Abstract
In this study, diffusion bonding is used to join rods of Zircaloy-4 with stainless steel 304L. The microstructure of the interface of the dissimilar joints was characterized by SEM-EDS and x-ray diffraction (XRD). It consists of three distinct layers, each separately localized in the modified stainless steel and Zircaloy-4 (Zy-4) matrix. The XRD patterns indicate the presence of intermetallics in the diffusion-bonded joints. Joint corrosion was evaluated by potentiodynamic polarization and some aspects were discussed according to the mixed potential theory. The corrosion results indicate the presence of a local galvanic effect. SEM examination of the corroded joints indicates preferential corrosion around the Zy-4/SS304L interface, probably due to residual stresses and the intermetallic compounds generated during diffusion bonding process at high temperature.
Published Version
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