Electrochemical studies of corrosion reaction are usually carried out with three or two electrode systems, which employ Pt as counter electrodes. Although it is good practice to keep the test electrode, counter electrode, and reference electrode in separate compartments in order to avoid contamination of the test electrolyte and test electrode surface by reaction products from the counter electrode and/or electrolyte from the reference electrode, all three electrodes or at least the test and counter electrode are often placed in the same electrolyte compartment, since such an arrangement sometimes seems more convenient. This note reports some observations which seem to indicate that under certain conditions, erroneous results can be obtained due to reaction of the test electrode with dissolution products of the Pt counter electrode.
During a study of inhibition of corrosion of Ti alloys,1 some experiments were carried out to study the effect of nickel ions on corrosion...
