MANUFACTURE OF SILVER-SILVER CHLORIDE ELECTRODE HAVING SILVER CHLORIDE LAYER ON SURFACE OF SILVER SUBSTRATE

摘要

PROBLEM TO BE SOLVED: To manufacture a high-precision silver.silver chloride electrode by electrolytically oxidizing a silver substrate worked mechanically and polished chemically, in a solution containing chloride ions, and chloridizing the surface layer part of the silver substrate. ;SOLUTION: A silver substrate obtained by cutting a silver round bar of a diameter 10mm and a purity 99.9% into a length of 40mm for example, and degreasing, wet-polishing, and washing it, connecting a lead wire to its one side after that, and covering the periphery of the lead wire connected part with a thermally shrinking tube with an adhesive leaving a specified test surface as it is, and a silver plate as an electrode are prepared. This silver substrate with a lead wire is polished chemically by dissolving its surface, by dipping it in a mixed solution, in a agitated state, composed of 10% of saturated chromium oxide (valence VI) solution, 5% of hydrochloric acid, and the remaining of distilled water for about a minute. The silver substrate with a lead wire obtained by polishing and the silver plate are dipped in a 0.75N hydrochloric acid solution, and a current is caused to flow by a current density of 1.0mA/cm² for about one hour with the silver substrate with a lead wire as an anode and with the silver plate as a cathode. Consequently, it becomes possible to manufacture silver-silver chloride electrodes having silver chloride layers on the surfaces of silver substrates with lead wires.;COPYRIGHT: (C)1998,JPO