force dry off through a gas fired convection oven.

By applying this chromate conversion layer, the long term corrosion resistance of the part is ensured and enables Euro Quality Coatings to offer a range of Architectural warranties, currently up to 30 years, based on the end location of the part processed. Euro Quality Coatings are the only such approved applicator in Wales able to offer such warranties.

Phosphate Pre-treatment

Where the substrate is of a ferrous base we adopt an Iron Phosphate pre-treatment route. This again provides a chemically bonded pre-treatment layer which protects the substrate from future corrosion attack under the powder coated film.

Our Phosphate conforms to BS3189 and is, in line with the chromate pre-treatment route, fully audited.

The ferrous substrate is initially processed via an alkaline cleaner which removes surface contamination and oils from the surface of the substrate in preparation for the phosphate conversion layer. After alkaline cleaning the part is subject to two pressurised towns’ water rinses before entering the phosphate zone. Following phosphate conversion a further two towns water rinses are sprayed onto the part prior to a final rinse in demineralised water.

We hope the above narrative gives some degree of useful information. Should you require any further technical assistance regarding your powder coating requirements then please feel free to get in contact with us.