Evaluation of Degradation of Protective Coating Systems by X-ray Photoelectron Spectroscopy

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  • A. M. MONSADA
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University
  • HAYASHI S.
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University
  • SEKIYAMA Y.
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University
  • YUASA M.
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University Institute of Colloid and Interface Science, Science University
  • SEKINE I.
    Department of Industrial Chemistry, Faculty of Science and Technology, Science University

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  • X線光電子分光法による防食塗装系の劣化評価

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The degradation behavior of a protective coating system composed of long-oil alkyd resin paint and steel in an aqueous NaCl solution was evaluated by the use of X-ray photoelectron spectroscopy (XPS). The apparent percentages of corroded area determined by XPS corresponded to the coating film resistance determined by electrochemical impedance spectroscopy. The XPS was a more sensitive analytical method in comparison with visual observation and was able to detect initial, and low level of corrosion not seen by visual observation. It is suggested that the degradation behavior of protective coating system could be evaluated by determining the apparent percentage of corroded area using XPS.

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