Hard anodize of cold spray aluminum layer

Abstract

A process for repairing components includes the steps of providing a component having an affected area on a surface of a component to be repaired; depositing a repair material over the affected area on the surface of the component so that the repair material plastically deforms without melting and bonds to the affected area upon impact with the affected area and thereby covers the affected area; providing a sulfuric acid based anodizing solution; anodizing a deposited repair material on the surface of said component in the sulfuric acid based anodizing solution; consuming only a portion of the deposited repair material to form a hard anodized coating layer upon the deposited repair material to form a hard anodized coated component; providing a corrosion resistant sealant solution; and contacting a hard anodized coated component with the corrosion resistant sealant solution to form a corrosion resistant sealant coating on the hard anodized coated component.

Description

FIELD OF THE DISCLOSURE[0001]The invention relates to the field of repairing gas turbine components that have experienced corrosion damage and, more particularly, relates to methods that extend component life by reducing or eliminating further corrosion damage which could cause the component to be scrapped.BACKGROUND OF THE DISCLOSURE[0002]Gas turbine engine components, such as fan cases, bleed valves, bleed ducts, clamps, nacelle v-grooves, nacelle track sliders, gearboxes, and the like, are typically constructed of aluminum and magnesium alloys. Aluminum alloys such as AA 6061 and AA 2024 are soft and suffer damage via general wear, fretting against steel components, impact, etc. One method of mitigating wear of aluminum alloys is anodic conversion of the alloy to produce a hard oxide layer on the exposed surface per processes such as AMS 2468 or AMS 2469. There exist many means to dimensionally restore aluminum alloys; however, wear resistance is inferior to these hard anodic coa...

AI Technical Summary

Problems solved by technology

Aluminum alloys such as AA 6061 and AA 2024 are soft and suffer damage via general wear, fretting against steel components, impact, etc.

There exist many means to dimensionally restore aluminum alloys; however, wear resistance is inferior to these hard anodic coatings.

Aluminum alloys are susceptible to general corrosion and especially salt (halide) environments and galvanic corrosion during regular service in the field.

And, magnesium alloys, being typically less noble than aluminum alloys, are actually more susceptible to galvanic corrosion.

For example, corrosion damage can be caused from electrical contact with a more noble alloy or by electrolytes in the presence of water or moisture.

There exists a drawback to hard anodizing processes.

Hard anodizing processes consume part of the components' surface.

Magnesium alloys can be hard anodized, but the processes are substantially more difficult and expensive.

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