A Rapid Electrochemical Technique for Determining the Current Efficiency for Cadmium Plating.
Technical rept. Jun-Dec 86,
NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DIRECTORATE
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A rapid electrochemical technique has been developed to determine the current efficiency for cadmium plating from dull and bright cadmium-cyanide plating baths. Cyclic voltammetry experiments are described which were performed to develop the proposed method. The technique was validated by comparing the results obtained with weight loss and gain measurements to those measured electrochemically. Current efficiency for cadmium plating performed over a range of applied current densities and total hydrogen analysis tests were performed to show the usefulness of the technique. A rapid electrochemical technique has been described for determining the current efficiency for Cd plating using standard Cd-cyanide baths. Current efficiency measurements have been made over a range of applied current densities and have been statistically compared with weight gain and loss measurements. Total hydrogen analysis tests have been used in conjunction with this technique to correlate current efficiency for Cd plating with hydrogen uptake. It was shown that a 2 decrease in current efficiency fo CD plating increased hydrogen uptake by approximately 50. This method can be used as a sensor to monitor the effects of impurities, bath composition or part geometry on the current efficiency for Cd plating. In addition, it can be used as a research tool to quickly and accurately measure the effects of various plating parameters or bath additions on the current efficiency for Cd plating. Keywords Cadmium plating, Hydrogen current efficiency, Steel alloys.
- Inorganic Chemistry
- Fabrication Metallurgy