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Powder Coating Powder Coating Process

Part Preparation

Posted By rickd2015

Whether in the kitchen or in the garage, the key to doing a good job is in the preparation. In the case of powder coating, a clean, etched surface is the ideal way to ensure an even coating. But before we clean and etch the parts we ask that you bring them to us ready to prep. Here are some tips:

  • Disassemble the parts you want coated separately. Assembled parts will be coated as a unit and may not be removable without damaging the coating.
  • Remove all non-metal parts such as:ornaments, plastic adornments. bushings, electrical wiring, feet, pads or webbing.
  • Clean off excess oils or fluids, grease and road grime.

Pot metal and cast parts require additional prep called, “outgassing.” When heated, these metals release gasses that can become trapped in the powder coating as it cures. By pre-heating these items before coating, we hope to reduce or eliminate this, but cannot guarantee a bubble-free finish.

Prep.Wheels just sandblasted Prep.Masked Wheel

To learn more about our powder coating services, including our large batch oven that is ideal for manufacturers and metal fabricators, contact us and we will be happy to show you the difference that Electro Tech’s superior service makes.

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Powder Coating FAQ Powder Coating Process

What Is Powder Coating

Posted By admin

Powder Coating Process

Electrostatic powder coating process is a method of applying electricallycharged powder coating materials to grounded parts. Powder is held to the part by this electrostatic attraction until heat is added to flow the powder together and cure it.

Powder Coating Process

Powder may adhere to the workpiece for several hours. If the uncured powder coat is damaged or blemished during handling, powder can simply be blown off with air or vacuumed and a new coat applied.

Four basic pieces of equipment commonly comprise an electrostatic powder spray coating system. They are the powder feeder, power unit, electrostatic gun, and powder booth recovery system.

Powder CoatingPowder is supplied to the spray gun from a feeder unit where the powder is diffused by compressed air into a fluid-like state. The fluidized powder is then siphon out by movement of high velocity air flowing through a venturi. It is propelled through the powder feed tubing to the spray gun.

The powder feeder provides a controlled flow of powder to the guns. Independent control of powder and air volume allows adjustable dilution ratios so a desired thickness coverage can be attained on a variety of product shapes. The powder feeder is capable of providing sufficient discharge pressure and velocity to feed the electrostatic gun 10 to 25 feet away.

Powder Coating

Powder leaves the spray gun in a form of a diffused cloud being propelled toward the work-piece. A high voltage, low amperage power unit supplies a charging electrode at the front of the spray gun. The charging electrode emits a field charge which is imparted to the powder particles. This causes them to seek out and attach themselves to the grounded work-piece.

The powder unit, or electrostatic voltage generator, has sufficient voltage to assure maximum wraparound. Voltage is variable up to 90 kV so that is may be; (1) reduced to combat Faraday “cages” encountered in spraying inside corners; (2) increased as necessary to provide wraparound, surface coverage, and efficient deposition of powder on convex surfaces and flat panels; and (3) adjusted for the powder being sprayed.

This information provided by Nordson Corporation

Trust all of your custom powder coating requirements to Electro Tech Coatings in the San Diego metro area. Call us today at (760) 746-0292.

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