Development of Corrosion Inhibitors and Adhesion Promoters.
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 25, 1973
- Accession Number
- AD0770627
Entities
People
- K. S. Rajan
- P. K. Ase
Organizations
- IIT Research Institute