Metal Record and Electroplater Volume 2, No. 12

Metal Record and Electroplater Volume 2, No. 12

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ... deposition of that metal alone. It was stated also that for a given current density this depends partly upon the relation between the single potential of the desired metal and the single potential of hydrogen, or of some other metal in the solution. If hydrogen or some metallic impurity is below the desired metal in single potential, then the hydrogen or metallic impurity will be deposited along with the desired metal, and will cut down the current efficiency with respect to the desired metal. If the secondary clement deposited is hydrogen, the actual metallic deposit resulting will be practically pure metal, and may be pitted or burned, or may be of good quality, according to conditions. If the secondary clement deposited is a metal, then the metallic deposit will in most cases be an alloy of the two metals. In some cases it may be simply a spongy mass, consisting of a mechanical mixture of separate particles of each of the two metals. Where the deposit is smooth and coherent, however, it is generally found that it consists of a true alloy of the two metals. From this it-will be seen that the factors affecting the current efficiency of a solution are very much the same as those affecting the deposition of alloys, except that in- the case of current efficiency we attempt to so modify these factors as to produce a single pure product free from secondary products, while in the case of alloys we make use of these same factors to produce an impure deposit containing a certain desired proportion of the secondary product. In the previous article, page 314, November, 1916, under the heading "Single Potentials of the Metals," it was shown that the voltage of decomposition of a salt must be exceeded before that salt will decompose and...
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Product details

  • Paperback | 38 pages
  • 189 x 246 x 2mm | 86g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236649923
  • 9781236649928