Effect of low temperature sensitization on the susceptibility to intergranular corrosion in AA5083 aluminum alloy

Wei, W., Gonzalez Sanchez, Sergio, Hashimoto, Teruo, Prasath Babu, R., Thompson, George and Zhou, Xiaorong (2016) Effect of low temperature sensitization on the susceptibility to intergranular corrosion in AA5083 aluminum alloy. Materials and Corrosion, 67 (4). pp. 331-339. ISSN 0947-5117

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Official URL: http://dx.doi.org/10.1002/maco.201508589

Abstract

The effect of thermal exposure at 70 and 100 °C on intergranular corrosion (IGC) susceptibility of AA5083 alloy has been studied. At both temperatures, metastable β′ phase has been detected at grain boundaries. The thermal exposure resulted in sensitized microstructure in the alloy and, consequently, increased mass loss values during the nitric acid mass loss test (NAMLT). The sensitization of the alloy is related to the formation of the β′ phase. The as-received O temper alloy showed relatively high resistance to IGC and exhibited a discontinuous distribution of the β′ phase precipitates at grain boundaries. After exposure at 70 °C for 480 h, the size of β′ phase precipitate at the grain boundaries slightly increased, resulting in an increased mass loss. After exposure at 100 °C for 240 h, the alloy became severely sensitized due to the more continuous distribution of β′ phase precipitate along the grain boundaries.

Item Type: Article
Uncontrolled Keywords: aluminum; electron microscopy; grain boundary; sensitization
Subjects: H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Becky Skoyles
Date Deposited: 05 Nov 2015 09:31
Last Modified: 11 Nov 2016 15:52
URI: http://nrl.northumbria.ac.uk/id/eprint/24319

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