Study of the interconnection of aluminum electrolyzer life with corrosion of its casing

It is confirmed that an aluminum electrolyzer casing is subject to electrochemical corrosion. It is established that on reaction of electrolyzer associated gaseous products with the electrolyzer casing there is formation of fluorides of bi- and trivalent iron, and also iron fluorides of non-stoichiometric composition. It is shown that the fluoride layer formed does not protect the casing surface from further corrosion. In order to protect the electrolyzer casing it is necessary to fasten a refractory barrier layer. More reliable heat insulation should be used in order to maintain the optimum casing heating temperature. Translated from Novye Ogneupory, No. 1, pp. 39 – 42, January 2009.