Selective removal of brazing compound from joined assemblies
AssigneeUnited Technologies Corporation
InventorsMark Jaworowski, Michael A Kryzman
Life of this patent
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Abstract
A process for selective removal of a nickel alloy brazing composition from a nickel-base alloy component includes the steps of providing a brazed assembly including nickel-base alloy components joined by nickel alloy brazing composition; immersing the assembly in an electrolyte; and applying a potential across the electrolyte at a magnitude wherein the nickel-base alloy components are electrochemically passive and the nickel alloy brazing composition dissolves whereby the brazing composition is removed from the components.
Claims11
A process for selective removal of a nickel alloy brazing composition from a nickel-base alloy component, comprising the steps of:
- providing a brazed assembly comprising nickel-base alloy components joined by nickel alloy brazing composition, wherein said nickel-base alloy components are provided from a material having a nominal composition as follows:
- C Mn Si S Cr Co Nb + Ta Min — — — — 14.0 — 0.70 Max 0.80 1.00 0.50 0.01 17.0 1.0 1.20 Ni Cu Ti Al Fe — Min 0.70 — 2.25 0.40 5.0 % Max — 0.50 2.75 1.00 9.0 %
- immersing said assembly in an electrolyte;
- and
- applying a potential across said electrolyte at a magnitude wherein said nickel-base alloy components are electrochemically passive and said nickel alloy brazing composition dissolves whereby said brazing composition is removed from said components.
A process for selective removal of a nickel alloy brazing composition from a nickel-base alloy component, comprising the steps of:
- providing a brazed assembly comprising nickel-base alloy components joined by nickel alloy brazing composition;
- immersing said assembly in an electrolyte;
- and
- applying a potential across said electrolyte at a magnitude wherein said nickel-base alloy components are electrochemically passive and said nickel alloy brazing composition dissolves whereby said brazing composition is removed from said components, wherein said potential is greater than 0.0 and up to about 1.0 volts versus a Ag/AgCl reference electrode.
A process for selective removal of a nickel alloy brazing composition from a nickel-base alloy component, comprising the steps of:
- providing a brazed assembly comprising nickel-base alloy components joined by nickel alloy brazing composition;
- immersing said assembly in an electrolyte, wherein the electrolyte consists essentially of a solution of one mineral acid selected from the group consisting of HCI and HNO3;
- and
- applying a potential across said electrolyte at a magnitude wherein said nickel-base alloy components are electrochemically passive and said nickel alloy brazing composition dissolves whereby said brazing composition is removed from said components.
Dependencies are inferred from the claim text.