Electroplating a Treatise On the Electro Deposition of Metals
Electroplating a Treatise On the Electro Deposition of Metals
William R Barclay
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Gr. 1'45), on the other hand, does not dissolve this metal. Iron forms three oxides, Ferrous oxide, FeO, Ferric oxide, Fe. /) 3, Ferroso-ferric oxide, Fe 3 4 . Two series of salts are formed, corresponding to the two first-named oxides. Of these the ferrous compounds are the best known and are the only ones of general use to the electroplater, though some operators, including Watt, have THE DEPOSITION OF IRON 299 claimed that they have obtained good results from some ferric compounds. Iron Solu...tions and Conditions of Deposition. One of the earliest solutions used for iron deposition is that recommended by Varrentrapp, "" consisting of a solution of ferrous sulphate in water of a strength of about 1 Ib. Per gallon, to which is added a nearly equal quantity of ammonium chloride. This latter substance may be omitted, however, without materially affecting the deposit. The principal difficulty with this solution, as with similar ones, is that on exposure to the air the ferrous salt becomes oxidized and an insoluble basic salt is formed which separates out as a green powder and ultimately interferes considerably with the action of the bath.
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