Products Finishing

NOV 2013

Products Finishing magazine is the No. 1 industrial finishing publication in the world. We keep our readers informed about the latest news and trends in plating, painting, powder coating, anodizing, electrocoating, parts cleaning, and pretreatment.

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Page 44 of 59

POWDER COATING recommend and why? What conversion coating (Zn phosphate, iron phosphate or zirconium) would you recommend and why? —A.B. A. There are two significant problems with this process that could make it impractical: 1. The zinc-nickel electroplated coating is an alloy that could make adhesion difficult, especially if it is postformed. Even if the part is formed first, there is a risk of corrosive attack at the cracks in the electroplated coating. 2. The chromate passivator used as a final rinse during the electroplating process could interfere with adhesion. That step would need to be eliminated from the electroplating process if you are going to try coating over the plating. I would eliminate the plating process if at all possible. It has corrosion-resistant properties, but it is not a good surface for powder coating. I would consider the following process: 1. Alkaline cleaner 2. Water rinse 3. Water rinse 4. Zirconium oxide treatment 5. Pure water rinse. This will give you a clean part and good corrosion resistance. The powder will bond to the treated surface, and if you use a post-formable powder, it will take the bend. CLINIC For over 60 years, we have provided Electrical Safety Equipment for Industry. For complete info, contact us at Visit our website at ElcomEtEr 550 POWDER THICKNESS GaUGE Accurately predicts cured thickness of a coatng before cure - without disturbing coatng powders Whether measuring pre-cure thickness, oven temperature profling, dry flm thickness, gloss or other physical test parameters, Elcometer's range of high quality powder coating inspection products are available at competitive pricing. Powder Thickness Oven Data Logging Dry Film Thickness Physical Test The Elcometer 550 ultrasonic thickness gauge accurately predicts cured thickness of powder on metal, plastic, wood and MDF to a resolution of 1 micron. The Elcometer 215 is an easy to use oven data recorder, used to measure and store the temperature profles of both the sample and the oven during the cure process. 40% faster than other coating thickness gauges, the Elcometer 456 provides faster, more accurate and repeatable readings. Elcometer offer a wide range of test equipment to assess parameters including: abrasion, hardness, elasticity, elongation, deformation and gloss. USA & Canada: (800) 521-0635 PRODUCTS FINISHING — 43

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