Dynamic Fluoride Ion Cleaning as a Pre-Braze Process

In the turbine airfoil refurbishment business, brazing cracks in investment cast parts made of expensive alloys is routinely required as hot section jet engine components are damaged due to oxidation, sulfidation, hot corrosion, fatigue, or foreign object damage. However proper brazing requires that all oxidation first be thoroughly removed from airfoil component surfaces, cooling passages and cracks, which can be very narrow and deep.