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Intergranular corrosion (IGC) is observed on mild steel surface when the steel is polarized to passive potential zone in CO2+NaNO2 solution. The methods of potentiodynamic polarization, scanning electron microscope (SEM) and scanning tunneling microscope (STM) are applied to study the phenomenon. Intergranular corrosion mainly happens as the steel is polarized into the active–passive transition zone,...
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