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Citation:
　S. Palraj,G. Subramanian and S. Palanichamy.Galvanic Interactions of Aluminium 3004 and ? Brass in Tropical Marine Atmosphere[J].Journal of Marine Science and Application,2014,(4):455-461.[doi:10.1007/s11804-014-1274-6]
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Galvanic Interactions of Aluminium 3004 and ? Brass in Tropical Marine Atmosphere

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Title:
Galvanic Interactions of Aluminium 3004 and ? Brass in Tropical Marine Atmosphere
Author(s):
S. Palraj;  G. Subramanian and S. Palanichamy
Affilations:
Author(s):
S. Palraj;  G. Subramanian and S. Palanichamy
1. CSIR-Central Electrochemical Research Institute, Karaikudi-630006, India 2. Offshore Platform & Marine Electrochemistry Centre, CSIR-CECRI Unit, Harbour Area, Tuticorin-628004, India
Keywords:
aluminium 3004;  ? brass;  galvanic corrosion;  corrosion products;  pitting;  tropical marine atmosphere
分类号:
-
DOI:
10.1007/s11804-014-1274-6
Abstract:
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. AAluminium: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.

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Supported by the CSIR-CECRI under project No. MLP 0008.
Last Update: 2014-12-11