Corrosion Behaviors of Thermal Diffusion Coating on the Surface of Inconel625 Alloy in Chloride Molten Salts

Abstract:

In solar thermal storage system, the mixed chloride molten salt with the higher conversion efficiency than a single molten salt, but they are more corrosive than the often used nitride molten salts. In the presents work, aluminide and chromate coating were prepared on the surface of Inconel625 alloy by thermal packing method. The corrosion behaviors of thermal diffusion coating on the surface of Inconel625 alloy in mixed molten salts at 900°C were studied by using XRD and SEM equipped with EDS in the present work. The results showed that both of the two thermal diffusion coatings have sever corrosion in the mixed chloride molten salts, but thermal diffusion Al coating in the mixed chloride molten salt corrosion is more serious than thermal diffusion Cr coating, because Cr₂O₃ is more easily dissolved in the molten salt than Al₂O₃.

• Periodical: Materials Science Forum (Volumes 809-810)
• Pages: 589-595
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.809-810.589
• Online since: December 2014
• Authors: Hong Fang Ma, Ming Zhu*, Qing Zhu, Yan Li
• Keywords: Chloride Mixture Molten Salts, Corrosion, Oxide Film, Thermal Diffusion Coating

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