The effect of Mg on activation of aluminum in pitting corrosion.

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  • SATO Fumihiro
    Materials, Process and Applied Mechanics Research Section, Technical Department, Aluminum & Copper Division, KOBE STEEL, LTD
  • NEWMAN R. C.
    Corrosion & Protection Center (UMIST, UK)

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  • effect of Mg on activation of aluminum in pitting corrosion

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Abstract

The effect of Mg on pitting corrosion of aluminum has been studied in terms of activation, repassivation, in comparison with the effect of Zn. The pitting potential and passive current in 0.5 NaCl were slightly decreased by alloyed Mg, respectively, but the repassivation potential tended to increase. In current transients and open circuit potential measurements, preferential dissolution of Mg, causing an aluminum enrichment, was considered in 6 M HC1 (pit-like solution) . In addition, after immersion in 6 M HC1, the pitting potential increased over the value of pure Al. Therefore, it can be considered that alloyed Mg has little effect to activate aluminum at first, but that aluminum dissolution rate is reduced by an aluminum enrichment caused by the preferential dissolution of Mg in the local environment.

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