| Resumo: | We present a new approach for the real-time monitoring of chemical corrosion based on radio-frequency (RF) impedance technology and soft ferromagnetic ribbons. The impedance (<i>Z</i>) of a commercial METGLAS<sup>®</sup> 2714A ribbon was measured in real time for 5 μL of drop-casted HNO<sub>3</sub> of various concentrations. Variations in the concentration of the drop-casted acid were assessed by considering the difference in <i>Z</i> (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>η</mi></mrow></semantics></math></inline-formula>) with and without the acid treatment. We found a large and linear increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>η</mi></mrow></semantics></math></inline-formula> (from ~5 to ~35 mΩ) and a large linear decrease in measurement time (from ~240 to 70 s) with increases in acid concentration (from 0.9 to 7.4 Molar), which is promising for the development of disposable chemical sensors for the strength estimation of corrosive chemicals and for the monitoring of time-dependent chemical corrosion processes. Since the ribbon used is commercially available at a low cost and as the measurement system is quick and low power-consuming, the proposed sensor can be used as an easy, quick, and low-cost chemical probe in industry and for environmental hazard management purposes.
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