Corrosion Behaviour of Abradable Aluminum Based Coating

Abstract

Abradable coatings are delineated to minimize the leakage gaps between static and twirling parts to ameliorate their efficiency. The present work explored the corrosion potential of abradable aluminium based coating which is used for sealing and clearance control in the compressor of aero engines. The engine surface was coated with aluminium employing thermal plasma spray coating technique, subsequently exposing it to seawater for varied time length. The performance of coating had been analyzed based on its characteristics viz., porosity, adhesion strength, surface roughness and hardness.Phase transformation and interlayer oxide formation characteristics had also been observed during coating. Corrosion resistance potential by micro structural characterization, composition and phase analysis of coating and seawater treated samples had been carried out using scanning electron microscopy, x-ray diffraction and energy dispersive scanning.