Determination of the Effectiveness of Nonchromated Conversion Coatings for Use with IVD Aluminum Coatings.
Abstract
The Air Force Air Logistics Centers (ALCs) have either recently eliminated or have plans to eliminate the usage of cadmium processing for the maintenance and overhaul of aircraft. The thrust of their effort is the elimination of the hazardous cadmium waste streams. The replacement process, ion vapor deposition (IVD) of aluminum, is free of the environmental problems associated with cadmium processing. However, as for cadmium processing, it still requires subsequent treatment with a chromate conversion coating which contains a known carcinogen. This program, then, addressed the effectiveness of nonchromated conversion coatings for use with IVD aluminum coatings. It concentrated on conversion coatings which were also being evaluated by the Aerospace Industry as replacements for chromated conversion coatings on bare aluminum alloys. lVD aluminum-coated steel and aluminum panels, and IVD aluminum-coated steel and titanium fasteners were treated with various candidate nonchromated conversion coatings and then subjected to various environmental exposures. The objective of this program was met in that a nonhazardous conversion coating, which could replace chromate conversion coating on IVD aluminum coatings, was identified and verified. jg p4
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1996
- Accession Number
- ADA306120
Entities
People
- James A. Fournier
- Jim J. Reilly