Effects of Cations on Corrosion of Inconel 625 in Molten Chloride Salts
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Ming Zhu
,
Hongfang Ma
Abstract
Hot corrosion of Inconel 625 in sodium chloride, potassium chloride, magnesium chloride, calcium chloride and their mixtures with different compositions is conducted at 900°C to investigate the effects of cations in chloride salts on corrosion behavior of the alloy. XRD, SEM/EDS were used to analyze the compositions, phases, and morphologies of the corrosion products. The results showed that Inconel 625 suffers more severe corrosion in alkaline earth metal chloride molten salts than alkaline metal chloride molten salts. For corrosion in mixture salts, the corrosion rate increased with increasing alkaline earth metal chloride salt content in the mixture. Cations in the chloride molten salts mainly affect the thermal and chemical properties of the salts such as vapor pressure and hydroscopicities, which can affect the basicity of the molten salt. Corrosion of Inconel 625 in alkaline earth metal chloride salts is accelerated with increasing basicity.
Funding statement: Funding: This work was financially supported by National Science Foundation of China (NSFC) under the grant nos. 51201131 and Science and Technology Program of Shaanxi Province, China (2013KJXX-42). It was also supported by the National Science Foundation (NSF) CREST Grant HRD-0932421.
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