Straining electrode experiments have shown that Fe3O4 grown on iron in NaOH electrolyte at 85 C fractures at strains ranging from less than about 3 × 10-4 to 3 × 10-3. Films less than 100 Å thick fracture at the smaller strain, whereas 1 μm films fracture at the larger value. Fracture strain is potential dependent, being least in the active-passive potential region of polarization behavior and increasing as the film growth potential becomes more anodic. These observations were used to interpret the potential dependence of caustic stress corrosion cracking (SCC) according to a film rupture model.

Subject
Films, Thin films, Anode potential, Oxides, Borate, Oxide films, Fractures, Film formation, Risk reduction, Electrodes, Electrolytes, Ductility, Electrode potential
© 1976 National Association of Corrosion Engineers
1976
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