The Relationship Between Galvanic Current and Dissolution Rates

Abstract

Abstract The recent development of instrumentation suitable for accurate determination of galvanic currents suggests that more data of this nature will be gathered and reported. It is shown that galvanic current data cannot be an accurate measure of dissolution rates in many cases, since dissolution rates from the galvanic current are smaller than the true dissolution rates. Correction of galvanic current data is possible, however, and correction procedures are explained for two limiting cases. Experimental support for the relationships derived is presented for Al alloys in aerated 3.5% NaCl coupled to a variety of dissimilar metals and alloys.