Corrosion and abrasion resistant coating
AssigneeROLLS-ROYCE plc
InventorsTetyana P. Shmyreva, Brad F. Wiley, Gabrielle M. Casey
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Abstract
A gearbox adapted for use with a gas turbine engine and a method for making the same are disclosed herein. The gearbox comprising a housing made from a magnesium alloy, and an aluminum oxide coating on the magnesium alloy housing. The aluminum oxide coating may inhibit corrosion of the housing, and may have a nano-microcrystalline structure that defines an inner region bonded directly to the housing and an outer region spaced apart from the housing.
Claims20
A gearbox adapted for use with a gas turbine engine, the gearbox comprising
- a magnesium alloy housing, and
- an aluminum oxide coating on the magnesium alloy housing to inhibit corrosion and abrasion of the housing, the aluminum oxide coating having a nano-microcrystalline structure, and the aluminum oxide coating comprising an inner region bonded directly to the housing and an outer region spaced apart from the housing,
- wherein the outer region has an outer porosity, the inner region has an inner porosity, and the inner porosity is less than the outer porosity.
A component for a gas turbine engine, the component comprising
- a magnesium alloy, and
- an aluminum oxide coating having a nano-microcrystalline structure that defines an inner region bonded to the magnesium alloy and an outer region spaced apart from the magnesium alloy,
- wherein the outer region has an outer porosity, the inner region has an inner porosity, and the inner porosity is less than the outer porosity.
A method for coating a magnesium component, the method comprising
- applying an aluminum layer to the magnesium component,
- oxidizing the aluminum layer to create an aluminum oxide layer, and
- adding a protective layer to the aluminum oxide layer.
Dependencies are inferred from the claim text.