The Significance of Processing Variables on the Adhesion of Sealants and Organic Coatings to Metallic Aircraft Surfaces.

摘要

The report describes the results obtained in a study program to improve adhesion between aircraft type metals and organic coatings currently used. The blister test method was used which uses fluid pressure under the coating through a hole in the substrate to cause adhesive failure. Specimens were evaluated in the 'as prepared'condition as well as after being subjected to hostile environments. Variations of standard surface treatments,application techniques,and adhesion promoting agents were evaluated. Surface treatments consisted of sulfuric acid anodize on aluminum alloy 7075,chromic acid anodize on aluminum alloy 2024,abrasion chemical conversion treatments on titanium alloy Ti 6Al 4V,phosphate chemical conversion treatments on steel 4340,and chromate and phosphate chemical conversion treatments on cadmium plated steel 4340. A total of seven organic coatings and five silanes were used in the evaluations. (Author)