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The crevice corrosion of aluminum (99.999 wt. %) in neutral and mildly acidic solutions was investigated. Polarization curves were generated in simulated crevice solutions and potentiostatic crevice corrosion experiments with varying crevice gaps were performed.
Crevice corrosion of aluminum has been studied extensively and several explanations of the mechanism have been proposed. However evidence of significant metal loss due to aluminum crevice corrosion is not well documented. This paper shows evidence of significant corrosion of aluminum within a crevice. The crevice corrosion of aluminum (99.999 wt. %) in neutral and mildly acidic solutions was investigated. Polarization curves were generated in simulated crevice solutions and potentiostatic crevice corrosion experiments with varying crevice gap opening dimensions were performed. Current was measured and in situ photographs of the developing crevice corrosion were obtained.Crevice corrosion of aluminum in a pH 6 0.6M NaCl solution was not found to occur under open circuit or polarized conditions. Crevice corrosion was observed for aluminum in a mildly acidic (pH 3) chloride free solution. In this solution crevice corrosion resulting in severe material loss was observed and a high current (10 mA) was measured. The corrosion occurred in the absence of pitting corrosion. The cause of corrosion in this case could be explained by alkalization of the crevice due to a high rate of hydrogen evolution reaction driven by a potential drop within the crevice.
Keywords: downloadable, Crevice corrosion, pitting corrosion, IR mechanism, chloride, aluminium, sulphate.
Seawater desalination with waste heat from nuclear or fossil power plants is an attractive alternative for the production of potable water.1 Multi-effect desalination process (MED) relies on the evaporation of water from a thin film of seawater.2 The heat of condensation is used in the evaporation of water from a subsequent film of seawater.
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The aim of this work is to analyze the role of corrosion management in prevention of corrosion accidents related primarily to safety of personnel and the environment. This is achieved by anti-corrosion measures, corrosion monitoring, regular inspection, study of each accident, implementation of meetings, publications, education, and knowledge transfer.
To better understand and quantify the effect of crevice geometry, several crevice configurations simulating service conditions were evaluated including flanges assembled with gaskets, bolts mounted with nuts to plates, and the standard CREVCORR-type crevice formers.