INVERSE ANALYSIS OF GALVANIC CORROSION USING FUZZY A PRIORI INFORMATION

A new method for estimating the galvanic corrosion rate is developed. In the case where the electrochemical polarization curves of metal in the electrolyte are available, the galvanic corrosion rate can be estimated by solving the Laplace equation with boundary conditions based on the polarization curves. However, the polarization curves are not always available. In such a case, it is necessary to estimate the density of the current across the metal surfaces from the potential values measured at points far away from the metal surfaces. Since this inverse problem is ill-conditioned, direct application of the conventional method results in an oscillatory solution. To circumvent this problem, an inverse problem is formulated and the boundary element method is employed to estimate the polarization curves. In addition, the estimation accuracy is improved by using a priori information which is expressed as fuzzy membership functions. Sample problems are also presented to demonstrate the effectiveness of this new method.

  • Supplemental Notes:
    • JSME Intl J, Series A, v 38 n 4, Oct 1995, p 541 [6 p, 9 ref, 15 fig]
  • Authors:
    • Amaya, K
    • Togashi, J
    • Aoki, S
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00718561
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 27 1996 12:00AM