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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.
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]
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
This list is based on the Forbes Global 2000, which ranks the world's 2,000 largest publicly traded companies. The Forbes list takes into account a multitude of factors, including the revenue, net profit, total assets and market value of each company; each factor is given a weighted rank in terms of importance when considering the overall ...
In July, Erie Plating Company filed a petition for reassessment, a hearing was held in January of the following year, and three months later the Bureau reaffirmed its assessments. Erie Plating Company again appealed for reassessment, and the issue came to a head on December 17, 1958, during the second hearing on the issue.
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.
Galvanization (also spelled galvanisation) [1] is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are coated by submerging them in a bath of hot, molten zinc. [citation needed]