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To fully understand the benefits of electrocoating, it is necessary to
understand the mechanics of the process. We use gray oxide primer carefully
balanced with resins, pigments and corrosion inhibiting agents. As
processed, resins are water insoluble and must be converted chemically
into salts that are easily dispersed into the water.
In electrocoating, our tanks are filled with this water dispersion of paint. The paint particles have a negative surface charge due to the salt formation. The structural members to be painted are connected to the positive side of a powerful DC power supply, giving them a positive charge. The tank itself is wired to the negative side of the power source. When the power supply is activated, the current flows from the negatively charged tank to the positively charged structural steel, causing the negatively charged paint particles to migrate to the steel and be plated to the surface. During this plating process, taking one to two minutes, electro-chemical reactions take place on the surface of the structural parts, changing the salts in the paint back to their original acid state. The voltages involved (200-300 VDC) act as a kind of electronic pressure to densify the resin, resulting in a paint film not only water insoluble, but virtually 100% solid. After coating, the parts are baked in an oven, converting the paint films to an enamel composition that is hard, abrasive resistant and it's with this process, superior corrosion resistance is achieved.
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