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Effect of deep sea environment on the corrosion behaviour of metals and alloys

Venkatesan, R and Dwarkadasa, ES and Raghuram, AC (1998) Effect of deep sea environment on the corrosion behaviour of metals and alloys. In: Transactions of the Metal Finishers Association of India, 7 (1). pp. 63-71.

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Abstract

Exploration of ocean depths has opened up new avenues of interest to scientists and technologists. In the light of efforts being focussed on offshore drilling, ocean floor mining, etc., there is need for the development of new materials suited for this purpose; Fundamental to the development of such systems is the knowledge of the behaviour of component materials in the deep-sea environment. Several materials used in the fabrication of deep-sea systems deteriorate in service in an unexpected manner unlike their predicted behaviour established in laboratory saline solutions. In deep waters the deterioration is due to the cumulative effect of the environmental conditions of hydrostatic pressure, temperature, pH, dissolved salinity, sea water current, etc. A study has been initiated to study the behaviour of several constructional materials, inclusive of mild steel cupro-nickel, aluminium and its alloys, austempered ductile iron and titanium, in deep seawater environment. Specimen coupons were attached to deep sea moorings at depths ranging from 500-1000 m for a duration of upto 95 days. Weight loss data from the specimens recovered after exposure yielded corrosion rates. Surface morphology of the exposed specimens was studied in the scanning electron microscope. Results obtained with the tested materials curd the general performance in deep sea environment are discussed in. this paper. Environmental factors encountered in deep water and their effect on material behaviour cue reviewd. Results of this study will be useful in. designinig components for nodule mining systems as the long term performance in deep ocean cannot be easily simulated in the laboratory.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Metal Finishers Association.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 19 Jul 2010 09:28
Last Modified: 19 Jul 2010 09:28
URI: http://eprints.iisc.ernet.in/id/eprint/18458

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