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Author: Dongfeng He (National Institute for Material Science)
We developed an electromagnetic method to evaluate the corrosion of steel rebar. AC magnetic field was produced by an excitation coil when AC current flow in it. Then, eddy current was induced in the surface of the steel rebar. A detection coil was used to measure the magnetic field produced by the eddy current. The signal after the amplifier was sent to a lock-in amplifier. From the lock-in amplifier, two signals were obtained: X signal (the same phase signal with the excitation current) and Y signal (90 degree phase difference signal with the excitation current). From the slope of the plotted X-Y graph using the X and Y signals, the corrosion of the steel rebar can be judged. We developed a small compact system for the corrosion evaluation of steel rebar, which will be suitable for the field experiments.
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How to Cite: He, D. . (2019) “Development of electromagnetic method to evaluate the corrosion of steel rebar”, Review of Progress in Quantitative Nondestructive Evaluation.(0).