Multi-functional sensing for high-sensitivity detection of initial state of iron rust

Some nondestructive diagnostic methods including various types of corrosion sensor have been investigated. Under these conditions, a new structure of the sensor which has a pair of electrodes and magneto-supply is proposed. Two different states of the sensor, called a surface mode and a penetration mode, are realized by changing the direction of the magnetic field. For the initial state of iron rust, its thickness is sensitively detected in the surface mode, and precisely in the penetration mode. As the result, our proposed sensor can act as a multi-functional-sensing device useful for detecting the initial stale of iron rust.