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Study on Surface Modification of Aluminum Alloys by Silicate-Based Hybrid Coating

Silicate-based hybrid coatings were deposited on aluminum alloy substrates following the methodology of sol-gel procedure and are applying to survey the corrosion protective behavior. The results show that the optimal intact and uniform film can be obtained by preparing with Si:Al mole ratio 48:1 and tempering at 140°C. It was noted that this modified hybrid coating reduced the corrosion current density from 1.532×10-4A/cm2 (bare substrate) to 2.782×10-8 A/cm2 in 3.5 wt. % NaCl solution. The coating represents an excellent stability, especially at higher temperature, therefore could offer a significant protection to 2024 aluminum alloy substrates.