Corrosion Removal

Written by Jeremy Horelick
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Corrosion removal is a critical but oft-overlooked step in the powder coating process. Before any type of long-lasting finish may be applied, the part must be thoroughly cleaned. This achieves multiple goals at once such as laying the foundation for a smooth coat as well as aiding in adhesion.

A seasoned powder coater understands that the corrosion removal process varies from part to part. It's not enough simply to clean the item with detergent and water, as this fails to remove built-up grease and heavy oxides. In fact, some parts require power-blasting to take out rust, bumps, and other sorts of imperfections.

Corrosion Removal for Different Metals

The part itself best determines the appropriate corrosion removal process, as each item has its own unique composition. Remember, not only are there "pure" metals such as 100-percent iron or zinc, but alloys (or metal combinations) as well. The savvy customer will be sure to alert his or her powder coating plant about the chemical composition of parts prior to turning them over for treatment.

At the same time, there are general techniques and procedures that guide corrosion removal for various metals. Most incorporate some combination of cleaning, rinsing, drying, etching, grain refining, and acidulated rinsing. Some metals such as steel and aluminum require rinsing stages between each step along the way, while others require but one rinse to wash away particles and resins.

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