Abstract




 
   

Vol. 11, No. 4 (November 1998) 213-218   

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  EVIDENCE OF THE POTENTIAL SHIFT MECHANISM IN CREVICE CORROSION (RESEARCH NOTES)
 
 
C. Dehghanian
 
Department of Chemical Engineering
Isfehan University of Technology
Isfehan, Iran
 
 
 
 
 

Abstract    Previous research has indicated a qualitative resemblance between the current distribution along actively corroding crevice walls and currents measured in corresponding anodic polarization plots. Using detailed measurements of the potential gradient along the crevice, a semi-quantitative current distribution was calculated for the crevice wall using a double numerical differentiation method. The calculated current distribution was found to approximate that of the active loop measured in independent anodic polarization tests of the free metal surface.

 

Keywords    Crevice, Potential, Corrosion, Current Distribution, Double Numerical Differentiation, Polarization

 

References   

1. Valdes, A. and Pickering, H. W., "IRD Drops and the Local Electrode Potential During Crevicing of Iron," Advances in Localized Corrosion, H. S. Isaacs, U. Bertocci, J. Kruger, NACEE-9, NACe, Houston, Texas, (1990), 393-401.
2. Pickering, H. W., "Significance of the Local Electrode Potential within Pits, Crevices and Cracks", Corrosion Science, 29, (1989), 325-341.
3. Pickering, H. W., "A Critical Review of IR Drops and Electrode Potentials within pits, crevices and cracks", Advances in Localized Corrosion, NACE-9, NACE eds., (1994), 77-84.
4. Xu, Y. and Pickering, H. W., "Model of the Potential and Current Distributions within Crevices and its Applications to the Iron-Ammoniacal Solution"; Proc. Sym. On Critical Factors in Localized Corrosion, Electrochemical Soc., Pennington, NJ, Vol. 91-2, (1991).
5. Sagues, A. A. and Zayed, A. M., Corrosion, Vol. 47, (1991), 852.
6. Dahlquist, G. and Bjorck, A., "Numerical Methods," Prentice-Hall, Inc., Englwood Cliffs, NJ, (1974), 269.






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