Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8023232 | Surface and Coatings Technology | 2018 | 48 Pages |
Abstract
In the present study, aluminum pillared montmorillonite clay was modified with cationic corrosion inhibitors Ce3+/Zr4+. The modification of the montmorillonite clay was carried out by two methods; (a) by simple mixing of inhibitor solutions along with clay by stirring for 30â¯min and (b) by homogenization of inhibitor solutions and clay for a very short time of 15â¯min followed by evacuation. The modified and as-received clays were dispersed in hybrid organic-inorganic sol-gel matrix silica sol, which were coated on magnesium alloy AZ91D and cured in air at 130â¯Â°C for 1â¯h. Corrosion protection ability of coatings was evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization and weight loss measurements after exposure to 3.5â¯wt% NaCl solution for different exposure durations between 24â¯h to 120â¯h. Coatings were evaluated for their self-healing ability using scanning vibrating electrode technique for varying time duration from 1â¯h to 24â¯h. Coatings generated with the sol using the pillared montmorillonite clay after modification as described in (b) were found to exhibit better anticorrosive properties even after prolonged exposure to the corrosive medium.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Swapnil H. Adsul, T. Siva, S. Sathiyanarayanan, Shirish H. Sonawane, R. Subasri,