SYMPOSIA PAPER Published: 01 January 2002
STP10892S

Atmospheric Corrosion Monitoring Sensor in Outdoor Environment Using AC Impedance Technique

Source

An alternating current (AC) impedance technique has been applied to the monitoring of corrosion rate in outdoor environments and humidity chambers. A corrosion sensor used for corrosion rate monitoring consisted of a pair of ring and rod of steel electrodes embedded co-axially in epoxy resin. The instantaneous corrosion rates have been monitored by the continuous measurement of impedance at 10mHz and 10kHz. In comparing corrosion loss obtained from impedance measurement with actual corrosion loss by laser microscope, it was found that the present electrochemical technique could be applied for the atmospheric corrosion monitoring. Furthermore, from the thermodynamic analysis for drying and water absorption process of the artificial seawater, the atmospheric corrosion rate of steels showed its a maximum at an average water film thickness of 100 μ m from 10 μ m.

Author Information

Katayama, H
Corrosion Resistant Materials R. G., National Institute for Materials Science (NIMS), Ibaraki, Japan
Yamamoto, M
Surface Treatment Laboratory, Steel Research Laboratories, Nippon Steel Corp. (NSC), Chiba, Japan
Kodama, T
Corrosion Resistant Materials R. G., National Institute for Materials Science (NIMS), Ibaraki, Japan
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Details
Developed by Committee: G01
Pages: 171–181
DOI: 10.1520/STP10892S
ISBN-EB: 978-0-8031-5467-4
ISBN-13: 978-0-8031-2896-5