Aluminum alloy products with improved bonding durability and / or phosphorus-containing surfaces, and methods of making them.

摘要

Aluminum alloy products, as well as methods for making and processing such products, are disclosed. Therefore, aluminum alloy products exhibiting controllable surface properties including excellent bonding durability, low contact resistance, and corrosion resistance are disclosed. The aluminum alloy products described herein include a mobile element, a subsurface portion having a certain concentration of mobile element, and a bulk portion having a certain concentration of mobile element. Aluminum alloy products contain a concentration ratio of 4.0 or less, and the concentration ratio is the ratio of the concentration of moving elements in the subsurface portion to the concentration in the bulk portion. Further, the surface and / or subsurface of the aluminum alloy product may contain phosphorus (for example, elemental phosphorus or phosphorus oxide). The phosphorus-containing surface provides a reduction in electronic stress on the electrode tip of the resistance spot welder and an extension of the useful life of the electrode tip (eg, the welding cycle to breakage). [Selection diagram] Fig. 1