TY - JOUR
T1 - Resistance improvement of aluminum surface to corrosion through reactions with fluoride ions
AU - Saphier, Magal
AU - Zamir, Oron
AU - Berzansky, Polina
AU - Saphier, Oshra
AU - Meyerstein, Dan
N1 - Publisher Copyright:
Copyright © 2017 by ASME.
PY - 2017/7
Y1 - 2017/7
N2 - The reaction of fluoride ions with alumina was found to strongly depend on the concentration of fluoride ions in the aqueous solution. At low concentrations ([fluoride ions] < 0.1 mol/l in the case of potassium fluoride), the aqueous concentration of aluminum ions is relatively high as measured by using inductively coupled plasma optical emission spectroscopy (ICP-OES), and the aluminum oxide dissolves as a fluoride complex. At high concentrations of fluoride ([fluoride ions] > 0.5 mol/l in the case of potassium fluoride), a new structure is formed on the alumina surface involving fluoride, aluminum, potassium, and oxygen (in the case of potassium fluoride). The structure was characterized by using X-ray powder diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDS). The resulting structure improved the passivation of alumina, the solubility of aluminum ions decreasing compared to the untreated alumina. Aluminum surfaces that were fluoride-treated showed a better resistance to dissolution in both acidic and basic media.
AB - The reaction of fluoride ions with alumina was found to strongly depend on the concentration of fluoride ions in the aqueous solution. At low concentrations ([fluoride ions] < 0.1 mol/l in the case of potassium fluoride), the aqueous concentration of aluminum ions is relatively high as measured by using inductively coupled plasma optical emission spectroscopy (ICP-OES), and the aluminum oxide dissolves as a fluoride complex. At high concentrations of fluoride ([fluoride ions] > 0.5 mol/l in the case of potassium fluoride), a new structure is formed on the alumina surface involving fluoride, aluminum, potassium, and oxygen (in the case of potassium fluoride). The structure was characterized by using X-ray powder diffraction (XRD), scanning electron microscope (SEM), and energy-dispersive X-ray spectroscopy (EDS). The resulting structure improved the passivation of alumina, the solubility of aluminum ions decreasing compared to the untreated alumina. Aluminum surfaces that were fluoride-treated showed a better resistance to dissolution in both acidic and basic media.
UR - http://www.scopus.com/inward/record.url?scp=85046269208&partnerID=8YFLogxK
U2 - 10.1115/1.4036432
DO - 10.1115/1.4036432
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AN - SCOPUS:85046269208
SN - 2332-8983
VL - 3
JO - Journal of Nuclear Engineering and Radiation Science
JF - Journal of Nuclear Engineering and Radiation Science
IS - 3
M1 - 030914-1
ER -