Journal
CORROSION SCIENCE
Volume 65, Issue -, Pages 268-277Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2012.08.026
Keywords
Magnesium; EIS; XPS; XRD; Passive films
Funding
- National Natural Science Foundation of China [50901082, Y2F2151111]
- International Science & Technology Cooperation Program of China [2011DFA5090]
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The corrosion mechanism of Mg-Al-CO32- hydrotalcite film is discussed based on its corrosion behavior and the anion-exchange or adsorption effect of Cl-. The results demonstrate that the film is very compact and acts as a barrier against Cl- attack in the early stage. Then the surface of the film is dissolved gradually due to its instability in aqueous solutions. Only after eliminating CO32-, Cl- can insert into the hydrotalcite interlayer to balance charges. Cl- cannot substitute CO32- just in NaCl solution, but can adsorb on active spots of the film to accelerate the decomposition. (C) 2012 Elsevier Ltd. All rights reserved.
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