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Sensors 2009, 9(12), 10400-10410; doi:10.3390/s91210400

A New Experimental Method for in Situ Corrosion Monitoring Under Alternate Wet-Dry Conditions

State Key Laboratory for Corrosion and Protection of Metals, Institute of Metal Research, Chinese Academy of Science, Shenyang 110015, China
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Received: 3 November 2009 / Revised: 16 November 2009 / Accepted: 17 November 2009 / Published: 21 December 2009
(This article belongs to the Section Chemical Sensors)
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Abstract

A new experimental method was applied in in situ corrosion monitoring of mild steel Q235 under alternate wet-dry conditions. The thickness of the electrolyte film during the wet cycle was monitored by a high-precision balance with a sensibility of 0.1 mg. At the same time, an electrochemical impedance technique was employed to study the effect of film thickness on corrosion rates. Experimental results showed that there was a critical electrolyte film condition for which the corrosion rate reached a maximum during wet-dry cycles. For the substrate, the critical condition could be described by a film thickness of about 17 μm. For the rusted specimen, the critical condition could be described by an electrolyte amount of about 0.038 g, which is equivalent to a film thickness of 38 μm. This monitoring system was very useful for studying atmospheric corrosion of metals covered by corrosion products. View Full-Text
Keywords: alternate wet-dry condition; mild steel; electrochemical impedance spectroscopy (EIS); electrolyte film; electrical balance alternate wet-dry condition; mild steel; electrochemical impedance spectroscopy (EIS); electrolyte film; electrical balance
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Fu, X.; Dong, J.; Han, E.; Ke, W. A New Experimental Method for in Situ Corrosion Monitoring Under Alternate Wet-Dry Conditions. Sensors 2009, 9, 10400-10410.

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