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96512 PREDICTION OF INITIATION AND PROPAGATION OF CREVICE CORROSION ON ALUMINIUM ALLOYS IN SEA WATER BY MATHEMATICAL MODELLING

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Product Number: 51300-96512-SG
ISBN: 96512 1996 CP
Author: K R Stokes, John W Oldfield, Gary L Masters
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A mathematical model of the initiation of crevice corrosion of aluminium and its alloys in sea water has been developed. The mechanism of the process, which is fundamentally different to that for stainless steels, was established during the development of the model. Practical exposure tests have been carried out on alloys 1050A, 2024-T3, 5083, 6061, 6082, 7010, 8090-T3 and 8090-T851 at DRA’s facilities in Portland Harbour, Weymouth, UK. The model successfully predicts the observations found in these tests with respect to initiation of attack. A simple empirical model of the propagation of attack based on the level of Cu and Zn in the alloy has also been developed. This shows reasonable correlation with the exposure test data. Keywords: Crevice corrosion, aluminium, aluminium alloys, sea water.
A mathematical model of the initiation of crevice corrosion of aluminium and its alloys in sea water has been developed. The mechanism of the process, which is fundamentally different to that for stainless steels, was established during the development of the model. Practical exposure tests have been carried out on alloys 1050A, 2024-T3, 5083, 6061, 6082, 7010, 8090-T3 and 8090-T851 at DRA’s facilities in Portland Harbour, Weymouth, UK. The model successfully predicts the observations found in these tests with respect to initiation of attack. A simple empirical model of the propagation of attack based on the level of Cu and Zn in the alloy has also been developed. This shows reasonable correlation with the exposure test data. Keywords: Crevice corrosion, aluminium, aluminium alloys, sea water.
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