Study of corrosion resistance and wear behavior of sol gel coating on AA7075

Ezuddin, Muhammad Harith (2015) Study of corrosion resistance and wear behavior of sol gel coating on AA7075. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of this research is to study the wear behaviour and corrosion resistance of sol-gel coating on aluminium alloy 7075. AA7075 is widely used for aircraft manufacturing due to its low density to weight ratio and high strength. As this aluminium operates in aggressive environments in atmospheric air, the aluminium must be coated to prevent corrosion. However, the commonly used chromating technique become concern because it is hazardous and even carcinogenic. The sol gel coating become subject of interest to protect the AA7075 due to its chemical inertness and have been proven for excellent chemical resistance. The coated sample analysed by XRF confirmed the presence of silica as the coating layer. Samples observed under SEM shows the presence of crack on the coatings. The sol gel coating shows corrosion protection at certain TEOS concentration whereas the results from wear study shows a pattern of performance as the TEOS concentration changes.

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