['Regions', 'with', 'larger', '(', 'ΔΨ', ')', 'indicate', 'increased', 'surface', 'reactivity', '[', '11,15,18', ']', ',', 'and', 'even', 'a', 'correlation', 'between', 'Volta', 'potential', 'differences', 'measured', 'in', 'nominally', 'dry', 'air', 'and', 'their', 'free', 'corrosion', 'potential', '(', 'Ecorr', ')', 'pre', '-', 'determined', 'under', 'immersed', 'conditions', 'has', 'been', 'reported', '[', '18', ']', '.']