Abstract
A chemical system called DNBM which is a mixture of four quaternary ammonium compounds containing dichromate, nitrite, borate and molybdate in an aprotic solvent, was studied as a post treatment to enhance corrosion resistance of the conventional chromate conversion coatings on aluminum alloys. The impedance spectra obtained for this post-treated specimen showed a 100 fold increase in the corrosion resistance over the coating which was not treated with DNBM in a 0.5 M NaCl. This coating did not degrade over 100 hours and was electrically conducting.
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1990
Association for Materials Protection and Performance (AMPP)
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