General Electric Company

David Carr

Lawrence Bernard Kool

William Randall Thompson

Richard DiDomizio

Anatoli Kogan

Brian Stephen Noel

Stephen Francis Rutkowski

Paul Steven Svec

Michael Francis Gigliotti, Jr

Kenneth Burrell Potter

Michael Francis X Gigliotti, Jr

Kiyokazu Watanabe

Minoru Ishida

Kazuharu Hattori

Jr Michael Francis X Gigliotti

A slurry coating composition is described, which is very useful for enriching the surface region of a metal-based substrate with aluminum. The composition includes colloidal silica and particles of an aluminum-based powder, and is substantially free of hexavalent chromium. The slurry may include colloidal silica and an alloy of aluminum and silicon. Alternatively, the slurry includes colloidal silica, aluminum or aluminum-silicon, and an organic stabilizer such as glycerol. The slurry exhibits good thermal and chemical stability for extended periods of time, making it very useful for industrial applications. Related methods and articles are also described.

Aluminizing slurry compositions free of hexavalent chromium, and related methods and articles

An organic coating composition is described, which can be used to enrich the surface region of a metal-based substrate with aluminum. The composition comprises an aluminum-based powder and at least one organic resin, e.g., alkyds, epoxies, or silicone materials. At least some of the aluminum-based powder is in the form of substantially spherical powder particles. The coating composition is substantially free of hexavalent chromium. It can be applied to the substrate by a variety of techniques, such as spraying. It is then heat-treated, to cause diffusion of aluminum into the surface region of the substrate, e.g., a turbine engine component. The composition exhibits good thermal and chemical stability for extended periods of time. Related articles are also described.

Organic coating compositions for aluminizing metal substrates, and related methods and articles

A method for removing a chromide coating from the surface of a substrate is described. The coating is treated with a composition which includes an acid having the formula HAF, where 'A' can be Si, Ge, Ti, Zr, Al, or Ga; and x is 1&#x2013;6. An exemplary acid is hexafluorosilicic acid. The composition may also include a second acid, such as phosphoric acid or nitric acid. In some instances, a third acid is employed, such as hydrochloric acid. A related repair method for replacing a worn or damaged chromide coating is described. The coating is often applied to portions of turbine engine components made from superalloy materials.

Process for removing chromide coatings from metal substrates, and related compositions

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Taylor, SC, United States of America

David Carr