Theoretical and experimental study on the effect of stress corrosion on magnetic flux leakage signals

Abstract

Stress corrosion is widespread in engineering materials, which seriously threatens the bearing capacity of the structures. The current study aims to establish a Corrosion-Stress-Magnetic coupling model based on weak magnetic detection technology. This paper proposes a uniform plane current model under stress corrosion by analyzing the corrosion mechanism, and the magnetic field generated by the corrosion current is obtained. The Corrosion-Stress-Magnetic coupling model is established based on the magnetic memory method. Then the Magnetic Flux Leakage (MFL) signals of whole uniform stress corrosion specimens are studied experimentally and theoretically. Particularly, the experimental values of the changes in the slope of the normal MFL component and the amplitude of the tangential MFL component are consistent with the computational values, which indicates that the proposed model is correct and effective in predicting the effect of stress corrosion on the magnetization of a specimen.