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The company was a family owned business that operated since the late 1930s until 2009. [5] [6] In December 1983, a partially below-ground storage tank holding approximately 3,640 gallons of chromic acid plating solution containing approximately 5,400 pounds of chromium failed, leaking the solution directly into the groundwater underneath. [7] [1]
The anodizing current varies with the area of aluminium being anodized and typically ranges from 30 to 300 A/m 2. Aluminium anodizing (eloxal or Electrolytic Oxidation of Aluminium) [12] is usually performed in an acidic solution, typically sulphuric acid or chromic acid, which slowly dissolves the aluminium oxide.
This kind of chromic acid may be used as a cleaning mixture for glass. Chromic acid may also refer to the molecular species, H 2 CrO 4 of which the trioxide is the anhydride. Chromic acid features chromium in an oxidation state of +6 (and a valence of VI or 6). It is a strong and corrosive oxidizing agent and a moderate carcinogen.
For aluminum, the chromate conversion bath can be simply a solution of chromic acid. The process is rapid (1–5 min), requires a single ambient temperature process tank and associated rinse, and is relatively trouble free. [2] As of 1995, Henkel's Alodine 1200s commercial formula for aluminum consisted of 50-60% chromic anhydride CrO
Hexavalent chromium plating, also known as hex-chrome, Cr 6+, and chrome(VI) plating, uses chromium trioxide (CrO 3, also known as chromic anhydride) as the main ingredient. Hexavalent chromium plating solution is used for both decorative and hard plating, as well as bright dipping of copper alloys, chromic acid anodizing , and chromate ...
Oldcastle Materials Inc. is a supplier of asphalt, concrete, and other building materials, and also offers construction and paving services. The Atlanta-based company is a subsidiary of CRH plc, a publicly traded international group of diversified building materials businesses, [2] [3] and has approximately 18,000 employees at 1,200 locations, as of March 2018.
Floor area 140,000 sq ft (13,000 m 2 ) The Michner Plating Co.–Mechanic Street Site, as dubbed by the EPA , [ 1 ] is a 140,000 square foot industrial complex that sits upstream to the Grand River in Jackson , Michigan. on the corner of N. Mechanic Street and W. Trail Street.
[2] [3] Processes for producing anodic aluminum oxide membranes using chromic acid, sulfuric acid, oxalic acid, or phosphoric acid appear in a patent attributed to Alan W. Smith of the Boeing Company in 1974. [4] The formation of AAO with highly ordered 2D hexagonal porous structure was first demonstrated in 1995. [5]