Journal
ELECTROCHIMICA ACTA
Volume 392, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139005
Keywords
AA2099; SKPFM; Relative humidity; Localised corrosion; Atmospheric corrosion
Categories
Funding
- Agency for Science, Technology and Research (A* STAR), under the RIE2020 Advanced Manufacturing and Engineering (AME) Programmatic Grant [A1881b0061]
- A* STAR Graduate Academy
- TUBITAK [118C227]
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The micro-galvanic interactions between Cu-Fe-Mn-Li-containing aluminides and the alloy matrix of aluminium alloy AA2099 during chloride-induced corrosion were investigated in-situ, showing that the aluminides can ennoble their neighbouring matrix sites and the anode-to-cathode ratio has dynamic changes during corrosion. Higher local V-CPD activities were recorded during the earliest stages of corrosion, indicating a unique phenomenon in Al-Li AA2099 not seen in other aluminium alloys.
The micro-galvanic interactions between Cu-Fe-Mn-Li-containing aluminides and the alloy matrix of aluminium alloy AA2099 during chloride-induced corrosion were investigated in-situ with real-time monitoring of the local contact potential difference (V-CPD) using the scanning Kelvin probe force microscopy (SKPFM) at controlled relative humidities. The aluminides showed noble potentials and were able to ennoble their neighbouring matrix sites when a cluster of aluminides surrounded the matrix. The matrix, hence, adopted a more positive V-CPD, towards that of the aluminides. The anode-to-cathode ratio changed throughout the corrosion exposure and was seen to show a dynamic character. Much higher local V-CPD activities were recorded during the earliest stages of corrosion, when the Al-Li AA2099 surface was first exposed to high humidities, than in later RH cycles; a phenomenon not seen in other aluminium alloys. (C) 2021 Elsevier Ltd. All rights reserved.
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