study on the Corrosion Mechanisms of Aluminium Alloy 6063-T5 when exposed to FeCl_3-laden Droplet Deposits

摘要

Aluminium Alloy 6063 is one of the most common aluminium alloys, and exposure to marineenvironment can result in severe localised corrosion. The attack typically takes place beneathcorrosion products, obscuring the depth and severity of attack. The atmospheric corrosionbehaviour of AA6063 with exposure to sea-water and FeCl_3containing deposits has beeninvestigated using laser surface confocal microscopy and X-ray computed tomography (X-ray CT)analyses. Time-lapse in-situ observations are reported, providing information on the corrosionkinetics and product distributions.Continuous exposure to FeCl_3 on the corrosion products, its formation and growth has beenexplored. The chemistry of the mechanisms involved has been investigated using Ramanspectroscopy, EDX and SEM which help in determining the corrosion pathway.The work reported here aims to study the effect of FeCl_3 on the rate of corrosion product formation,the mechanisms involved and their effect on the structural integrity of AA6063 under atmosphericexposure conditions.