Coulometric technique of thickness measurement is based on Faraday's first law of electrolysis. This method involves the measurement of quantity of electricity required to dissolve the coating anodically from a known area of the sample. Several factors affect the accuracy of the method. This paper describes the design and development of a PC based Coulometric thickness gauge. A software package has been developed to run the experiments automatically. The results obtained using the developed instrument have been presented.
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