Electrodeposition of Nickel
The Journal of Physical Chemistry
A number of years ago, Calhane and Gammagel published some very interesting facts concerning the deposition of nickel from solutions of nickel ammonium sulphate. Although these experiments were made to study the impurities, such as iron, deposited with the nickel, they bring out some facts which may serve to throw light on the theory of nickel deposition. In their work, the anodes used were the commercial ones, containing about 7.5 percent iron, and about 92 percent nickel. The fir& experiment
... onsisted in the electrolysis of the nickel solution (containing about 80 grams of nickel ammonium sulphate per liter of water) using the nickel-iron anodes 'and platinum sheet cathodes. The current density was about 4 amperes per square decimeter, and the current efficiency on a one-hour run, was about 88 percent, the deposit containing about 0.15 percent iron. The effect of stirring was then tried by running two cells in series, one having a stirrer which rotated 130 revolutions per minute, while the other had a stationary electrolyte. The efficiency in the two cells was practically the same, being about 90 percent. The iron in the deposit from the still solution was 0.13 percent, and that from the stirred solution was 0.36 percent. The effect of rotating the cathode was then tried by running two cells in series, the conditions being the same with the exception that one held a stationary cathode while the other had the cathode rotated 130 revolutions per minute. The efficiency of deposition was 91 percent with the stationary and 12 percent with the rotating electrode. The iron contained in the deposit was 0 . I I percent for the stationary, and 0.55 percent for the rotating cathode. Cathodes were used rotating 260, 519, 1041, and 2160 revolutions per minute, and Jour. Am. Chem. SOC., 29, 1268 (190:).