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Searching for a clear zinc spec



2003

I'm searching for a commercial spec. for clear zinc on steel bars and formed sheetmetal parts that would include thickness and cosmetic appearance.

John Kull
a network equipment supplier - Milpitas, California, USA



2003

Perhaps you want an electroplated zinc coating with a colorless chromate finish. See ASTM B633 [affil. link] -98e1 Standard Specification for Electrodeposited Coatings of Zinc on Iron and Steel, available from www.astm.org. There are 4 zinc coating thicknesses as well as supplemental finishes (Type III is colorless chromate) from which to select. Re other cosmetic factors: "Defects in the surface of the basis metal, such as scratches, porosity, pits, inclusions" are not the responsibility of the plater (unless also the fabricator). Luster (bright, semi-bright or dull) should be agreed upon in advance and specified in the purchase order. Workmanship requirements specify uniformity of coating, etc.

Ken Vlach [deceased]
- Goleta, California

contributor of the year Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.



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