What is powder coating?

It is a dry coating composed of resin particles, pigments, and additives, applied electrostatically and then oven-cured, forming a solid, solvent-free film.

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What are the main advantages over liquid paint?

• Higher yield (almost 100% powder utilization).

• Lower VOC (volatile organic compound) emissions.

• More resistant coating to corrosion and wear.

• More uniform, drip-free finishes.

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What types of surfaces can be powder coated?

Primarily metals (steel, aluminum, cast iron), although there are also solutions for plastics and special woods with appropriate primers.

 

How is the part prepared before painting?
A pretreatment process is carried out, which includes:

• Degreasing and chemical or mechanical cleaning.

• Rinsing to remove residues.

• Chemical conversion (phosphating or pretreatment with zirconium salts) to improve adhesion and corrosion resistance.

 

Can this process be performed on-site?

No. This process requires several specialized pieces of equipment:

• A booth with an electrostatic spray gun.

• Compressed air blowers.

• A dust recovery system and cyclones for excess powder.

• Washing and/or pretreatment of the part.

• A curing oven that raises the metal temperature to between 160°C and 220°C for approximately 10 minutes.

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How is the coating thickness controlled?

An induction thickness gauge is used after application. This thickness is controlled by adjusting the application parameters and methods on the spray gun.

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What does the curing process involve, and what are its parameters?
The part enters an oven at temperatures between 160°C and 240°C for a specific time. A thermal profile (ramp, holding, and cooling) is followed to ensure the fusion, flow, and crosslinking of the coating.

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Can the leftover powder be recycled?

Yes. The collected powder is evaluated (checking for contamination and fusion properties) and, if it meets the standards, it is reintroduced into the process, reducing waste and costs.

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What are common defects and how can they be avoided?

Blisters: Excessive moisture or contamination during pretreatment.

Orange peel: Inadequate curing or poor powder flow.

Peeling: Lack of adhesion due to poor pretreatment or insufficient curing.

Clumps: Foreign particles or paint contamination.

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How does ambient temperature affect the process?

Cold or humid environments can cause condensation on the part, affecting the coating quality.