STP1421

    Atmospheric Corrosion Monitoring Sensor in Outdoor Environment Using AC Impedance Technique

    Published: Jan 2002


      Format Pages Price  
    PDF Version (228K) 11 $25   ADD TO CART
    Complete Source PDF (7.7M) 11 $109   ADD TO CART


    Abstract

    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.

    Keywords:

    AC impedance technique, steel, atmospheric corrosion, corrosion monitoring, relative humidity


    Author Information:

    Katayama, H
    Researcher and Supervising Researcher, Corrosion Resistant Materials R. G., National Institute for Materials Science (NIMS), Ibaraki,

    Yamamoto, M
    Senior Researcher, Surface Treatment Laboratory, Steel Research Laboratories, Nippon Steel Corp. (NSC), Chiba,

    Kodama, T
    Researcher and Supervising Researcher, Corrosion Resistant Materials R. G., National Institute for Materials Science (NIMS), Ibaraki,


    Paper ID: STP10892S

    Committee/Subcommittee: G01.04

    DOI: 10.1520/STP10892S


    CrossRef ASTM International is a member of CrossRef.