Analysis of the surface film formed on Mg by exposure to water using a FIB cross-section and STEM-EDS

作者：Taheri M; Phillips R C; Kish J R^*; Botton G A

来源：Corrosion Science, 2012, 59: 222-228.

DOI：10.1016/j.corsci.2012.03.001

• Magnesium
• STEM
• Passive films

The composition and structure of the surface film formed on pure Mg exposed at the corrosion potential in pure water for 48 h was investigated using a FIB cross-section and STEM-EDS. The surface film formed is duplex in nature, consisting of a thinner, more-porous, nano-crystalline MgO-rich inner layer, and a thicker, less-porous Mg(OH)(2)-rich outer platelet layer. The results are consistent with the theory that a chemical breakdown (hydration) of the bulk inner MgO layer (native oxide) is a necessary precursor step to the corrosion process that leads to the significant thickening of the partially protective outer Mg(OH)(2) layer.

• 出版日期2012-6