Preparation of cobalt-modified montmorillonite for corrosion inhibition of 2024-T3 aluminium alloy surface

Thu Thuy Thai; Gia Vu Pham; Anh  Truc Trinh

doi:10.15625/2525-2518/20460

Author affiliations

Authors

Thu Thuy Thai Institute for Tropical Technology, Vietnam Academy of Science and Technology https://orcid.org/0000-0002-0901-2388
Gia Vu Pham Institute for Tropical Technology, Vietnam Academy of Science and Technology https://orcid.org/0009-0005-8967-9295
Anh Truc Trinh Institute for Tropical Technology, Vietnam Academy of Science and Technology

DOI:

https://doi.org/10.15625/2525-2518/20460

Keywords:

Co-modified montmorillonite, inhibition corrosion, aluminium alloy

Abstract

In this study, cobalt Co(II) cations were incorporated into the interlayer spaces of the montmorillonite matrix via a cation-exchange reaction, leading to an increase in layer spacing as Na was replaced by Co, as demonstrated by x-ray diffraction analysis. It was observed that Co could be released from the MMTCo matrix into the aqueous medium, with this release being more pronounced in alkaline environments. Electrochemical impedance spectroscopy (EIS) confirmed that MMTCo acts as an effective corrosion inhibitor for the AA2024 surface, with its inhibitive efficiency being concentration-dependent and more significant at higher concentrations. FE-SEM imaging revealed that a protective layer formed on the AA2024 surface immersed in a filtrate containing MMTCo, in contrast to surfaces exposed to the filtrate of MMT, which were significantly attacked.

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