Synergistic effects of corrosion and slow strain rate loading on the mechanical and electrochemical response of an aluminium alloy. (June 2019)

• Record Type: Journal Article
• Authors: Zheng, Xinzhu; Castaneda, Homero; Gao, Huajian; Srivastava, Ankit
• Is Part Of: Corrosion science. Volume 153(2019)
• Page Start: 53
• Page End: 61
• Publication Date: 2019-06
• Subjects: Aluminium (A) -- EIS (B) -- SEM (B) -- Effects of strain (C) -- Intergranular corrosion (C) -- Stress corrosion (C); Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.03.018
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Characterized the effect of corrosion and tensile straining on mechanical properties. Emerging electrochemical response of the material characterized using EIS. Initial EIS measurements differ significantly for no load and load conditions. Failure mechanism is rationalized using a qualitative fracture mechanics analysis. Abstract: Tensile specimens of an aluminium alloy, AA7075, with grains aligned parallel to the tensile axis are subjected to a range of slow strain rate tensile loading in a very low pH corrosive environment. The degradation in mechanical response together with the emerging electrochemical characteristics of the material using electrochemical impedance spectroscopy (EIS) are characterized. The EIS measurements coupled with the post-mortem microscopic characterization of the specimens provide an unprecedented view of all the interfacial phenomena affecting the mechanical response of the material. A failure mechanism of the material under consideration is proposed and rationalized by a qualitative fracture mechanics analysis.