METHOD OF REMOVING HOT CORROSION PRODUCTS FROM A DIFFUSION ALUMINIDE COATING

摘要

A method of removing hot corrosion products from the surfaceof a component exposed to corrosive conditions at elevated temperatures, asis the case with turbine, combustor or augmentor components of gas turbineengines. The method is particularly suited for the removal of hot corrosionproducts from components protected with a diffusion aluminide coating,either as an environmental coating or as a bond coat for a thermal barriercoating (TBC). The processing steps of the method include immersing thecomponent in a heated liquid solution containing acetic acid, and thenagitating the surfaces of the component while the component remainsimmersed in the solution. In this manner, hot corrosion products on thesurfaces of the component are removed without damaging or removing thediffusion aluminide coating. As a result, regions of the component fromwhich the hot corrosion products were removed can then be repaired by asuitable aluminizing process.