Strength and Corrosion Resistance of Ultrasonically Soldered Aluminum Joints

摘要

Ultrasonic soldering techniques were effectively used to prepare aluminum joints with a variety of tin-base, cadmium-base, and zinc-base solders. Corrosion resistance of the joints was evaluated by determining strength decay resulting from alternate immersion in 3.5% salt solution and comparison with earlier re¬sults in a boiling, aerated, distilled water environment. The most effective solder for salt-water immersion was 95% zinc-5% aluminum-silicon alloy which had been stress-relief-annealed after the joint was prepared. Other solders containing zinc content of 14% or greater alloyed with tin and/or aluminum showed comparatively good resistance in this environment. Tin-base solders containing small percentages of zinc or copper had been most effective for distilled-water immersion. It was con¬cluded that solders for aluminum joints must be selected specif¬ically for the environments in which they are to be used.