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Zinc chromate, Zn Cr O 4, is a chemical compound, a salt containing the chromate anion, appearing as odorless yellow powder or yellow-green crystals, but, when used for coatings, pigments are often added. [2] [3] [4] It is used industrially in chromate conversion coatings, having been developed by the Ford Motor Company in the 1920s. [5]
The Cronak process is a conventional chromate conversion coating process developed in 1933 by The New Jersey Zinc Company. [1] It involves immersing a zinc or zinc-plated article for 5 to 15 seconds in a chromate solution, typically prepared from sodium dichromate and sulfuric acid. [2]
The chromate coating acts as paint does, protecting the zinc from white corrosion, thus making the part considerably more durable, depending on the chromate layer's thickness. [8] [9] [10] The protective effect of chromate coatings on zinc is indicated by color, progressing from clear/blue to yellow, gold, olive drab and black.
In 1932, Lewis T. Briggs Sr., a part-owner of the Erie Bronze Company, bought out Smith's co-investors and became president of the eight-person company. During World War II the Erie Plating Company expanded into plating military components. The main wartime products produced in Erie were bomb fuses, aircraft parts, and communication equipment.
Chrome Plating. Kuntz Electroplating Incorporated is a family owned surface finishing company specializing in Chrome plating.It is North America's largest polishing and plating company for original equipment manufacturers of steel, aluminum and zinc components for the automotive, motorcycle, appliance and specialty equipment industries.
Such zinc electroplating or zinc alloy electroplating maintains a dominant position among other electroplating process options, based upon electroplated tonnage per annum. According to the International Zinc Association, more than 5 million tons are used yearly for both hot-dip galvanization and electroplating. [ 1 ]
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