Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1996-06-17
1998-03-17
Marschel, Ardin H.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 11, 134 19, 134 31, 134 37, C03C 2300, B08B 500, B08B 700, B08B 704
Patent
active
057282277
ABSTRACT:
A method for removing a diffusion coating which includes Al from a Ni base alloy surface portion comprises mechanically removing substantially a coating outer portion disposed on a coating diffused inner portion, and then depleting Al from the exposed diffused inner portion. Such depletion is by exposing the inner portion to a reducing gas comprising greater than about 6 wt. % halogen gas, for example a mixture of up to about 20 wt. % of a hydrohalogen gas, such as hydrogen fluoride gas, with the balance principally hydrogen gas. The temperature of exposure is at least about 1600.degree. F., preferably about 1600.degree.-2000.degree. F. for about 2-10 hours.
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General Electric Company
Hess Andrew C.
Marschel Ardin H.
Narciso David L.
Riley Jezia
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