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What is Powder Coating?

  • 6 min read

Powder coating represents a pivotal development in industrial and commercial finishing technologies. Originally introduced in the 1960s, it has matured to become a mainstream finishing method offering numerous advantages in durability, aesthetics, and environmental compatibility over its conventional liquid paint counterparts. This technique, also known as dry finishing, has found application across various industries, with one of its most common uses being alloy wheel refurbishment. This article aims to answer the question: “what is powder coating?”, covering the concept of powder coating and delving deeper into its application in the refurbishment of alloy wheels.

What is Powder Coating?

Powder coating is a type of coating that is applied as a free-flowing, dry powder. Unlike conventional liquid paint, which requires a solvent to keep the binder and filler parts in a liquid suspension form, powder coating is typically applied electrostatically and is then cured under heat or with ultraviolet light. The powder may be a thermoplastic or a thermoset polymer. It offers a hard finish that is generally tougher and more resilient than conventional paint.

This coating process involves three main steps: preparation or pre-treatment, powder application, and curing. Pre-treatment entails the removal of oil, soil, lubrication greases, metal oxides, and other impurities from the surface. This is often achieved using chemical or mechanical methods. Next, the powder is applied using an electrostatic spray deposition (ESD) method. Finally, the coating is cured in an oven, causing it to melt, flow, and form a hard, durable finish.

The Benefits of Powder Coating

Powder coating offers a myriad of benefits that make it a preferred choice for a variety of finishing applications. The resulting surface finish is known for its exceptional durability, offering improved resistance to scratching, chipping, fading, and wearing compared to traditional paint.

From an environmental standpoint, powder coating is a green alternative. The process generates negligible volatile organic compounds (VOCs), making it more environmentally friendly compared to liquid paints. Also, the excess or oversprayed powder can be collected and reused, thus reducing waste.

Powder coatings also provide an attractive finish with a wide array of available colours and effects, including glossy, high gloss, satin, matte, and textured finishes. The uniformity and consistency of finish achieved are superior to those of traditional painting methods.

The use of powder coatings isn’t restricted to a specific type of material. While most frequently used on metal objects, it’s also suitable for other materials that can endure the curing process, including medium-density fibreboard (MDF) and glass.

Powder Coating and Alloy Wheel Refurbishment

Now let’s focus on a practical application of powder coating: alloy wheel refurbishment. Alloy wheels are renowned for their aesthetic appeal, light weight, and improved heat dissipation. However, they are also prone to damage from curb scratches, corrosion, impact damage, and general wear and tear.

In the wheel refurbishment process, powder coating provides a finish that not only enhances the appearance of the wheels but also offers superior durability and resistance to damage. The refurbishment process typically involves the following steps:

  1. Wheel Inspection: The alloy wheel is inspected for any damage. This could be anything from small scratches and dents to large cracks.
  2. Wheel Repair: Any detected damage is repaired. Small dents and scratches can be filled, while cracks need welding.
  3. Preparation: The wheel is stripped of old coatings, then cleaned and prepared for powder coating. The wheel’s surface must be free from grease, dirt, rust, and old paint to ensure the powder coating adheres properly.
  4. Powder Coating: The wheel is then powder coated using an electrostatic spray gun. The powder is applied in a uniform layer over the entire surface of the wheel.
  5. Curing: The coated wheel is placed in a curing oven. The heat causes the powder to melt and flow, forming a hard, smooth, and durable finish.
  6. Cooling and Inspection: After curing, the wheel is allowed to cool before a final inspection is carried out.

What is Powder Coating? – Conclusion

Powder coating has revolutionised the finishing industry, offering a durable, attractive, and environmentally friendly alternative to traditional paint. It has found significant application in the alloy wheel refurbishment sector, where it adds longevity, aesthetic appeal, and resistance to wear and tear for the wheels. If you want a long-lasting, durable, and visually stunning finish for your alloy wheels, powder coating is undoubtedly a technique to consider.

How North Coat can Help

North Coat provides an end-to-end powder coating service that delivers superior results, offering an assortment of finishes and colours to meet your specific needs.

Utilising the latest technology and adhering to the strictest quality standards, we ensure that every product receives a flawless, uniform finish that is both aesthetically pleasing and incredibly durable. Our team of experienced technicians are proficient in handling a variety of materials, ensuring that your items, whether alloy wheels, industrial parts or metal furniture, receive the best possible treatment.

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