Influence of electrodeposition potential, TiO₂ nanoparticles and chromium (III) inhibitor addition on the corrosion protection performance of organosilane coating on aluminium

ABSTRACT

In this work, the anticorrosion properties of phenyl trimethoxysilane (PTMS) films coated on aluminium 5000 series alloys were studied. PTMS films were deposited at various cathodic potentials. The optimum electrodeposition potential was found to be −0.8 V vs. SCE. The coatings were also modified by different amounts of nano-TiO₂. In order to introduce corrosion inhibition and a self-repair property of the PTMS film, the addition of chromium (III) corrosion inhibitor in the presence of nano-TiO₂ was studied. The anticorrosion performance of coatings was investigated in a 3.5 wt.% NaCl solution. At optimum deposition potential, the ‘critical’ nano-TiO₂ and Cr(III) contents were both observed, under which the obtained PTMS coatings show the highest anticorrosion performance. The surface morphologies of PTMS coatings were examined by scanning electron microscopy. The results showed that the coatings deposited at −0.8 V vs. SCE, from 20 ppm of nano-TiO₂ and 0.003 M Cr(III) inhibitor present uniform and compact morphologies.

KEYWORDS:

• Aluminium
• PTMS
• electrodeposition
• TiO₂
• Cr(III) inhibitor

ORCID

Mir Ghasem Hosseini http://orcid.org/0000-0002-3117-8608

Acknowledgements

The authors would like to acknowledge the financial support of the Office in Charge of Research of Iranian Nanotechnology Society and the financial support of the Office of the Vice Chancellor in charge of research of University of Tabriz.

Disclosure statement

No potential conflict of interest was reported by the authors.