Application of P. R. Process to the electroplating of some metals has recently been reported occasionally. This paper deals with the investigations on the iron layers electrodeposited by P. R Process applied over the conventional method.
By means of macroscopic and microscopic observasions, current efficiency measurement, and hardness test, as well as observations of annealed structures, the following conclusions are arrived at:
1) The surface of the electrodeposited tends to be smooth.
2) The fibrous structure in the layers electrodeposited by the conventional method tends to be columnar or mesliy.
3) The longer the reversed current, which is anodically and periodically applied on the cathode, is sued, the more remarkable are the tendencies descrived above.
4) The effects on the current efficiency and on the hardness of deposits are not apparently noticeable. Thus the application of P. R. Process seems to be favorable to the electrotyping of iron.
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