Brass World and Platers' Guide, Vol. 10: A Journal Devoted to the Art of Refining, Alloying, Casting, Rolling, Founding, Electroplating of All the Non-Ferrous Metals (Classic Reprint) - Hardcover

Inhaltsangabe

Excerpt from Brass World and Platers' Guide, Vol. 10: A Journal Devoted to the Art of Refining, Alloying, Casting, Rolling, Founding, Electroplating of All the Non-Ferrous Metals

The old method of making the single nickel salts, which were afterwards made into the double salts, by the addition of sulphate of ammonia, was by dissolving metallic nickel in nitric acid and then evaporating with sul phuric acid, to drive off the nitric acid. This is an unsatisfactory method for the reason that several evap-ora-tions are required in order to free the salts completely from the nitric acid. Even a slight trace of nitric acid in the plating solution will greatly affect the deposit, and Dr. Isaac Adams laid great stress, in his original patent, on the necessity of hav~ ing the nickel salts free from this acid. It has been said that his patent was unique for the reason that it was granted upon some thing that ought not'to be done (keeping the nitric acid out of it). He regarded this the essential feature of the patent and it was stated that the presence of nitric acid in the solution was the reason for the failure of previous attempts at nickel plating.

The double and nickel salts are known by several names. The double salts are known by the following designations.

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