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Anodic Behavior of Ni48Fe47Cu5 and Ni42Fe38Cu20 in Potassium-Rich NaF-KF-AlF3-Al2O3 Melts.
- Source :
- JOM: The Journal of The Minerals, Metals & Materials Society (TMS); Jul2024, Vol. 76 Issue 7, p3275-3283, 9p
- Publication Year :
- 2024
-
Abstract
- The anodic behavior of Ni<subscript>48</subscript>Fe<subscript>47</subscript>Cu<subscript>5</subscript> and Ni<subscript>42</subscript>Fe<subscript>38</subscript>Cu<subscript>20</subscript> alloys in NaF-KF-AlF<subscript>3</subscript>-Al<subscript>2</subscript>O<subscript>3</subscript> electrolyte was studied using electrochemical methods, such as chronopotentiometry, chronoamperometry, and linear sweep voltammetry at 770°C. The cryolite ratio and potassium ratio were 1.3 and 0.7, respectively. The steady-state polarization curves were obtained before and after galvanostatic polarization for 2 h. The current densities in the passivation region were lower for both anodes after polarization than before, indicating the formation of a protective passive layer during polarization. When anodes were subjected to potentiostatic polarization at 2.2 V (vs. reference), a passive film was readily formed. Linear sweep voltammograms were obtained on Ni<subscript>48</subscript>Fe<subscript>47</subscript>Cu<subscript>5</subscript> and Ni<subscript>42</subscript>Fe<subscript>38</subscript>Cu<subscript>20</subscript> alloys, and the polarization resistances were 5.227 Ω cm<superscript>−2</superscript> and 5.968 Ω cm<superscript>−2</superscript>, respectively. During the galvanostatic electrolysis, the anodic potential (vs. reference) constantly varied with time for the Ni<subscript>48</subscript>Fe<subscript>47</subscript>Cu<subscript>5</subscript> anode. In contrast, the anodic potential of Ni<subscript>42</subscript>Fe<subscript>38</subscript>Cu<subscript>20</subscript> remained almost constant throughout the electrolysis. The thickness of the oxide layer formed on the anodes Ni<subscript>48</subscript>Fe<subscript>47</subscript>Cu<subscript>5</subscript> and Ni<subscript>42</subscript>Fe<subscript>38</subscript>Cu<subscript>20</subscript> after 2 h of electrolysis were around 90 μm and 30 μm, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10474838
- Volume :
- 76
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- JOM: The Journal of The Minerals, Metals & Materials Society (TMS)
- Publication Type :
- Academic Journal
- Accession number :
- 177950704
- Full Text :
- https://doi.org/10.1007/s11837-024-06512-7