The effect of pH on the corrosion protection of aluminum alloys in lithium-carbonate-containing NaCl solutions

Journal article (2023)

Authors

E. Michailidou AkzoNobel
P. Visser AkzoNobel
J.M.C. Mol Team Arjan Mol - Mechanical, Maritime and Materials Engineering
A. Kosari Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
H.A. Terryn Vrije Universiteit Brussel
K. Baert Vrije Universiteit Brussel
Y. Gonzalez Garcia Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
Research Group
Team Arjan Mol (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 E. Michailidou, P. Visser, J.M.C. Mol, A. Kosari, H.A. Terryn, K. Baert, Y. Gonzalez Garcia
DOI: https://doi.org/10.1016/j.corsci.2022.110851
More Info
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Published Date

2023

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Arjan Mol

Abstract

The corrosion inhibiting effect of lithium carbonate has been studied over the pH range relevant for atmospheric corrosion conditions at the polymer/metal interface. It is demonstrated that lithium carbonate offers optimum corrosion protection under moderately alkaline conditions attributed to the formation of a protective layer identified as aluminum-lithium layered double hydroxide. It is proposed that an active-to-passive transition occurs in the presence of lithium carbonate under moderately alkaline conditions where anodic dissolution of the aluminum matrix is an important step prior to the formation of the protective layer. After prolonged exposure, the protective layer is uniformly formed on the surface of AA2024-T3 and lithium containing AA2198-T8 covering both the matrix and active intermetallic particles thus hindering further corrosion reactions.