Abstract
The main objective of the study was to investigate the effect of loading cationic corrosion inhibitors into halloysite nanotubes on the corrosion resistance of self-healing coatings derived from these materials. For this purpose, corrosion inhibitors Ce3+/Zr4+ were encapsulated into halloysite clay nanotubes. The encapsulated nanotubes were dispersed into a hybrid silica sol-gel matrix and deposited on magnesium alloy AZ91D substrates by dip coating method. The coatings were cured at 130°C for 1h in air. The bare, matrix sol coated and self-healing sol coated substrates were evaluated for their self-healing and corrosion protection abilities using weight loss experiments, potentiodynamic polarization and electrochemical impedance spectroscopy measurements after immersion in 3.5% NaCl solution for varying time durations between 1h to 24h. These results were further corroborated with those obtained from scanning vibrating electrode technique. The self-healing property and the promising nature of cationic corrosion inhibitor loaded halloysite nanotube based corrosion protection coatings on AZ91D substrates could be confirmed from the present investigations.
Published Version
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