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The polarization curves of low carbon steel in deaerated carbonate bicarbonate buffers (pH 10.3) show three distinct regions: (a) an active region characterized by a Tafel slope of 125 ± 5 mV which is independent of the chloride concentration, (b) a gradual active to passive transition, and (c) a broad passive region. The addition of NaCl has a stronger effect on the passive than on the active region...
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