The galvanic corrosion behaviour of aluminium 3004 and copper with different area ratios were studied in the tropical marine atmosphere at Tuticorin harbour over a period of 426 days. The area ratios of AAl : ACu, studied were 1:1, 1:2, 1:4, 1:8, 2:1, 4:1 & 8:1. The galvanic corrosion behaviour of metals was studied in terms of relative increase in the corrosion rate of aluminium due to galvanic coupling with copper, relative decrease in the corrosion rate of copper due to galvanic coupling with aluminium, and the susceptibility of aluminium to pitting owing to galvanic coupling with copper. The galvanic potential and galvanic current of the system were monitored. Pits of different dimensions ranging from mild etchings to perforations were experienced on the borders and the surfaces of the interface of aluminium in contact with copper. The weathering parameters and the environmental pollutants which have a major role in influencing the galvanic corrosion of metals were also monitored. The corrosion products resulting from galvanic corrosion were analysed using XRD and the pitting on aluminium resulting from galvanic corrosion has been highlighted in terms of pit depth, size and density of pit, using a high resolution microscope. The galvanic corrosion behavior of aluminum 3004 and copper with different area ratios were studied in the tropical marine atmosphere at Tuticorin harbor over a period of 426 days. The area ratios of AA1: ACu, studied were 1: 1, 1: 2, 1: 4, 1: 8, 2: 1, 4: 1 & 8: 1. The galvanic corrosion behavior of metals was studied in terms of relative increase in the corrosion rate of aluminum due to galvanic coupling with copper, relative decrease in the corrosion rate of copper due to galvanic coupling with aluminum, and the susceptibility of aluminum to pitting owing to galvanic coupling with copper. The galvanic potential and galvanic current of the system were monitored. Pits of different dimensions ranging from mild etchings to perforations were experienced on the borders and the surfaces of the interface of aluminum in contact with copper. The weathering parameters and the environmental pollutants which have a major role in influencing the galvanic corrosion of metals were also monitored. The corrosion products resulted from galvanic corrosion were analyzed using XRD and the pitting on aluminum resulting from galvanic corrosion has been highlighted in terms of pit depth, size and density of pit, using a high resolution microscope.