The Influence of Sample Preparation Techniques on Aluminium Alloy AA2024-T3 Substrates for Sol-Gel Coating

Sol-gel coatings provide environmentally friendly surface protection for metals and can replace toxic pre-treatments such as those based on hexavalent chromium metal alloys. This project ultimately aims to develop silica-based organic–inorganic sol-gel derived thin film possessing anti-corrosion anti-fouling properties aluminium alloy substrates. As with any coating, sample preparation plays a significant role in the performance of coating. Therefore, it was necessary define method that combines removal contaminants roughening improve adhesion reproducibility. Four techniques were investigated: fine abrasive sandpaper cleaning, acetone degreasing only cleaning an industrial-available alkaline cleaner 5 min 30 min.