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PRODUCTS FINISHING — pfonline.com 49 POWDER COATING C L I N I C protection. Any suggestions on how to get better outdoor performance would be appreciated. A. The options for corrosion protection can take many forms. The important thing is to remember that coating a part is an engineered process and all of the parts of the process add up to the final performance. Pretreatment with iron phosphate will remove oils and similar contamination so the bond is good but the iron phosphate will not do much to protect the steel if the coating breaks down. If you were using zinc phosphate or chrome you would get some protection and that would put less pressure on the coating layer. With iron phosphate there is a lot of pressure on the coating layer. You will need to add a primer, prefer- ably a zinc rich primer. The zinc rich primer will provide another barrier to protect against moisture penetration. The zinc content is a reactive, sacrificial barrier. The topcoat adds additional protection from moisture and ultraviolet rays. The combination makes up for the limited protection of the iron phosphate pretreatment. The zinc primer will work best over a blasted surface. The rough surface helps to set up the proper anodic electrochemical relationship between the steel and the zinc content in the primer. So your process should be as follows: blast the surface with a medium-grit aluminum oxide or garnet (not steel and not spherical shot), and run the parts through your 5-stage process if they will fit. If they do not fit you can blow off the dust and grit with clean, dry compressed air. Apply a generous layer of zinc rich primer and partially cure the primer layer; apply the topcoat and fully cure the part. This should provide the results you need. Tiny Particles – Clean Answers Your precision cleaning processes face big challenges. Call MicroCare, the world's cleaning experts. We'll show you the future of critical cleaning – removing particles even down to angstroms in size. We feature the Chemours™ Vertrel® family of nonfammable precision cleaning fuids, so we understand the chemistries, the processes and the results you need. Call an Expert Today! (800) 638-0125 Discover Per fectly Clean "MicroCare" and the MicroCare logo are registered trademarks of MicroCare Corp. "DuPont" and "Vertrel" are trademarks or registered trademarks of Dupont. "Chemours" is a trademark of Chemours. Coating Thickness Material Analysis Microhardness Material Testing • Inspection and process control of multi-layer, compositional platings or coatings on large, irregularly shaped parts • Lightweight and mobile for quick, accurate, non-destructive testing COATING THICKNESS MEASUREMENT AND COMPOSITION ANALYSIS FISCHERSCOPE ® X-RAY XAN ® 500 860-683-0781 www.fscher-technology.com info@fscher-technology.com GROUNDBREAKING TECHNOLOGY