A Complete Treatise On the Electro Deposition of Metals Comprising Electro Plat
A Complete Treatise On the Electro Deposition of Metals Comprising Electro Plat
Georg Langbein
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, blue vitriol 10^ ozs. , 60 per cent, caustic soda 28 ozs. The chief purpose of the large content of caustic soda is to keep the tartrate of copper, which is almost insoluble in water, in solution. According to Weil, the coppering may be execu- ted in three different ways, as follows : The iron articles tied to zinc wires or in contact with zinc strips are brought into the bath ; the coppering thus taking place by contact. Or, porous clay cells are placed in the bath containing the articles ; ...these clay cells are filled with soda lye in which zinc plates connected with the object-rods are allowed to dip, the arrangement in this case forming an element with which, by the solution of the zinc in the soda lye, a current is produced, which effects the decomposition of the copper solu- tion and the deposition. When saturated with zinc the soda lye becomes ineffective, and, according to Weil, it may be re- generated by the addition of sodium sulphide, which separates the dissolved zinc as zinc sulphide.
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