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Abstract Characteristics of pit growth on aluminium were investigated in seawater by methods of electrochemical kinetics, analysis of solution in localized corrosion region, metallography and scanning electron microscope. The changes in pH value and the concentration of chloride ion inside pits were measured, the pitting processes were traced by television microscope. Results showed that the composition of anodic solution within a pit changed a great deal from the bulk solution, and that pits developed along a certain orientation and hydrogen was released in the pit, the rate of pit growth increased with the increase of applied potential or temperature. The cause of escaping hydrogen and its effect were discussed. It was thought that the pit growth were characterized by selfcatalysis and gradually decreased in the later stage.
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Received: 25 August 1987
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