A process for surface modification of Al‐based materials is described which involves immersion in boiling Ce ( NO 3 ) 3 and CeCl 3 , followed by anodic polarization in a molybdate solution. Each of these three steps is carried out for 2 h. Al 6061 treated in this manner did not show any signs of uniform or localized corrosion during immersion in 0.5 N NaCl for 60 days. A sample with a scratch in the modified surface also did not show any corrosion after 25 days in NaCl . Since this surface modification process produces exceptional corrosion resistance, it should be considered as a candidate for the replacement of chromate conversion coatings.
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Mansfeld et al. (1991) studied this question.