EXFOLIATION CORROSION RESISTANCE OF FILLET ARC-WELDED Cu-LEAN AA7xxx LAP JOINTS

摘要

The susceptibility to intergranular corrosion modes is a major technical issue preventing wide?spread utilization of higher strength welded AA7xxx extruded beam profiles, in the peak-aged T6 condition, in automotive bumper assemblies. A study was undertaken to evaluate the relative exfoliation corrosion resistance (ASTM G85-A2) as a function of joint design parameters, namely the base alloy composition, heat-treated condition and beam orientation after exposure to a cyclic acidified salt spray test. This paper documents the major findings extracted from this study.