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We present a new approach for real-time monitoring of chemical corrosionbased on the radio-frequency (RF) impedance technology and soft ferromagneticribbons. The impedance (Z) of a commercial magnetic ribbon was measured in realtime for 5 mul of drop-casted HNO3 of various concentrations. Variations in theconcentration of the drop-casted acid were assessed by considering thedifference in Z with and without the acid treatment. We found a large andlinear increase in deltaZ and a large linear decrease in measurement time withthe acid concentration, which are ideal for developing disposable chemicalsensors for strength estimation of corrosive chemicals and for monitoring of atime-dependent chemical corrosion process. Since the ribbon used iscommercially available at low cost and the measurement system is quick and lowpower consuming, the proposed sensor can be used as an easy, quick, andlow-cost chemical probe in industries and environmental hazard managementpurposes.

A Disposable Soft Magnetic Ribbon Based Sensor for Corrosion Monitoring