Development of Corrosion Inhibitors and Adhesion Promoters.
Final rept. 4 Apr 72-6 Jul 73,
IIT RESEARCH INST CHICAGO ILL
Pagination or Media Count:
The treatment of aluminum alloys by 1 polyaminocarboxylic acids, 2 hydroxycarboxylic acids, 3 authraquinones, 4 diazo compounds and, 5 phthalocyanine have all been found to result in the deposition of a multimolecular layer of the individual ligands on the oxidic surface of the metal. Considerably improved paint adherence numbers were shown by the chelate-treated coupons over those of the conventional CHEMRITE-treated ones. However, in the salt splash tests, the unpainted coupons which had been chelate-treated showed decidedly more rapid corrosion attack than the CHEMRITE-treated ones. This could be due to the ease of washability of the surface-bound ligand. A pretreatment of the aluminum coupons with 0.5 CHEMRITE followed by surface chelation by alizarin and its analogs and phthalocyanine has shown not only considerably improved paint-adherence but also a satisfactory corrosion protection in comparison with the conventional CHEMRITE-treatment.
- Coatings, Colorants and Finishes
- Properties of Metals and Alloys