Removal of aluminium rich coatings from heat resisting alloys

Details Removal of aluminium rich coatings from heat resisting alloys Removal of aluminium rich coatings from heat resisting alloys

1975-08-04

1977-06-28

Van Horn, Charles E.

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

156664, 156665, 252 792, 252 793, C23F 100, C23G 102

Patent

active

040323595

ABSTRACT:
A solution for removing a diffused aluminium coating from a component made of nickel or cobalt base high temperature alloy, consisting of Nitric Acid 57%, Sulphuric Acid 29% and Water 14%. The solution removes all but traces of nickel or cobalt-rich aluminides and does not attack the substrate material. If said traces have to be removed also, there is used an etching solution consisting of Ferric Chloride Solution 85%, Sulphuric Acid 10% and Hydrofluoric Acid 5%.

REFERENCES:
patent: 3425881 (1969-02-01), Cohn
patent: 3565771 (1971-02-01), Gulla
patent: 3859149 (1975-01-01), Kay

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