Corrosion evaluation device and corrosion evaluation method

Details Corrosion evaluation device and corrosion evaluation method Corrosion evaluation device and corrosion evaluation method

G - Physics

01

N

G01N 27/83 (2006.01)

Patent

CA 2633691

A corrosion evaluation device for performing a quantitative evaluation of corrosion by measuring a quantity of decrease in the thickness of a magnetic material which is covered by a non magnetic material or a magnetic material which is not covered by a non magnetic material which includes: a magnetic field generating device for generating such a magnetic field that includes the magnetic material in a magnetic path, a Giant Magnet-Resistive effect (GMR) sensor provided with a GMR sensor for detecting a magnetic flux leakage with regard to the magnetic material and converts a change in the magnetic flux into an electrical signal, a thickness reduction calculation portion for calculating a quantity of decrease in the thickness of the magnetic material based on the electrical signal. The corrosion evaluation device precisely performs a quantitative evaluation of corrosion even when the magnetic material, which is to be evaluated, is covered by a non magnetic material.

La présente invention concerne un dispositif d'évaluation de corrosion servant à effectuer une évaluation quantitative de corrosion par mesure de la minceur soit d'un matériau magnétique revêtu d'un matériau non magnétique soit d'un matériau magnétique nu. Le dispositif d'évaluation de corrosion comprend un moyen de génération de champ magnétique qui génère un champ magnétique contenant le matériau magnétique dans une ligne de force, un capteur GMR (à effet de magnétorésistance géante) muni d'un élément GMR qui détecte une fuite de flux magnétique du matériau magnétique, afin de convertir la variation de flux magnétique en un signal électrique, et un moyen de calcul de minceur qui calcule la minceur du matériau magnétique selon le signal électrique. Le dispositif d'évaluation de corrosion effectue une évaluation quantitative de corrosion précise, même si le matériau magnétique à analyser est revêtu d'un matériau non magnétique.

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