Fig. 6 | npj Materials Degradation

Fig. 6

From: Localized corrosion of low-carbon steel at the nanoscale

Fig. 6

The post-corrosion landscape and characterization data suggest a reinitiating galvanic mechanism represented by this schematic illustration. a Cross-section of the localized corrosion region with the cementite grain surrounded by ferrite and exposed to an aqueous solution. b Ferrite at the phase boundary corroded, and the resulting local spike in solvated iron species caused corrosion product to form. c Corrosion of ferrite progressed significantly enough to expose the cementite grain to fluid flow and to allow fluid access to the cavity, which pushed the cementite grain into grain αB. d The reconnected cementite-ferrite interface reinitiated galvanic corrosion. e Galvanic corrosion terminated due to loss of cementite mobility and/or severance of electrochemical activity, as ferrite was fully converted to corrosion product by the end of the experiment. Incident beam direction from bottom as pictured

Back to article page