The Effect of Ambient Ageing on the Corrosion Protective Properties of a Lithium-Based Conversion Layer

Journal article (2023)

Authors

Z. Li Team Arjan Mol - Mechanical, Maritime and Materials Engineering
A.M. Homborg Netherlands Defence Academy, Team Arjan Mol - Mechanical, Maritime and Materials Engineering
Y. Gonzalez Garcia Team Yaiza Gonzalez Garcia - Mechanical, Maritime and Materials Engineering
Peter Visser Akzo Nobel
M. Soleimani Team Peyman Taheri - Mechanical, Maritime and Materials Engineering
J.M.C. Mol Team Arjan Mol - Mechanical, Maritime and Materials Engineering
Research Group
Team Arjan Mol (Mechanical, Maritime and Materials Engineering) (TU Delft)
Copyright: © 2023 Z. Li, A.M. Homborg, Y. Gonzalez Garcia, Peter Visser, M. Soleimani, J.M.C. Mol
DOI
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https://doi.org/10.1149/1945-7111/acc1a6
Ageing Electrochemical noise Aluminium alloy Corrosion inhibition Lithium-based conversion layer
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Published Date

2023

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Materials Science and Engineering

Research Group

Team Arjan Mol

Abstract

The influence of ageing under ambient conditions on the corrosion protective behaviour of a lithium-based conversion layer on AA2024-T3 is studied in this work. Conversion layers aged at ambient conditions for relatively short times (0 h and 4 h), show an initial high degree of corrosion inhibition but a much lower protectiveness after the inhibition stage terminates. Conversion layers with relatively long ageing times (24 h and 72 h) show a rather stable corrosion resistance which is higher than that of short-time aged samples. It is hypothesized that the freshly-formed conversion layer has trapped a certain amount of lithium ions and water molecules, leading to ongoing and heterogeneous growth of the conversion layer with time under ambient indoor conditions. Moreover, conversion layers with short ageing times show early-stage active corrosion protection by lithium-ion release.