Abstract
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.
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