The effect of pH and sulfide ions on the corrosion behavior of 1040 carbon steel in aqueous solutions was determined by potentiodynamic polarization techniques. The investigations were conducted in a pH range of 6 to 14 and sulfide ion concentrations between 1 to 10,000 mg/l. General corrosion rates were found to be higher at lower pH at all sulfide ion levels. At low pH values, the corrosion rates increase dramatically with the increase of sulfide concentrations. In addition, with sulfide concentrations in the region of 150 to 500 mg/l the metal shows excessive tendency to pit. The pitting characteristics also exist at high sulfide levels at pH 14. Scanning electron microscopic analysis is provided for the pitted surfaces

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National Association of Corrosion Engineers
1981
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