Corrosion Behavior of Mild Steel in High pH Aqueous Media

摘要

The paper reports on a study of the corrosion behavior and localized corrosion susceptibility of mild steel in a simulated ground water with a pH of 9.75 and a temperature of 95C. The steel used in the study was A27, ASTM Grade 60-30. The steel did not passivate in the aqueous environment used. The corrosion rate decreased with exposure time. Corrosion occurred in an uneven form over the surface, and although some pitting may have been present, no deep pits were observed. The amount and distribution of the areas of ferrite and pearlite as well as the impurities were determined to be important as related to uneven corrosion and to localized attack.