Abstract
The effect of Zr interlayer on the degradation rate in mechanical strength of friction stir welded 6061 Al/AZ31 Mg dissimilar lap joints during corrosion was investigated. The layer thickness of detrimental Al-Mg intermetallic compounds was reduced by the Zr interlayer. The immersion corrosion tests indicated that the Zr interlayer enhanced the corrosion resistance of Al/Mg joint by mitigating the galvanic corrosion at the lap interface to exhibit a 12% reduction in the weight loss for the Al/Zr/Mg joint. The tensile shear tests suggested that a higher residual mechanical strength was obtained for the Al/Zr/Mg joint compared with that of the Al/Mg joint, whose strength loss ratio was decreased from 86% to 67% after adding the Zr interlayer.
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