Selective removal of nickel-based braze alloy from nickel-based metals

摘要

Nickel-based braze alloys can be removed from nickel-based metals without damaging the nickel-based metal by a process comprising immersing the nickel-based braze alloy/nickel-based metal composite into an electrolyte solution which will not attack the nickel-based metal at a specified voltage condition. This voltage condition is imposed across the composite and potentiostatically controlled to produce a nickel braze alloy/nickel-based metal current density ratio in the composite which results in etching of the nickel-based braze alloy with no damage to the nickel-based metal. The process has particular utility for removing nickel-based alloy brazed vanes from nickel-based metal shrouds in gas turbine engine stators.