The nitrite concentration level required to preserve steel passivity on exposure to sea water saturated with Ca(OH)2 was determined by measuring the galvanic current Ig between areas freely exposed to oxygen and those in crevices of variable width, which, therefore, had a restricted supply of oxygen. The transition from an active to a passive state was found to start and end at [NO2−]/[Cl−] mole ratios of 0·1 and 1, respectively. Both corrosion current and corrosion potential measurements provided these same ratios as Ig data.
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