Indian Journal of Science and Technology

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The corrosion behavior of aluminium alloy AA2219-T87 welded plates in seawater was investigated using potentiodynamic polarization and EIS techniques. The potentiodynamic polarization curves reveal that heat affected zone (HAZ) is more prone to corrosion than weld zone (WZ) and base metal (BM). This is further confirmed by EIS which showed a decrease of Rct-. The microstructures of AA2219-T87 were made by optical microscopy and SEM. The higher environmental susceptibility of HAZ as compared to BM is caused by the dissolution and segregation of CuAl2 intermetallic particles along the grain boundaries. The corrosion rate of WZ is due to the presence of micro pores and copper rich areas in α-matrix.

Keywords

Aluminium, EIS, SEM, Heat Affected Zone
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