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Serious corrosion was found on 6005A aluminium alloy edge beam on one side of traction converter hung on the car body of a train during maintenance. In order to determine the corrosion reason, the failure analysis of the side beam was carried out by means of macro and micro morphology observation, EDS analysis, metallographic structure inspection, chemical composition analysis, combined with the actual operation status on site. Results showed that there was intergranular corrosion on the 6005A aluminium alloy edge beam. The cracks occurred in the surface and propagated to the interior along the grain boundaries. Because the side beam was in the corrosive environment near the sewage outlet, the intergranular corrosion cracks occurred on the surface of the local area of the edge beam and the substrate on the local surface of material fell off, resulting in the corrosion failure of the edge beam.