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The Effect of Hydrogen on Corrosion of Tb0.3Dy0.7Fe1.92.

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Title: The Effect of Hydrogen on Corrosion of Tb0.3Dy0.7Fe1.92.
Authors: Sachdeva, Deepika1, Balasubramaniam, R.1 bala@iitk.ac.in
Source: Journal of The Electrochemical Society. Feb2008, Vol. 155 Issue 2, pC75-C80. 6p. 1 Diagram, 4 Graphs.
Subjects: Chemicals, Electrochemical research, Hydrogen, Nonmetals, Magnetostrictive transducers, Ions, Intermediates (Chemistry), Solution (Chemistry), Electrons
Abstract: The effect of hydrogen on the corrosion behavior of rare-earth-based magnetostrictive material Tb0.3Dy0.7Fe1.92 was studied after cathodic charging of hydrogen. The aqueous solutions used for understanding electrocheinical behavior were 3.5% NaCI and 0.01 N Na2SO4, in freely aerated and deaerated conditions. The severity of hydrogen attack in the presence of chloride ions increased with increasing hydrogen charging duration. Terraced and cleavagelike faceted features were evident on the surfaces after hydrogen charging and they were related to hydrogen embrittlement of the material. The destabilizing effect of chloride ions on the surface films, resulting in increased hydrogen uptake and consequent lowering of corrosion resistance, was verified by testing in chloride-free 0.01 N Na2SO4 environment in both freely aerated and deaerated conditions. The material was more tolerant to charged hydrogen in the absence of chloride ions. Protective surface film formation in 0.01 N Na2SO4 solution resulted in improved corrosion resistance of Terfenol-D compared to that in 3.5% NaCI solution. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The effect of hydrogen on the corrosion behavior of rare-earth-based magnetostrictive material Tb0.3Dy0.7Fe1.92 was studied after cathodic charging of hydrogen. The aqueous solutions used for understanding electrocheinical behavior were 3.5% NaCI and 0.01 N Na2SO4, in freely aerated and deaerated conditions. The severity of hydrogen attack in the presence of chloride ions increased with increasing hydrogen charging duration. Terraced and cleavagelike faceted features were evident on the surfaces after hydrogen charging and they were related to hydrogen embrittlement of the material. The destabilizing effect of chloride ions on the surface films, resulting in increased hydrogen uptake and consequent lowering of corrosion resistance, was verified by testing in chloride-free 0.01 N Na2SO4 environment in both freely aerated and deaerated conditions. The material was more tolerant to charged hydrogen in the absence of chloride ions. Protective surface film formation in 0.01 N Na2SO4 solution resulted in improved corrosion resistance of Terfenol-D compared to that in 3.5% NaCI solution. [ABSTRACT FROM AUTHOR]
ISSN:00134651
DOI:10.1149/1.2816226