Accession Number : ADA206893

Title :   Primerless Finishing Systems for the Corrosion Protection of Aluminum.

Descriptive Note : Final rept. Oct 87-Sep 88,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DEPT

Personal Author(s) : Hirst, Donald J ; Hegedus, Charles R ; Spadafora, Stephen J ; Eng, Anthony T

PDF Url : ADA206893

Report Date : 19 Sep 1988

Pagination or Media Count : 36

Abstract : A trend to develop primerless systems for military equipment has begun in which a topcoat can be applied directly to surface treated aluminum. Two approaches to obtain a primerless system are currently available and were investigated. In the first approach, a standard sulfuric acid anodized surface was sealed with a polyurethane colloidal suspension. The resulting pretreatment can be directly topcoated. The second approach involved the application of a primerless or self-priming topcoat applied directly to a surface pretreatment. Adhesion, electrochemical impedance spectroscopy, flexibility and corrosion resistance tests were performed on several aluminum substrates to determine the physical properties of the coating-pretreatment systems. The results of this analysis indicate that these primerless systems show promise and should be considered for specific finishing system applications. Keywords: Primerless coating systems; Organic coatings; Corrosion protection; Inorganic pretreatments; Coatings; Primers; Finishes. (kt)

Descriptors :   *ALUMINUM, *COATINGS, *CORROSION INHIBITION, *PRIMERS, ADHESION, COLLOIDS, CORROSION, CORROSION RESISTANCE, ELECTROCHEMISTRY, FINISHES, IMPEDANCE, MILITARY EQUIPMENT, ORGANIC COATINGS, PHYSICAL PROPERTIES, POLYURETHANE RESINS, SPECTROSCOPY, SUBSTRATES, SURFACES, SUSPENSION DEVICES, TEST METHODS

Subject Categories : Coatings, Colorants and Finishes
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE