Abstract
Microstructural changes and corrosion behavior of pure magnesium for different milling times were investigated. The samples with a finer grain size showed poor corrosion resistance because of unstable or metastable protective film formation after immersion in 0.8 wt% NaCl solution. The corrosion resistance did not improve despite the strong (0002) texture of the sample prepared by spark plasma sintering at 500 °C for 0.3 Ks and milling for 2 h. By studying the microstructural changes and texture development, we concluded that the deformation-dependent grain size is the dominant factor controlling the corrosion properties of mechanically milled magnesium. Increased grain boundary densities lead to an enhancement of the overall surface reactivity and, consequently, the corrosion rate.
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Kim, K.R., Ahn, J.W., Kim, GH. et al. Corrosion behavior of magnesium powder fabricated by high-energy ball milling and spark plasma sintering. Met. Mater. Int. 20, 1095–1101 (2014). https://doi.org/10.1007/s12540-014-6023-5
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DOI: https://doi.org/10.1007/s12540-014-6023-5