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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.
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]
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]
Delivery services Manila: 1988 Cargo airline, part of 2GO Group: P A 2GO Group: Industrials Delivery services Manila: 1949 Transportation holding company P A Aboitiz Equity Ventures: Conglomerates - Cebu: 1989 Consumer goods, utilities, financials, industrials P A ABS-CBN Corporation: Conglomerate Media and entertainment Quezon City: 1946
Because electrolytically zinc-plated surfaces provide comparatively little corrosion protection, and in the case of galvanic zinc coatings on high-strength steel (e.g. category 10.9 and 12.9 high-strength bolts) there is a risk of hydrogen embrittlement, the industry needed a better corrosion protection system.
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.
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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 ]