Heat-transfer corrosion behaviour of cast Al alloy |
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| Authors: | Wei Zhou Naing Naing Aung Anil Choudhary Mouhcine Kanouni |
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| Affiliation: | aPrecision Engineering and Nanotechnology Centre, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;bCiba Specialty Chemicals (India) Limited, Mumbai 400 053, India;cGlobal Applications Center, Ciba Specialty Chemicals Corporation, 540 White Plains Road, Tarrytown, NY 10591, USA |
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| Abstract: | Heat-transfer corrosion behaviour of an ISO 2379 cast Al alloy was studied in antifreeze radiator coolant under heat-rejecting condition. Extensive analyses of microstructures and corroded surfaces were carried out under the optical microscope, scanning electron microscope equipped with energy dispersive spectroscopy and X-ray diffractometer. Heat-rejecting condition led to a cavitation process and cavities were observed within the α-Al matrix. Crevice corrosion was predominant at oxygen depleted regions in heat-transfer corrosion cell. Al2Cu, Al15(Fe,Mn)3Si2 dendrites, Al4Cu2Mg8Si7 and Si phases served as the effective cathodes resulting microgalvanic corrosion at the anodic site of α-Al matrix. |
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| Keywords: | A. Alloy A. Aluminum B. SEM C. Hot corrosion C. Crevice corrosion |
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