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Process to remove anodize from aluminum aircraft structures

2005

I am seeking a process or materials to remove anodize from the aluminum structural sub-assemblies of an aircraft. The process must be accomplished on the aircraft (the sub-assemblies are too large to remove), and more specifically, in a confined space (aircraft fuel tank).

My company accomplishes aircraft fuel tank maintenance, and this project entails converting an aircraft dry bay into a wetted fuel tank. In order to apply the fuel tank coat, there is a Fluid Resistant Primer that must be removed, and under the Fluid Resistant primer is an anodized structural sub-assembly. I am seeking a process that will remove the anodize and prep the surface for application of the fuel tank coat.

Any input would be greatly appreciated.

Kelly McCarville
aircraft services - San Antonio, Texas

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We remove anodizing pretty much everyday here and we use a sodium hydroxide based etch, which has a proprietary additive from our chemical supplier.
Simple operation of heating the bath to about 150 degrees F and letting it do its job for about 2 mins then rinse. There are several etches available on the market that will remove the anodize this one just happens to be the most convenient for us to use. I imagine you would be able to heat the solution and then pump it into the tank. Then pump it our and refill and drain with water as many times as necessary.

J. Giddings
plating shop - Pennsylvania
2005