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What’s The Difference Between Powder Coating And Painting?

  • Author:Doris Xu
  • Release on:2018-03-20
Sometimes people thought the surface of powder coating and painting is so similar. What’s the difference between them?Let’s compare them from the processing.

Powder coating utilizes a high voltage electrostatic field to make galvanic coating particles move in the opposite direction of the electric field. Then the powder is adsorbed on the surface of the workpiece.

* Pre-surface treatment of steel, such as degreasing, surface conditioning, hot dip galvanizing, cleaning, phosphating, and drying. It can remove rust and impurities, not only remove the susceptibility of steel rust, but also to produce a zinc layer and phosphate film on the surface of the steel. The zinc layer protects the steel against corrosion and rust. The phosphating film provides stronger powder adhesion when the steel surface is powder coated.

* After the preliminary processing is completed, a device composed of a spray gun, a spray cup, and a high-voltage power supply for spraying is used. The negatively charged paint particles are subjected to directional motion in the opposite direction of the electric field using a high-voltage electrostatic field, and are then adsorbed on the surface of the steel to be coated. A high-performance electrostatic spray machine is used for spraying, and electrostatic shielding is used to achieve powder adhesion. The powder coating on the surface of the steel is heated to a prescribed temperature (180°C-220°C) and held for a corresponding period of time to melt, level and solidify, thereby obtaining the desired surface effect.

The surface of powder coating is bright, smooth, and can achieve special coverage and feels. It’s not easy to fall off, and has excellent weather resistance. A streamlined production was achieved, and the investment in product quality and labor costs was improved.


* Pre-surface treatment of steel is also required. The general processing is: Pickling (or shot blasting) - Degreasing - Phosphating - Washing - Natural drying - Putty - Priming - Spraying - Natural drying.

* The traditional middle coating and topcoat lines adopt manual air spraying technology and generally use non-pipelined operations. They are sensitive to external climate and cannot be constructed on rainy days and suitable for multi-species and low-volume production.

Painting process is more flexible than powder coating with respect to production site requirements, but the effect is relatively rough, the weather resistance of the layer is short, and excess paint flow cannot be recycled to become environmental pollution.