Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1994-08-23
1996-05-28
Simmons, David A.
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148287, 420 34, 420104, 4284721, 4284722, C23C 810
Patent
active
055207510
ABSTRACT:
The present invention is a process for forming protective films on an alloy substrate by: oxidizing an alloy comprising iron and chromium in an oxygen containing atmosphere, said alloy containing from about 5 to about 15 wt % chromium, at a temperature of from about 200.degree. C. (473.degree. K.) to about 1400.degree. C. (1673.degree. K.), more preferably 300.degree. C. (573.degree. K.) to 600.degree. C. (873.degree. K.) wherein the partial pressure of oxygen in said oxygen containing atmosphere is above or equal to the dissociation pressure of Fe.sub.3 O.sub.4 and FeO below or equal to the dissociation pressure of Fe.sub.2 O.sub.3 within the specified temperature range, and for a time sufficient to effect the formation of a film comprising iron-chromium oxide (FeCr.sub.2 O.sub.4) spinel on the surface of said alloy. In a further embodiment, the film may additionally contain Silicon.
REFERENCES:
patent: 3704333 (1972-11-01), Spangler et al.
patent: 4168184 (1979-09-01), Hultquist et al.
patent: 4297150 (1981-10-01), Foster et al.
"The Effect of Preoxidation of Some Ni, Fe and Co-Base Alloys on Subsequent Sulfidation at 982.degree. C. in Sulfur Vapor," Oxidation of Metals, vol. 30, Nos. 5/6, 1988, Sheybany & Douglass, pp. 433-463.
Mumford James D.
Ozekcin Adnan
Pareek Vinod K.
Ramanarayanan Trikur A.
Bakun Estelle C.
Exxon Research and Engineering Company
Koehler Robert R.
Simmons David A.
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