Effects of crystallographic orientation on corrosion behavior of magnesium single crystals

Shin, Kwang Seon, Bian, Ming Zhe and Nam, Nguyen Dang 2012, Effects of crystallographic orientation on corrosion behavior of magnesium single crystals, JOM, vol. 64, no. 6, pp. 664-670, doi: 10.1007/s11837-012-0334-0.

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Title Effects of crystallographic orientation on corrosion behavior of magnesium single crystals
Author(s) Shin, Kwang Seon
Bian, Ming Zhe
Nam, Nguyen Dang
Journal name JOM
Volume number 64
Issue number 6
Start page 664
End page 670
Total pages 7
Publisher Springer New York LLC
Place of publication New York, N. Y.
Publication date 2012
ISSN 1047-4838
Keyword(s) corrosion behaviour
magnesium single crystals
crystallographic orientation
Summary The corrosion behavior of magnesium single crystals with various crystallographic orientations was examined in this study. To identify the effects of surface orientation on the corrosion behavior in a systematic manner, single-crystal specimens with ten different rotation angles of the plane normal from the [0001] direction to the [1010] direction at intervals of 10° were prepared and subjected to potentiodynamic polarization and potentiostatic tests as well as electrochemical impedance spectroscopy (EIS) measurements in 3.5 wt.% NaCl solution. Potentiodynamic polarization results showed that the pitting potential (E pit) first decreased from −1.57 V SCE to −1.64 V SCE with an increase in the rotation angle from 0° to 40°, and then increased to −1.60 V SCE with a further increase in the rotation angle to 90°. The results obtained from potentiostatic tests are also in agreement with the trend in potentiodynamic polarization tests as a function of rotation angle. A similar trend was also observed for the depressed semicircle and the total resistances in the EIS measurements due to the facile formation of MgO and Mg(OH)2 passive films on the magnesium surface. In addition, the amount of chloride in the passive film was found first to increase with an increase in rotation angle from 0° to 40°, then decrease with a further increase in rotation angle, indicating that the tendency to form a more protective passive film increased for rotation angle near 0° [the (0001) plane] or 90° [the (1010) plane].
Language eng
DOI 10.1007/s11837-012-0334-0
Field of Research 099999 Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, TMS
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047969

Document type: Journal Article
Collections: Institute for Frontier Materials
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