Synthesis, characterisation and electrochemical evaluation of a functionalised coating for mild steel corrosion protection

ABSTRACT

A functionalised coating for mild steel corrosion protection was prepared in this study. A composite material SBA-15 (silicon oxide) was used as a mild steel corrosion inhibitor. The porous matrix (SBA-15) was loaded with fluconazole (F), as an inhibitor container. A sol–gel technique was used to synthesise SBA-15; and the active molecule (F) was extracted from an outdated medication using methanol as solvent. The final composite was obtained by SO₂ dispersion in a methanol-F solution. The composite material was dispersed in a nitrocellulose resin, and it was characterised by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM), Fourier Transform Infrared Spectrometry (FTIR), and physical adsorption of Nitrogen. Coatings were electrochemically evaluated by electrochemical impedance spectroscopy (EIS) tests, using a chloride/sulphate solution prepared from NaCl and (NH₄)₂SO₄. The results demonstrated the effectiveness of the inhibitor delivery system and the consequent protection of metal against the corrosion process.

KEYWORDS:

• Smart coating
• porous matrix
• self-healing
• aggressive medium
• corrosion protection

Acknowledgements

The authors thank UAEM – CIICAp and UAM for providing the entire infrastructure to carry out this work.

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Victoria Bustos-Terrones http://orcid.org/0000-0002-4185-7540

Jorge Uruchurtu http://orcid.org/0000-0001-8014-3009

Jesús J. Rochín-Medina http://orcid.org/0000-0003-4731-2792

Karina Ramírez http://orcid.org/0000-0003-0138-992X

Jesús G. Rangel-Peraza http://orcid.org/0000-0003-0764-0185

Mario A. Romero-Romo http://orcid.org/0000-0002-5783-5776

Yaneth Bustos-Terrones http://orcid.org/0000-0001-6445-2071

Additional information

Funding

This work was supported by the CONACYT.