Towards understanding micro-galvanic activities in localised corrosion of AA2099 aluminium alloyShow others and affiliations
2021 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 392, article id 139005Article in journal (Refereed) Published
Abstract [en]
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 (VCPD) 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 VCPD, 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 VCPD 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.
Place, publisher, year, edition, pages
Elsevier Ltd , 2021. Vol. 392, article id 139005
Keywords [en]
AA2099, Atmospheric corrosion, Localised corrosion, Relative humidity, SKPFM, Aluminum alloys, Aluminum corrosion, Atmospheric humidity, Binary alloys, Chlorine compounds, Copper alloys, Copper corrosion, Electrodes, Galvanic corrosion, Iron alloys, Lithium alloys, Metallic matrix composites, Alloy matrix, Aluminides, Chloride induced corrosion, Galvanic interaction, Li$++$, Localized corrosion, matrix, Real time monitoring, Scanning Kelvin probe force microscopy
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:ri:diva-55852DOI: 10.1016/j.electacta.2021.139005Scopus ID: 2-s2.0-85111956003OAI: oai:DiVA.org:ri-55852DiVA, id: diva2:1586841
Note
Funding details: A1881b0061; Funding details: 118C227; Funding details: Agency for Science, Technology and Research, A*STAR; Funding details: National University of Singapore, NUS; Funding details: Kungliga Tekniska Högskolan, KTH; Funding text 1: Financial support for this work was provided by the Agency for Science, Technology and Research (A*STAR), under the RIE2020 Advanced Manufacturing and Engineering (AME) Programmatic Grant No. A1881b0061 . YanHan Liew would like to acknowledge the support of a scholarship from the A*STAR Graduate Academy, and the opportunity from the French Corrosion Institute and KTH Royal Institute of Technology for this collaboration. Cem Örnek is grateful for the financial support by TUBITAK through grant no. 118C227 via the program 2232: International Fellowship for Outstanding Researchers. The authors would like to acknowledge Thomas Osipowicz and Minqin Ren of the Centre for Ion Beam Applications, Department of Physics, Faculty of Science, National University of Singapore for the analysis using the proton beam microscope facilities.; Funding text 2: Financial support for this work was provided by the Agency for Science, Technology and Research (A*STAR), under the RIE2020 Advanced Manufacturing and Engineering (AME) Programmatic Grant No. A1881b0061. YanHan Liew would like to acknowledge the support of a scholarship from the A*STAR Graduate Academy, and the opportunity from the French Corrosion Institute and KTH Royal Institute of Technology for this collaboration. Cem ?rnek is grateful for the financial support by TUBITAK through grant no. 118C227 via the program 2232: International Fellowship for Outstanding Researchers. The authors would like to acknowledge Thomas Osipowicz and Minqin Ren of the Centre for Ion Beam Applications, Department of Physics, Faculty of Science, National University of Singapore for the analysis using the proton beam microscope facilities.
2021-08-232021-08-232023-05-16Bibliographically approved