The Electro Deposition of Brass From Cyanide Solutions
The Electro Deposition of Brass From Cyanide Solutions
Earl Grover Sturdevant
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The increase in potential of both copper and zinc (Curves 1 and 2, Plates VI and VII) shows that the metal ion concentra- 28 EARL GROWER STURDEVANT. tions decrease with increase, in the alkalinity of the solution. This decrease in metal ion concentration produces an increase in cathode polarization (Curve 3, Plates VI and VII) and thus a decrease in the percentage of copper in the deposit (Curve 4, TABLE XIII. Ammonium Hydroxide. Efficiencies Potential Measurements i Per- Eauiva- Row Anodes cen...t of Copper Cath. In De ' lent of NH 4 OH per With Current Without Current Character of Deposit Anodes Anodes posit Copper Zinc [ Copper Zinc Copper Zinc 1 103. 8 95. 5 ! 99. 3 63. 9 0. 0 0. 830 . 975 1. 425 0. 907 1. 090 1. 005 Dull red 0. 846 . 972 1. 435 0. 935 1. 028 0. 842 . 992 2 103. 5 93. 4 98. 4 58. 0 0. 15 0. 918 1. 019 1. 460 0. 968 1. 127 1. 021 Bright yellow 0. 919 1. 011 1. 475 1-005 1. 109 0. 916 1. 007 3 103. 3 95. 4 99. 6 55. 3 0. 30 0. 894 1. 045 1. 468 0. 970 1. 097 0. 986 0. 910 1.
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