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Accession Number DE13-1104752
Title Corrosion of High Temperature Alloys in Solar Salt at 400, 500, and 680 Degrees C.
Publication Date Sep 2013
Media Count 45p
Personal Author A. M. Kruizenga D. D. Gill M. LaFord
Abstract Corrosion tests at 400, 500, and 680%C were performed using four high temperature alloys; 347SS, 321SS In625, and HA230. Molten salt chemistry was monitored over time through analysis of nitrite, carbonate, and dissolved metals. Metallography was performed on alloys at 500 and 680%C2%B0C, due to the relatively thin oxide scale observed at 400%C. At 500%, corrosion of iron based alloys took the form of chromium depletion and iron oxides, while nickel based alloys also had chromium depletion and formation of NiO. Chromium was detected in relatively low concentrations at this temperature. At 680%C, significant surface corrosion occurred with metal losses greater than 450 microns/year after 1025 hours of exposure. Iron based alloys formed complex iron, sodium, and chromium oxides. Some data suggests grain boundary chromium depletion of 321SS. Nickel alloys formed NiO and metallic nickel corrosion morphologies, with HA230 displaying significant internal oxidation in the form of chromia. Nickel alloys both exhibited worse corrosion than iron based alloys likely due to preferential dissolution of chromium, molybdenum, and tungsten.
Keywords Alloys
Chromium
Corrosion
Dissolution
Exposure
Grain boundaries
High temperature
Iron alloys
Metallography
Molten salts
Morphology
Nickel based alloys

 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 71G - Corrosion & Corrosion Inhibition
71J - Iron & Iron Alloys
97N - Solar Energy
Corporate Author Sandia National Labs., Livermore, CA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1411
Contract Number DE-AC07-05ID14517

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