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Additional info for B0684 Corrosion-deformation interactions (EFC 21) (matsci)
Corros. , 1995, 37 (2),231-239. 10. Kofstad, High Temperature Corrosion. Elsevier Applied Science, London and New York, 1988. 11. A. Forty, Physical Metallurgy of Stress Corrosion Fracture, T. N. Rhodin, Ed. Interscience Publishers, New York, 1959, pp. 111-113. 12. D. D. Macdonald, The point defect model for the passive state, J. Electrochem. , 1992, 139 (12), 3434-3449. 13. R. E. Smallman, Modern Physical Metallurgy, 3rd Edn. Butterworths, London, 1970. 14. H. W. Pickering, Characteristic features of alloy polarization curves, Corros.
10,271-276. 19. H. W. Pickering and C. Wagner, Electrolytic dissolution of binary alloys containing a noble metal, J. Electrochem. , 1967,114 (7), 698-706. 5 Mechanistic Studies of the SCC Behaviour of Oriented Cu30Zn Single Crystals in NaNO, Solutions J. C. ELKENBRACHT, B. D. LIGHTER*, C. J. VAN DER WEKKEN, W. F. FLANAGAN+and J. H. W. DE WIT Laboratory for Materials Science and Technology, Delft University of Technology, Rotterdamseweg 137, 2628 AL Delft, The Netherlands tDepartment of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235, USA ABSTRACT The stress-corrosion cracking behaviour of oriented Cu3OZn single crystals in NaNO, solutions has been investigated and compared with existing data on the SCC behaviour of Cu25Au single crystals in NaCl solutions in a similar experimental set-up.
However, already at lower potentials corresponding to the stability of a Cu,O oxide film, selective dissolution of zinc took place at local areas on the sample surface leaving a mixed zinc oxide/cuprous oxide layer on the surface under which a zinc depleted layer was visible. This was also visible as a slight increase in zinc concentration in the water at lower potentials. The initiation of TGSCC cracks took place at these zinc depleted areas covered by both ZnO and Cu,O. Due to the diffusion potential and ohmic drop the potential of the sample surface beneath this dealloyed layer is lower than the electrode potential of the free sample surface.