R&M POWDER COATING

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The powder coating process

Three steps to powder coating your product


Here at R&M Powder Coating, we’re proud to apply state of the art coatings for both commercial and domestic powder coating clients.

We use the latest electrostatic powder coating technology which means we can take on large volumes of powder coating for your convenience. We use three effective steps to thoroughly clean and effectively treat all appliances:


1. Pre Treatment

The effective powder coating pre-treatment of all appliances: We’re capable of robustly removing heavy dirt and granules through a tried and tested process of abrasive blasting. Read more..

2. The electrostatic powder coating itself:

We blow particles of powder through an electrostatic gun using compressed air at the components charging the powder particles to approximately 80 Kv. Because the component is earthed the powder is attracted using the electrostatic process to the component. Read more..

3. Curing

The curing process is essentially what creates the finished layer of skin. After electrostatically treating the components, they are then heated to a specified temperature to create a sleek and professional finish. Read more..

Part preparation processes and Pre-treatment

Removal of oil, dirt, lubrication greases, surface contamination etc, is essential prior to the powder coating process. It can be done by a variety of chemical and mechanical methods. The selection of the method depends on the size and the material of the part to be powder coated, the type of impurities to be removed and the performance and specification that customers require of the finished product.


Chemical pre-treatments at R&M involve the use of alkali cleaners, phosphates, which can be nickel, titanium, zirconium or silanes based (R&M uses most of these technologies) and they offer similar performance against corrosion and enhacned adhesion of the powder. The treatments can be applied by submersion or spray. These often occur in multiple stages and consist of degreasing, various rinses and the final phosphating of the substrate. The pre-treatment process both cleans and improves bonding of the powder to the metal.

Powder application processes

The most common way of applying the powder coating to metal objects is to spray the powder using an electrostatic gun (Corona). The gun imparts a positive electric charge typically 80Kv to the powder, which is then sprayed towards the grounded object by compressed air and then accelerated toward the workpiece by the electrostatic charge in the powder. There are a wide variety of spray nozzles available for use in electrostatic coating. The type of nozzle used will depend on the shape of the workpiece to be painted and the consistency of the powder. The object is usually pre heated in the drying oven, used to drive off excess water and moisture from the pre-treatment process. The powder then melts into a uniform film in the curing oven and is then cooled naturally to form a hard coating.

Curing

When a thermoset powder is exposed to elevated temperature, it begins to melt, flows out, and then chemically reacts to form a higher molecular weight polymer. This cure process, called crosslinking, requires a certain temperature for a certain length of time in order to reach full cure and establish the full film properties for which the material was designed. Normally the powders cure at 200 °C for 10 minutes.

We pride ourselves on producing an excellent quality product.
Please feel free to get in touch on 01384 898765 for a quote and see how we can help your business.