Residual stress and its effect on corrosion behaviour of butt jointed Cu-Al alloys

Residual stresses in dissimilar metal joints of copper and aluminium alloys have been measured using an X-ray diffraction technique and estimated by f inite element analysis. The effects of local tensile and compressive residu al stresses in the joints on corrosion in artificial seawater have been inv estigated, using a potentiodynamic polarisation method. Galvanic corrosion at the dissimilar metal weld region may be enhanced by the additional effec t of differential stress induced by welding.