Anodic Polarization Behavior of Nickel and Nickel-Chromium Alloys in Molten Na&lt;sub&gt;2&lt;/sub&gt;SO&lt;sub&gt;4&lt;/sub&gt;

Hara, Mitsuhiro; Shinata, Yutaka; Nishi, Yoshizumi

doi:10.3323/jcorr1974.35.2_67

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“…On the other hand, we have investigated the anodic and cathodic polarization behavior of a Pt electrode in fused Na 2 SO 4 . As a result, we found that SO 3 gas evolution occurs by the oxidation reaction of SO 4 2À under anodic polarization, 7) and then SO 3 reacts with O 2À in the fused Na 2 SO 4 to decrease the O 2À activity of the fused Na 2 SO 4 , while the O 2À ions, generated by the reduction reaction of SO 4 2À under cathodic polarization, 8) increase the O 2À activity. This result shows that the control of the O 2À activity of fused Na 2 SO 4 by electrochemical polarization is possible.…”

Section: Introductionmentioning

confidence: 91%

Solubility of Metal Oxides under Control of Basicity by Electrolysis in Fused Na2SO4

et al. 2004

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powders under the control of the O 2À activity of fused Na 2 SO 4 by electrochemical polarization was investigated. As a result, the increase in the quantity of electricity for the anodic reaction with increasing polarization potential for the platinum electrode caused an increase in the basicity(À log a Na2O ) of the fused Na 2 SO 4 , while the increase in the quantity of electricity for cathodic reaction with decreasing polarization potential caused a decrease in basicity of the fused Na 2 SO 4 . The solubility of NiO and Co 3 O 4 in fused Na 2 SO 4 increased in the anodic potential region. However, their solubility did not increase in the cathodic potential region. The solubility of Fe 2 O 3 and Fe 3 O 4 slightly increased in the anodic potential region. The solubility of SiO 2 did not increase in the anodic potential region, whereas the solubility of SiO 2 increased with a decrease in the polarization potential in the cathodic potential region. The solubility of Al 2 O 3 and Cr 2 O 3 increased in the cathodic and anodic potential regions. The solubility of Al 2 O 3 was larger than that of Cr 2 O 3 . We found that the resistance of acid and basic dissolution for oxides could be estimated by the electrochemical polarization method.

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Section: Introductionmentioning

confidence: 91%