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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]
One B-25C of the 321st Bomb Group was nicknamed "Patches" because its crew chief painted all the aircraft's flak hole patches with bright yellow zinc chromate primer. By the end of the war, this aircraft had completed over 300 missions, had been belly-landed six times, and had over 400 patched holes.
Special kinds of primer (rust-converters) can be used to chemically convert rust to the solid metal salts. [7] This process is not recommended for structural steel. Painting and gluing aluminum are especially important in the aircraft industry, which uses toxic zinc chromate primers and chromating to add the necessary adhesion properties. In ...
Chromate conversion coating or alodine coating is a type of conversion coating used to passivate steel, aluminium, zinc, cadmium, copper, silver, titanium, magnesium, and tin alloys. [ 1 ] : p.1265 [ 2 ] The coating serves as a corrosion inhibitor , as a primer to improve the adherence of paints and adhesives , [ 2 ] as a decorative finish, or ...
The aircraft involved was a Boeing 737-8AS, registration ET-ANB, s/n 29935. [ 1 ] [ 6 ] It first flew on 18 January 2002, and was delivered new to Ryanair on 4 February 2002 as EI-CSW. Stored in April 2009 ( 2009-04 ) , Ethiopian Airlines took delivery of the aircraft on 12 September 2009, leased from CIT Group . [ 3 ]
A conversion coating is a chemical or electro-chemical treatment applied to manufactured parts that superficially converts the material into a thin adhering coating of an insoluble compound.