Abstract
Experiments were performed in aerated 0.5 M NaCl solution over a range of selected Re numbers, using electrode couples of painted steel to bare steel at varying surface ratios. Results showed that, provided the painted to bare steel ratio was high flow, effects were not harmful. The bare steel was protected by a thin grey film of protective zinc hydroxide. Areas containing iron corrosion products were afforded temporary protection by a non-protective type of bulky white corrosion product, providing the steel was being subjected to cathodic protection. Once this was lost rusting of the underlying steel restarted at these points with iron corrosion products breaking through this overlying non-protective film.
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