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2004
Corrosion
F 7000
44- 018
Sudden Onset of Pitting Corrosion on Stainless Steel as a Critical Phenomenon.
— Detailed, time-resolved, in situ visualizations of the onset of pitting corrosion of
stainless steel directly in the electrolyte (0.05 M NaCl) by ellipsomicroscopy for surface imaging and specially adapted high-resolution contrast-enhanced optical microscopy indicate that the sudden onset of corrosion can be explained by an explosive autocatalytic growth of metastable pits. Stabilization of individual pits takes place only
later. This finding agrees with a theoretical approach treating the onset of pitting corrosion as a cooperative critical phenomenon resulting from interactions among metastable pits, and it extends perspectives on the control and prevention of corrosion onset.
The given analysis brings investigations of localized pitting corrosion into a conceptual
framework of autocatalytic processes and nonequilibrium pattern formation phenomena in reaction-diffusion systems. — (PUNCKT, C.; BOELSCHER, M.;
ROTERMUND, H. H.; MIKHAILOV, A. S.; ORGAN, L.; BUDIANSKY, N.;
SCULLY, J. R.; HUDSON*, J. L.; Sci. (Washington, D. C., USA) 305 (2004) 5687,
1133-1136; Dep. Chem. Eng., Univ. Va., Charlottesville, VA 22903, USA; Eng.) —
W. Pewestorf
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