Abstract
From the standpoint of power consumption the results of this investigation indicate that chromium plating baths should have a concentration of 4.5 molar CrO3 at 45° C. and 3.75 molar at 25° C. It is shown that for all practical purposes the increase of conductivity of chromic acid solutions is a linear function of the temperature, over the range of temperatures covered in plating work. It is shown that the addition of the sulfate ion has the effect of increasing the conductivity of the solution to a maximum when the sulfate ratio is approximately 50, which coincides with the sulfate ratio giving optimum cathode efficiency. Calculations of pH from conductivity data are in fair agreement with the values obtained by other investigators employing potential methods. The hydrogen and quinhydrone electrodes are definitely shown to give erroneous pH values in chromic acid solutions. Furthermore, the platinized‐platinum oxygen electrode is shown to be inaccurate in chromic acid solutions.
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