Corrosion in Molten Nitrate-Nitrite Salts

Slusser, Joseph W.; Titcomb, J. B.; Dunbobbin, B. R.

doi:10.1007/bf03259692

Cited by 41 publications

(23 citation statements)

References 4 publications

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“…All three types of alloys studied in the present study namely, C-276, C-22 and SS-304 contain 16%, 22% and 18% chromium, respectively (see Table 1). In a previous weight loss study of molten-salt corrosion published by Slusser et al [14] in 1985, it has been reported that, 15-20% chromium containing nickel alloys performed as the best corrosive resistant alloys in molten nitrate-nitrite salts at high temperatures, whereas iron alloys perform poorly even with substantial Cr content [31,32].…”

Section: Resultsmentioning

confidence: 99%

“…In one of the earliest work performed in 1985, Slusser et al [14] have studied the corrosion behavior of nickel and iron based alloys in contact with 'Solar Salt'. They reported that the nickel alloys with 15-20% chromium content showed best corrosion resistance, whereas iron alloys with low or almost zero nickel content exhibited poor corrosion resistance at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the nickel alloys with 15-20% chromium content showed best corrosion resistance, whereas iron alloys with low or almost zero nickel content exhibited poor corrosion resistance at high temperatures. Goods and Bradshaw [15] have reported a corrosion rate value of [6][7][8][9][10][11][12][13][14][15] lm per year at 570°C for two different stainless steels (SS-304 and SS-316) and 5 lm per year at 316°C for a carbon steel (A36), in contact with 'Solar Salt'. Using gravimetric immersion method, corrosion issues caused by Solar Salt at 390 and 550°C have been studied by Fernandez et al [16], on two different stainless steels (types AISI 304 and 430) and low-Cr ($2%) alloy steel (T22).…”

Section: Introductionmentioning

confidence: 99%

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Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

et al. 2015

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h i g h l i g h t sApplicability of NaCl-KCl-ZnCl 2 salts for CSP applications is evaluated. Corrosion rates are estimated by electrochemical and immersion methods. Hastelloys show corrosion rates of <10 lm/year at 800°C under anaerobic conditions. g r a p h i c a l a b s t r a c t a b s t r a c t Higher operating temperatures increase efficiency of the concentrating solar power plants but promote faster corrosion of the pipes and vessels made of Hastelloy or stainless steel materials for the moltensalt mixtures. Hastelloys C-276 and C-22 and stainless steel 304 coupons evaluated in the present study in a eutectic molten salt consisting of 13.4 mol% NaCl, 33.7 mol% KCl and 52.9 mol% ZnCl 2 showed substantially lower corrosion rates in the absence versus presence of air from 200 to 800°C as determined by electrochemical and gravimetric methods. In the presence of air, the corrosion rate for the Hastelloy C-276 in the molten salt was found to diminish with immersion time and converges around $50 lm per year after 4 weeks of immersion at 500°C, which is close to the value $40 lm per year obtained using the electrochemical method at 500°C. For anaerobic corrosion rate estimation, the corrosivity of an alloy sample was examined by immersing in molten salt inside a sealed quartz container without any contact with air, which is possible because the vapor pressure of the eutectic molten salt is only about 0.7 atm at 800°C. The corrosion rate of the Hastelloy C-276 was only 10 lm per year in the molten salt in the absence of air at 800°C, which is extremely low compared to 500 lm per year in conducting corrosion studies in the presence of air at 800°C. The Hastelloy coupons after immersion testing in the absence of air have then been examined also by SEM, and the images did not show any http://dx.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

et al. 2015

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“…Therefore, the appropriate material selection and life time estimation requires intensive hot corrosion studies considering different aspects of corrosion environment and material behavior. Recently, corrosion behavior of the common structural materials such as carbon steels, low‐Cr steels, stainless steels, and in some cases Ni‐base alloys have been studied …”

Section: Introductionmentioning

confidence: 99%

High temperature corrosion in molten solar salt: The role of chloride impurities

Dorcheh

Durham

Galetz

2017

Materials & Corrosion

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The role of chloride impurities in molten NaNO3‐KNO3 (solar salt) mixture on corrosion behavior of low‐chromium ferritic‐martensitic X20CrMoV11‐1 steel (X20) and stainless steel 316 (SS316) was studied at 600 °C. Gravimetric and metallographic methods were employed to characterize the kinetics of oxidation and the resulting corrosion products. Steel X20 showed non‐protective character in both low‐ (up to 0.02 wt% Cl−) and high‐ (up to 0.25 wt% Cl−) chloride salts by forming a thick and non‐compact oxide scale. A significant increase in weight gain was observed when X20 steel was immersed in the high‐chloride‐containing salt. Furthermore, the scale underwent severe deformation. SS316 showed superior corrosion resistance in both low‐ and high‐chloride salts. Oxide scales formed on both steels included two zones: an outer Na‐rich oxide and an inner mixed oxide based on Fe2O3 and Fe3O4 structures. The morphology and composition of these zones were significantly different on X20 and SS316 steels. A passive Cr‐rich oxide layer at the metal/oxide interface was characterized as a protective layer. In the case of stainless steel 316 this layer showed even higher continuity when tested in the high‐chloride salt resulting in better protection during the isothermal test.

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“…The stainless steels and nickel‐based alloys employed in this research are containing 18, 16.28, 16, and 22% chromium, respectively (see Table ). In the previous research by Slusser et al, 15–20% chromium containing nickel‐based alloys performed as the better corrosion resistant alloys in molten salts at high temperatures, compared to the iron‐based alloys that performed poorer even with higher chromium composition.…”

Section: Resultsmentioning

confidence: 86%

Investigation on static and dynamic corrosion behaviors of thermal energy transfer and storage system materials by molten salts in concentrating solar power plants

Wang

Jiang

et al. 2018

Materials & Corrosion

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With the emergence of the concentrating solar power (CSP) technology, the corrosion behaviors of potential materials applied in thermal energy transfer and storage system attract tremendous attentions. Corrosion behaviors of X80 carbon steel, 304, 316L stainless steels, and 600, 825 nickel alloys in the molten salt mixtures at different temperatures were comparatively investigated using immersion tests under static and dynamic states and electrochemical scans. The corrosion resistance of stainless steels and nickel‐based alloys in molten salt at 530 °C followed the sequence of 304<316L<600<825. The aggressiveness of different molten salt mixtures was compared, indicating that the ternary system was more aggressive than the binary system. The corrosion aggressiveness under dynamic state was more severe when compared to that under the static state. The N2 atmosphere was proved to be protective for alloys immersed in high temperature molten salts.

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Corrosion in Molten Nitrate-Nitrite Salts

Cited by 41 publications

References 4 publications

Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

Vapor pressure and corrosivity of ternary metal-chloride molten-salt based heat transfer fluids for use in concentrating solar power systems

High temperature corrosion in molten solar salt: The role of chloride impurities

Investigation on static and dynamic corrosion behaviors of thermal energy transfer and storage system materials by molten salts in concentrating solar power plants

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