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Corrosion behaviour of sputter-deposited Mg–Zr alloys in a borate buffer solution |
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| Authors: | AA El-Moneim E Akiyama KM Ismail K Hashimoto |
| Affiliation: | aMaterials Science and Engineering Department, Egypt–Japan University of Science and Technology, New Borg Al Arab, Alexandria, Egypt;bStructural Metals Centre, National Institute for Materials Science, Tsukuba 305-0047, Japan;cDepartment of Chemistry, Faculty of Science, University of Cairo, Giza, Egypt;dTohoku Institute of Technology, Sendai 982-8588, Japan |
| Abstract: | Corrosion behaviour of sputter-deposited Mg–Zr alloys was examined in a borate buffer solution of pH 8.7. XRD measurements showed that the alloys were supersaturated with Zr. The addition of 29 at.% Zr or more was very effective in increasing the corrosion resistance of Mg by more than four orders of magnitude. XPS analysis of spontaneously formed passive films revealed that the passive film consisted of double oxyhydroxide composed of enriched tetravalent Zr and divalent Mg cations. The enrichment of Zr cations in the passive film is responsible for the enhanced corrosion resistance of Mg–Zr alloys. |
| Keywords: | A Magnesium A Zirconium A Sputtered films B XPS B XRD C Passive film |
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