Method for developing an enhanced oxide coating on a component f

Details Method for developing an enhanced oxide coating on a component f Method for developing an enhanced oxide coating on a component f

1998-04-07

1999-11-16

Sheehan, John P

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148243, 148253, 427318, 427343, 427444, 422 19, C23C 2282

Patent

active

059850485

ABSTRACT:
A method for creating an oxide coating on the surface of a component formed from austenitic stainless steel or nickel alloy steel is set forth. The component has a naturally formed oxide film at the surface. The naturally formed oxide is enhanced through a process comprising at least two steps. In the first step, the component is heated in the presence of circulating dry air for a first period of time at a temperature of approximately 300 degrees centigrade. In the second step, the component is heated in the presence of static dry air at an elevated pressure for a second period of time at a temperature that is higher than the temperature during the first period. The exterior portion of the enhanced oxide coating is removed with an oxidizing treatment whereby an oxide coating having a high ratio of chromium to iron is exposed at the surface of the stainless steel.

REFERENCES:
patent: 387046 (1888-07-01), Breeneman
patent: 4518440 (1985-05-01), Phillips, Jr.
patent: 4636266 (1987-01-01), Asay
patent: 5139623 (1992-08-01), Ohmi et al.
Miyake et al, "Release Behavior of Metal Ions from Passivated Stainless Steel and Hot Ultra-Pure Water", Feb. 22-23, 1995.
Sato et al, "Deionized Water Heating System with a Passivated Stainless Steel Heater", 12 international symposium on contamination control, Oct. 10-14, 1994.

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