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Croatica Chemica Acta, Vol. 90 No. 2, 2017.

Original scientific paper

https://doi.org/10.5562/cca3161

Spectroscopical and Electrochemical Characterisation of a (3-Mercaptopropyl)trimethoxysilane - Based Protective Coating on Aluminium Alloy 2024

Mohor Mihelčič ; Department for Materials Chemistry, National Institute of Chemistry Hajdrihova 19, SI-1000 Ljubljana, Slovenia
Angelja K. Surca orcid id orcid.org/0000-0001-5339-4937 ; Department for Materials Chemistry, National Institute of Chemistry Hajdrihova 19, SI-1000 Ljubljana, Slovenia
Ahmed Kreta orcid id orcid.org/0000-0001-9796-3935 ; Department for Materials Chemistry, National Institute of Chemistry Hajdrihova 19, SI-1000 Ljubljana, Slovenia
Miran Gaberšček orcid id orcid.org/0000-0002-8104-1693 ; Department for Materials Chemistry, National Institute of Chemistry Hajdrihova 19, SI-1000 Ljubljana, Slovenia

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Abstract

Coatings based on organic-inorganic hybrids may effectively improve the resistance of metals/alloys against corrosion. In this work the protection ability of a coating based on (3-mercaptopropyl)trimethoxysilane (MPTMS) deposited on the well-known aluminium AA 2024 alloy is studied. The hydrolysis and condensation reactions in the initial sol and the structure of thermally treated protective MPTMS coatings is studied using infrared absorbance spectroscopy. In addition, the structure of coatings is investigated using infrared reflection-absorption (IR RA) spectroscopy. Several physical properties of prepared coatings such as contact angles, surface energy and thickness are reported. The corrosion protection ability of once, twice and three times deposited MPTMS coatings is studied using potentiodynamic polarisation measurements. Finally, possible morphological changes at different potentials of interest are investigated using in situ electrochemical AFM.

This work is licensed under a Creative Commons Attribution 4.0 International License.

Keywords

Corrosion protection; sol-gel coatings; AA 2024; infrared spectroscopy; in situ electrochemical AFM

Hrčak ID:

185319

URI

https://hrcak.srce.hr/185319

Publication date:

3.7.2017.

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