Journal
ELECTROCHIMICA ACTA
Volume 427, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140873
Keywords
2098-T351 Al alloy; Friction stir welding; Near-surface deformed layer; Localized electrochemical activity; SECM; Mg2+ ion-selective microelectrode
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2013/13235-6, 2018/06880-6, 2019/11427-1]
- University of La Laguna
- Spanish Ministry of Science, Innovation and Universities (Madrid, Spain) [2022/0000586]
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This study characterized the development of heterogeneous electrochemical activity in the welded zones of an aluminum alloy and detected localized corrosion reactions in the near-surface deformed layer formed upon exposure to a chloride-containing solution.
The development of heterogeneous electrochemical activity in the welded zones of aluminum alloy 2098-T351 by friction stir welding (FSW) associated with the formation of a near-surface deformed layer (NSDL) upon exposure to an aqueous chloride-containing solution was characterized using scanning electrochemical microscopy (SECM) in potentiometric operation. A solid-contact Mg2+ ion-selective microelectrode allowed in situ monitoring of the corrosion reactions sites for magnesium dissolution from different zones of the FSW weld upon exposure to a chloride-containing aqueous environment. In this way, localized corrosion reactions developing in the galvanically coupled joint/heat affected zones (WJ/HAZ) of the weld were detected and imaged with spatial resolution. The most active domains for local Mg2+ concentrations were associated with the HAZ of the retreating side (RS), and these corresponded to Mg oxidation from the Mg-enriched oxide bands in NSDL.
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