C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/02 (2006.01) C23C 28/00 (2006.01) C23F 1/44 (2006.01) C23G 5/00 (2006.01)
Patent
CA 2204812
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° F, preferably about 1600° - 2000° F for about 2 - 10 hours.
Company General Electric
Craig Wilson And Company
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