Corrosion Resistance of Finer/Coarser Pearlitic Structures of Carbon Steel

Corrosion performance on pearlite structures of carbon steels has been researched using scanning Kevin probe force microscopy and energy-dispersive X-ray spectroscopy. The corrosion test was conducted by immersing in borate buffer solution containing NaCl. In the coarser structure, we detected an increase Volta potential at pearlitic cementite–ferrite boundaries after corrosion, accordance with following: increasing C concentration, decreasing Mn concentration. We little change inorganic element concentrations finer structures. Crack-like trenches, a depth less than several nanometers, formed along where increased demonstrated importance concentration elements (such as C) promoting initiation higher susceptibility for