On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys

M. Shahabi-Navid; Y. Cao; J. E. Svensson; A. Allanore; N. Birbilis; L. G. Johansson; M. Esmaily

doi:10.1038/s41598-020-78030-w

On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys

M. Shahabi-Navid, Y. Cao, J. E. Svensson, A. Allanore, N. Birbilis, L. G. Johansson, M. Esmaily^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO₂ was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO₂-containing environment, aluminium cations (Al³⁺) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)₂, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism.

Original language	English
Article number	20972
Journal	Scientific Reports
Volume	10
Issue number	1
DOIs	https://doi.org/10.1038/s41598-020-78030-w
Publication status	Published - Dec 2020

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title = "On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys",

abstract = "The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO2 was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO2-containing environment, aluminium cations (Al3+) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)2, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism.",

author = "M. Shahabi-Navid and Y. Cao and Svensson, {J. E.} and A. Allanore and N. Birbilis and Johansson, {L. G.} and M. Esmaily",

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AU - Shahabi-Navid, M.

AU - Cao, Y.

AU - Svensson, J. E.

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AU - Birbilis, N.

AU - Johansson, L. G.

AU - Esmaily, M.

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AB - The surface film on pure magnesium and two aluminium-containing magnesium alloys was characterised after 96 h at 95% RH and 22 °C. The concentration of CO2 was carefully controlled to be either 0 or 400 ppm. The exposed samples were investigated using X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and electron microscopy. The results showed that when the alloys were exposed to the CO2-containing environment, aluminium cations (Al3+) was incorporated into a layered surface film comprising a partially “hydrated” MgO layer followed by Mg(OH)2, and magnesium hydroxy carbonates. The results indicated that aluminium-containing magnesium alloys exhibited considerably less localised corrosion in humid air than pure magnesium. Localised corrosion in the materials under investigation was attributed to film thinning by a dissolution/precipitation mechanism.

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On the early stages of localised atmospheric corrosion of magnesium–aluminium alloys

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