The variation of the relationship between polarisation and current density at a rotating copper cathode in an electrolyte of copper sulphate and sulphuric acid has been observed under conditions and concentrations similar to those employed in the plating industry, and during the formation of thick deposits. The effect of the following parameters was studied: time of electrolysis, agitation, temperature and composition of electrolyte, and the consequent effects upon the structure of the resulting deposits were noted.
The possible effects of the co‐deposition of hydrogen at the cathode is discussed in relation to the structure of the copper at high current density.
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