Abstract
Measurements of the potential gradients along real, and simulated cracks have been made for an HY80 steel in natural seawater and on simulated cracks for a C-Mn steel in a CO2-3/HCO-3 solution. The simulated crack cell also allowed measurement of the current flow in the crack enclave. The results show that large potential drops only occur along cracks if attempts are made to pass relatively large currents along the crack enclave, so that if the applied potential is not too far removed from the free corrosion potential or the environment is one that promotes passivation of the steel surface then any initial potential drop will decay relatively quickly.
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