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Multiplexed Sensor Array for Accurate Time-of-Wetness (TOW) Measurement

Picture for Multiplexed Sensor Array for Accurate Time-of-Wetness (TOW) Measurement
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In this work, we use electrochemical impedance spectroscopy (EIS) to observe the response of a single interdigital transducer (IDT) sensor to different wetting conditions, including electrolyte volumes and concentrations. Deliquescence of solid salt particles in a dynamic-humidity atmosphere is examined.

Product Number: 51317--9370-SG
ISBN: 9370 2017 CP
Author: Nathaniel Sutton
Publication Date: 2017
Industry: Science of Corrosion
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A variety of factors influence atmospheric corrosion of metals including time-of-wetness (TOW) relative humidity (%RH) structure geometry and the presence contaminant particles among others. Furthermore different areas of the same structure may experience different wetting patterns surface temperatures and local relative humidity. However current technology is limited detecting the presence of water through conduction of an electrolyte by measuring galvanic current resistance or impedance. Wetness is determined by comparing the sensor output to a predefined threshold value. In many cases such parameters correlate poorly to physical corrosion phenomena.In this work we attempt to demonstrate the functionality of a miniature sensor array for accurate Time of Wetness (TOW) measurement. The array consisting of 5 by 5 interdigital transducer (IDT) based sensors aims to both (1) determine the ratio of wetted area on the surface and (2) distinguish between electrolytes of varying conductivity. Preliminary experiments performed with a single IDT sensor have demonstrated the feasibility of such differentiation.Our multiplexed TOW sensor array aims to serve an important need across many industries to accurately describe atmospheric corrosion. It is expected that this new type of sensor array will generate reliable data from the field which will provide important information on the corrosion reaction. This may help guide decisions on more relevant laboratory testing (e.g. coating evaluation) asset protection service-life determination and computational modelling.

Key words: time of wetness, atmospheric corrosion, electrochemical impedance spectroscopy, interdigital transducer sensor

A variety of factors influence atmospheric corrosion of metals including time-of-wetness (TOW) relative humidity (%RH) structure geometry and the presence contaminant particles among others. Furthermore different areas of the same structure may experience different wetting patterns surface temperatures and local relative humidity. However current technology is limited detecting the presence of water through conduction of an electrolyte by measuring galvanic current resistance or impedance. Wetness is determined by comparing the sensor output to a predefined threshold value. In many cases such parameters correlate poorly to physical corrosion phenomena.In this work we attempt to demonstrate the functionality of a miniature sensor array for accurate Time of Wetness (TOW) measurement. The array consisting of 5 by 5 interdigital transducer (IDT) based sensors aims to both (1) determine the ratio of wetted area on the surface and (2) distinguish between electrolytes of varying conductivity. Preliminary experiments performed with a single IDT sensor have demonstrated the feasibility of such differentiation.Our multiplexed TOW sensor array aims to serve an important need across many industries to accurately describe atmospheric corrosion. It is expected that this new type of sensor array will generate reliable data from the field which will provide important information on the corrosion reaction. This may help guide decisions on more relevant laboratory testing (e.g. coating evaluation) asset protection service-life determination and computational modelling.

Key words: time of wetness, atmospheric corrosion, electrochemical impedance spectroscopy, interdigital transducer sensor

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