Powder coating as a process involves coating a surface where powder is applied using compressed air method, electrostatic method, and sometimes fluidised bed method. To achieve the coating process, the applied material in powder form is heated using an oven to attain its melting point. At this point, the powder is able to flow forming a smooth film that firmly dries. The result is a durable finish that is resistant to peeling, cracking, rust, scratches, and UV rays. To learn more this, have a look at the simple steps that are involved in the powder coating process.
The pre-treatment step
The pre-treatment step takes place before the actual process of powder coating. It involves the removal of any lubricant greases, oily substances, dirt particles, and metal oxides from the surface to be coated. Different pre-treatment methods exist depending on the type of material, the nature of impurities being removed, and the size of the surface to be coated. For grease and oil substances, you might think of using chemical solvents such as chromates and phosphates, to ensure they are completely dislodged from the surface. Surfaces like magnesium and aluminium can be wire brushed or sanded. For instance, sand blasting can be applied to a metal surface to be coated to a bare metal state. During coating, treat the pre-treatment stage with care as it cleans the surface and betters the bonding process of the powder.
Powder application process
The step involves application of the powder coat to the surface mainly done using a compressed air sprayer or a gun. The powder material is charged electrostatically to make it stick on the surface receiving the coating. Various types of spray nozzles exist depending on paint consistency and the specific shape of the object being painted. The step is also crucial as it determines how effective the coat will stick to the surface receiving the paint.
The curing process
This is basically the last stage where the surface is cured at a temperature convenient for the powder material used. It can be done using an infrared heat lamp, a conventional oven, or other types of flames that produce less heat. Smaller items are best powder coated using a conventional oven. In addition, it is advised not use an oven for cooking purposes after is has been used for powder coating.
Take time to exercise these simple steps to save you some bucks. Be a DIYer today to avoid running for professional help on simple painting tasks.Share