Hot Corrosion Behavior of Ni20Cr Alloy in NaVO3 Molten Salt

Silva-Leon, P. D.; Sotelo-Mazón, O.; Salinas-Solano, G.; Porcayo-Calderón, J.; Valdez, S.; Martínez-Gómez, L.

doi:10.1007/s11665-019-04235-4

Cited by 4 publications

(4 citation statements)

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“…It has been reported [ 18 ] that this signal is due to the superposition of the peaks corresponding to Ni (1 1 1) 2θ = 44.505° and Cr (1 1 1) 2θ = 44.390°, which suggests the formation of a Ni-Cr solid solution. Similar diffractograms have been reported in other studies for Ni-Cr alloys [ 16 , 19 , 20 ]. The diffractograms of the corroded surfaces did not show significant changes with respect to that observed for the noncorroded alloy.…”

Section: Resultssupporting

confidence: 89%

“…Based on the above and due to the low changes in mass recorded, it can be inferred that the Ni20Cr alloy shows excellent corrosion resistance in Solar Salt. This is consistent with previously reported studies where the Ni20Cr alloy and its coatings [14][15][16] exhibited excellent corrosion resistance in the presence of more aggressive molten salts (rich in chlorides and vanadates) and at higher temperatures.…”

Section: Corrosion Testssupporting

confidence: 93%

“…Similar behavior has been observed for this alloy when evaluated as a coating in chloride-rich media (ZnCl 2 -KCl) at 450 °C; its Icorr values were around 4 mA/cm 2 and 28 mA/cm 2 when applied by combustion powder spray [ 14 ] and the HVOF process [ 15 ], respectively. Similarly, the alloy evaluated in vanadium salts (NaVO 3 ) at 700 °C showed Icorr values of 0.5 mA/cm 2 [ 16 ]. However, with the addition of La(NO 3 ) 3 , it was observed that its presence caused an increase in the corrosivity of the Solar Salt.…”

Section: Resultsmentioning

confidence: 99%

“…Because the Ni20Cr alloy is considered a model system that would represent the expected behavior of Ni-based superalloys [ 13 ], its performance in molten nitrate salts is reported in this study. Although various studies have indicated that the Ni20Cr alloy shows a remarkable performance in molten salts rich in chlorides and vanadium species [ 14 , 15 , 16 ], to date, its performance in molten nitrates has not been reported. Its behavior was evaluated by means of mass change tests, at different temperatures and immersion times, and by means of potentiodynamic polarization curves.…”

Section: Introductionmentioning

confidence: 99%

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Behavior of Ni20Cr Alloy in Molten Nitrate Salts

Gomez-Guzman

Lopez-Dominguez

Arrieta-González

et al. 2022

IJMS

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This study reports the behavior of the Ni20Cr alloy in molten nitrate salts. Its behavior was evaluated in the eutectic mixture called Solar Salt (binary salt) and in a ternary mixture (90% Solar Salt and 10% lanthanum nitrate). The addition of lanthanum nitrate was performed to determine if the presence of the La3+ cation could act as a corrosion inhibitor. Through mass loss and potentiodynamic polarization studies, the effects of both electrolytes on the corrosion resistance of the alloy at 300, 400, and 500 °C and at exposure times of 250, 500, 750, and 1000 h were determined. The results showed an increase in the corrosivity of the ternary salt, due to a decrease in its melting point and an increase in the concentration of nitrate ions. However, it was observed that the La3+ cations formed a protective layer (La2O3) on the alloy surface. In both corrosive media, the Ni20Cr alloy showed excellent corrosion resistance, due to its ability to form protective layers of Cr2O3, NiO, and NiCr2O4, in addition to the presence of a layer of La2O3 in the case of the ternary salt.

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Section: Resultssupporting

confidence: 89%

Section: Corrosion Testssupporting

confidence: 93%