Evaluation of Non-Chromated Etch for Aluminum Alloys (P-Etch).

摘要

The purpose of the work performed under this program is to evaluate the new chromate free etchant developed by US Army (ARRADCOM) for use in the preparation of aluminum alloys for adhesive bonding. The objective of the program is to generate data which will determine the suitability of the etchant for production use. It will establish the operational control procedures necessary for scale-up to production size and the impact of the solution on existing state-of-the-art waste disposal techniques will be studied. The surfaces produced will be studied to establish their chemical and physical nature. Selected adhesives will be used to explore the effects of solution concentration limits, solution life and storage time prior to bonding, as well as resistance to water immersion, high humidity, salt spray, heat, and cold, and immersion in fuel, lubricating oil and hydraulic fluid. In each case where applicable, panels prepared by the standard FPL etch treatment will be used as controls. The P-Etch will be used as a pretreatment prior to chromic acid and phosphoric acid anodize, and the resultant anodic treated surfaces will be tested for bondability and durability of the bonded joints.