The galvanic corrosion behaviour of aluminium 3004-∝brass with different area ratios was studied in the tropical marine atmosphere at Tuticorin harbour over a period of 426 days. The area ratios, viz. A Aluminium:A∝ brass, studied were 0.125, 0.25, 0.5, 1, 2, 4 and 8. The galvanic corrosion behaviour of the metals was studied in terms of the relative increase in the corrosion rate of aluminium due to galvanic coupling with ∝ brass, the relative decrease in the corrosion rate of ∝ brass due to galvanic coupling with aluminium, and the susceptibility of aluminium to pitting owing to galvanic coupling with ∝ brass. 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 ∝ brass. The corrosion products resulting from galvanic corrosion were analysed using XRD and the pitting on aluminium as a result of galvanic corrosion was highlighted in terms of pit depth, size and density of pit, using a high resolution microscope. The most favourable area ratio of aluminium-∝ brass in marine atmosphere in terms of gravimetric corrosion rate is 8:1 and the most unfavourable area ratio of aluminium-∝ brass is 1:4. The galvanized corrosion behavior of aluminum 3004-αbrass with different area ratios was studied in the tropical marine atmosphere at Tuticorin harbor over a period of 426 days. The area ratios, viz. A Aluminum: Aα brass, studied were 0.125, 0.25, 0.5, 1, 2, 4 and 8. The galvanic corrosion behavior of the metals was studied in terms of the relative increase in the corrosion rate of aluminum due to galvanic coupling with α brass, the relative decrease in the corrosion rate of α brass due to galvanic coupling with aluminum, and the susceptibility of aluminum to pitting due to galvanic coupling with α brass. 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 α brass. The corrosion products resulting from galvanic corrosion were analyzed using XRD and the pitting on aluminum as a res ult of galvanic corrosion was highlighted in terms of pit depth, size and density of pit, using a high resolution microscope. The most favourable area ratio of aluminum-alpha brass in marine atmosphere in terms of gravimetric corrosion rate is 8: 1 and the most unfavorable area ratio of aluminum-α brass is 1: 4.