On the Mechanism of Corrosion of Terfenol-D (Tb0.3Dy0.7Fe1.92).
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| Title: | On the Mechanism of Corrosion of Terfenol-D (Tb |
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| Authors: | Sachdeva, Deepika1, Balasubramaniam, R.1 baIa@iitk.ac.in |
| Source: | Journal of The Electrochemical Society. Jul2008, Vol. 155 Issue 7, pC315-C323. 9p. 1 Chart, 1 Graph. |
| Subjects: | Reaction mechanisms (Chemistry), Corrosion resistant materials, Polarization (Electricity), Immersion in liquids, Scanning electron microscopy, Fourier transform infrared spectroscopy, Rare earth metals, Iron, Coating processes |
| Abstract: | The effect of constituent elements Tb, Dy, and Fe on corrosion of Terfenol-D (Tb0.3Dy0.7Fe1.92) was studied by potentiodynamic polarization studies in freely aerated, deaerated, and fully aerated 3.5% NaCl and 0.01 N Na2SO4 solutions. The corrosion products obtained from immersion and cyclic spray tests were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The polarization behavior of Terfenol-D closely resembled that of pure iron in all environments. Characterization of spalled corrosion products after immersion testing revealed a higher rare earth (RE) content. An increase in iron content of the adherent corrosion products with increasing duration of exposure pointed Out the significant role of iron in the general corrosion processes of Terfenol-D. The polarization and characterization results have been related to the dealloying corrosion mechanism, wherein selective dissolution of REs from the surface results in corrosion from an essentially iron-enriched surface. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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