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Powder Coating Surface

Powder coating is a surface finishing technique wherein the surface of the metal or material is coated with dry powder paint, which is subsequently cured at high temperature for a certain period of time resulting in the formation of a hard and tough uniform protective layer.

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Process

1. Surface Cleaning (Degreasing/Cleaning)
Removes grease, oil, dust, and other impurities from the steel surface.
Common methods include alkaline cleaning, solvent wiping, or ultrasonic cleaning.

2. Surface Preparation / Abrasive Blasting
Steel surface is roughened using sandblasting or shot blasting to remove rust and mill scale.
Improves adhesion of the powder coating to the substrate.

3. Rinsing / Drying
Rinses off residues from blasting and cleaning.
Surface is dried thoroughly to ensure powder adhesion.

4. Pre-Treatment / Primer Application (Optional)
Applies a conversion coating or primer (e.g., phosphate or chromate-free primer) to enhance corrosion resistance and powder bonding.

5. Powder Application
Electrostatically sprays dry powder (thermoplastic or thermoset) evenly onto the steel surface.
Electrostatic charge ensures the powder adheres uniformly to the substrate.

6. Curing / Baking
Steel parts are heated in a curing oven (typically 160–200°C) for a specified time.
Powder melts and forms a smooth, continuous, durable coating.

Feature

  1. Excellent corrosion resistance: The powder coating provides a protective barrier against moisture, chemicals, and UV exposure.

  2. Long-lasting finish: Maintains color and surface integrity for many years, suitable for indoor and outdoor use.

  3. Strong adhesion: Bonds tightly to properly prepared steel surfaces, reducing the risk of peeling or chipping.

  4. Low maintenance: No need for frequent repainting, cleaning is simple and convenient.

  5. Environmentally friendly: Free of solvents, minimal VOC emissions, and fully recyclable.

Application

1. Building and Structural Engineering
Steel structures, bridges, factories, staircases, railings.
Provides long-lasting color and corrosion protection for indoor and outdoor environments.

2. Transportation Facilities
Highway guardrails, traffic signal poles, railway fittings.
Resistant to UV, moisture, and chemical exposure, ensuring durable performance in high-traffic areas.

3. Power and Communication Equipment
Iron towers, light poles, transformer supports.
Enhances weather resistance and maintains aesthetic appearance over time.

4. Industrial and Residential Equipment
Machinery, shelving, furniture, and home appliances.
Offers a smooth, durable finish that resists scratching, chipping, and fading.

Summary

Powder coating is an environmentally friendly high quality metallic surface treatment, with durability and aesthetics and the environmental benefits has become a popular protective treatment for modern steel constructions and metal products.

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