An Electrical Resistance Method for Measuring Rates of Corrosion of Electrodeposited Metals in Laboratory Tests

SummaryThe rates of corrosion of detached foils of electrodeposited nickel, copper, zinc and cadmium in sulphur dioxide and salt spray tests have been obtained by measurements of changes in the electrical resistance of the test-pieces. The method has been found to be of practical value and is very sensitive but it has the disadvantage that at its present state of development it can only be applied to detached coatings and any effects associated with a basis metal are therefore not revealed. The results obtained have been consistent with those previously found in other ways for the coatings and corrosive environments studied. Dull and semi-bright nickel were corroded slower than bright high-sulphur nickel and cadmium behaved better than zinc.