逆解析による走査型振動電極腐食評価法の精度向上

概要

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The Scanning Vibrating Electrode Technique is an effective and non-destructive technique to evaluate the amount of pitting or intergranular corrosion by measuring the electropotential field near the surface of metal sample submerged in an electrolyte. However, the accurate determination of correct electropotential field is difficult, when the sensor probe approaches the metal surface and disturbes the field by itself. In order to overcome this difficulty, an inverse problem, in which the true current density distribution along the metal surface is estimated from the data having errors due to the disturbance, was solved in this paper. The 3-D boundary element method was used to deal with the governing Laplace equation. The ill condition of the inverse problem was overcome by proposing the following procedures. (1)A form of the polarization curve is presumed and the number of unknown parameters is reduced. Then the current density distribution along the metal surface is determined. (2)In order to improve the accuracy, additional electropotential is applied to the sample by a potentiostat and various data are obtained for different electropotential fields. B using the above procedures, the numerical simulation of a sample specimen was carried out. The computed results showed a significant improvement in measuring accuracy by using the inverse analysis.
社団法人日本材料学会の論文
1995-02-15