Monitoring the Degradation Process of Inconel 600 and its Aluminide Coatings under Molten Sulfate Film with Thermal Cycles by Electrochemical Measurements
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With a specially designed electrochemical cell, the changes in impedance behavior for Inconel 600 andaluminide diffusion coatings under molten sulfate film with thermal cycles (from 800 ˚C to 350 ˚C) weremonitored with electrochemical impedance measurements. It was found that corrosion resistance for bothmaterials increased with lower temperatures. At the same time, the state of molten salt was also monitoredsuccessfully by measuring the changes in impedance at high frequency, which generally represents the resistanceof molten salt itself. After two thermal cycles, both Inconel 600 and aluminide diffusion coatings showedexcellent corrosion resistance. The results from SEM observation and EDS analysis correlated well withthe results obtained by electrochemical impedance measurements. It is concluded that electrochemical impedanceis very useful for monitoring the corrosion resistance of materials under molten salt film conditions evenwith thermal cycles.
Abstract
With a specially designed electrochemical cell, the changes in impedance behavior for Inconel 600 andaluminide diffusion coatings under molten sulfate film with thermal cycles (from 800 ˚C to 350 ˚C) weremonitored with electrochemical impedance measurements. It was found that corrosion resistance for bothmaterials increased with lower temperatures. At the same time, the state of molten salt was also monitoredsuccessfully by measuring the changes in impedance at high frequency, which generally represents the resistanceof molten salt itself. After two thermal cycles, both Inconel 600 and aluminide diffusion coatings showedexcellent corrosion resistance. The results from SEM observation and EDS analysis correlated well withthe results obtained by electrochemical impedance measurements. It is concluded that electrochemical impedanceis very useful for monitoring the corrosion resistance of materials under molten salt film conditions evenwith thermal cycles.
참고문헌 (8)
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