Accession Number : ADA306120

Title :   Determination of the Effectiveness of Nonchromated Conversion Coatings for Use with IVD Aluminum Coatings.

Descriptive Note : Final rept. Oct 93-Jun 95,

Corporate Author : MCDONNELL DOUGLAS AEROSPACE ST LOUIS MO

Personal Author(s) : Fournier, James A. ; Reilly, Jim J.

PDF Url : ADA306120

Report Date : FEB 1996

Pagination or Media Count : 155

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

Descriptors :   *CONVERSION, *IONS, *ALUMINUM COATINGS, *VAPOR DEPOSITION, MAINTENANCE, ENVIRONMENTS, AIRCRAFT, ALUMINUM ALLOYS, HAZARDS, EXPOSURE(GENERAL), PANELS, CHROMATES, STEEL, CADMIUM, TITANIUM, CARCINOGENS, HAZARDOUS WASTES, AEROSPACE INDUSTRY, FASTENINGS, STREAMS.

Subject Categories : Inorganic Chemistry
      Coatings, Colorants and Finishes
      Properties of Metals and Alloys
      Solid Wastes Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE