Potassium hydroxide stripping

Potassium hydroxide stripping

MTU's repair specialists have developed a new process where the component is im-mersed in a molten salt bath (potassium hydroxide). This salt bath attacks and dissolves the so-called TGO (thermally grown oxide) layer between the thermal barrier coating and the corrosion-protection coating. The thermal barrier coating no longer adheres to the component and can easily be removed. The process is suitable for all thermal barrier coatings applied by the EB-PVD process regardless of the condition of the coating on engine-run components. It removes coatings reliably and completely without attacking the base material or the corrosion-protection coating. It is mainly used for high-pressure turbine blades and is an alternative to high-pressure water-jet stripping of thermal barrier coatings.