Selective dissolution during acid pickling of aluminum alloys by element-resolved electrochemistry
2022 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 404, article id 139737Article in journal (Refereed) Published
Abstract [en]
The surface reactivity and the elemental dissolution of a high-strength aerospace alloy (AA7449-T651) during acid pickling was investigated with element-resolved electrochemistry (AESEC). The results demonstrated a sequential dissolution of Mg, Al, Zn and Cu, following the order of their respective galvanic reactivity in common acid pickling solutions. The enrichment of Cu during pickling with the H2SO4 solution was observed. The effect of oxidizing solution components HNO3 and Fe(III) on Cu dissolution were investigated using an experimental Evans diagram approach.
Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 404, article id 139737
Keywords [en]
AA7449, Acid pickling, AESEC, Alloy, Aluminum, Aluminum alloys, Copper, Dissolution, Electrochemistry, Iron compounds, Aerospace alloys, Cu dissolutions, High-strength, Pickling solutions, Selective dissolution, Solution components, Surface reactivity, High strength alloys
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:ri:diva-57896DOI: 10.1016/j.electacta.2021.139737Scopus ID: 2-s2.0-85121632310OAI: oai:DiVA.org:ri-57896DiVA, id: diva2:1625974
Note
Funding text 1: The authors would like to thank the Agence National Recherche Technologie (ANRT) for partial financing; Dr. Lionel Peguet of Constellium, SE and Dr. Gregory Lefevre of Chimie-ParisTech for useful discussions; and Dr. Patrick Chapon of Horiba European Research Center for assistance with the GDOES experiments.
2022-01-102022-01-102025-09-23Bibliographically approved