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Corrosion Behavior of Incoloy 800 in Molten Nitrate Salt

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Abstract:

The corrosion behavior of Incoloy 800 as the receiver tube materials in a solar tower field exposed to a mixed molten nitrate salts (KNO3: 40wt.%, NaNO3: 60wt%) at 560°C, has been investigated by several methods. After Incoloy 800 specimens were immersed respectively in molten salts at 560°C for different times (5h, 10h, 20h, 30h, 40h, 60h, and 80h), the weight-loss of specimens were test, the morphology of oxide films on the Incoloy 800 specimens were observed by Optical microscope (OM) and Scanning electron microscopy (SEM), the phase composition of the oxide film were investigated by X-ray diffraction (XRD) and Energy dispersive spectrometer (EDS). The experimental results revealed that the corrosion kinetics of the tested alloy agreed with the parabolic law at 560°C, and the corrosion rate is 91.5μm/year. The analysis of the phase composition shows the oxide films had a duplex layer structure with Fe2O3 in the outer layer, andγ-(Fe,Ni) and Cr2O3 in the inner layer.

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Periodical:

Advanced Materials Research (Volumes 887-888)

Pages:

357-361

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.357

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Online since:

February 2014

Authors:

Yu Jun Zhang*, Lei Lei Xiao, Jun Hua Liu, Mei Ling Liu, Min Hui Fu

Keywords:

Corrosion, Incoloy 800, Molten Salts, Oxidation

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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