Products Finishing

OCT 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 92 of 115

PLATING 1. Hot soak for 5 min. 2. Rinse 3. 15-percent hydrochloric acid for 10 min. 4. Rinse three times 5. Zinc chloride plate for 20 min. 6. Trivalent chromium conversion coating for 30 sec. 7. Rinse twice 8. Blow dry. We do not electroclean the parts. Do you have any suggestions for solving this problem? —W.J. A. Thank you for supplying reasonable details on your plating process. Assuming the process steps for both are the same, I would investigate whether the same base material is used to manufacture both the small fittings and the large fittings. I would also investigate your cleaning steps for the large fittings. The base materials may be undercleaned and, surprisingly, you may have overclean parts. Overcleaning can open pores that, in turn, can give rise to the delayed corrosion that you see. Try cleaning the large pieces for a shorter period of time. If this seems to reduce the amount of delayed corrosion that you see, you are on the right track. Another step that you should investigate is applying a somewhat thicker layer of zinc to the parts. It might be helpful to determine the thickness of the zinc on the barrelplated parts versus that on the rack-plated parts. CLINIC Increase Your Profts! Reduce Small Part Racking Labor by 70% Proven! • Prolongs Rack Life • No Electrical Hookup • Improves Productivity • Heavy Duty Construction • Dual Switch Activation • 70 psi Air Supply Required • Eliminates Carpal Tunnel Syndrome • Rack and Unrack on the Same Machine • Handles Single, Two and Four Sided Racks Painting, Anodizing, Plating and Vacuum Coating Small Part Racks From Endura ● No Minimum - one rack or 1,000 ● High Density of Parts Held Securely ● Racks Custom Designed to Hold Your Parts ● Affordable Endura Corporation 510 Church Street Nokomis, Florida 34275 Phone: 941- 485-7235 Fax: 941- 485-6311 Your Finishing Equipment Source Design, Fabrication and Installation • Automated & Manual Finishing Lines • Exhaust Systems • Metal & Thermoplastic Tanks, Sinks & Liners • Wastewater Evaporators • Plating Racks & Baskets 877.615.6460 (toll free) • New Equipment or Rebuilds PRODUCTS FINISHING — 91

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