Review of micro-scale and atomic-scale corrosion mechanisms of second phases in aluminum alloys
(1. Tianjin Key Laboratory of Composite and Functional Materials, Tianjin 300350, China;
2. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;
3. School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, China;
4. CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
5. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada)
2. School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China;
3. School of Naval Architecture and Ocean Engineering, Dalian University of Technology, Dalian 116024, China;
4. CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
5. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada)
Abstract: Localized corrosion of aluminum (Al) alloys, such as pitting corrosion, intergranular corrosion, and stress corrosion cracking is closely related to the micro-galvanic corrosion between the second phase and the Al matrix. Using high-resolution transmission electron microscopy and first principles calculations, the factors that affect corrosion mechanisms of the second phase in Al alloys at micro-scale and atomic-scale were examined, including the composition and structure of second phase, pH of the environment, stress and adsorption behavior of adsorbates (such as Cl-, H2O, OH- and O2-).
Key words: Al alloys; corrosion; dealloying; first principles calculations