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Masking techniques for electrochemical stripping

An electrochemical and functional technology, applied in the direction of electrolytic components, electrolytic process, etc., can solve problems such as grooves on the airfoil part

Inactive Publication Date: 2007-02-28
UNITED TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Some of the protective layers used have resulted in grooves in the part of the airfoil below this shaded area

Method used

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  • Masking techniques for electrochemical stripping
  • Masking techniques for electrochemical stripping
  • Masking techniques for electrochemical stripping

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Embodiment Construction

[0017] As stated above, the present invention relates to a masking technique for electrochemically stripping coatings and / or diffusion layers from turbine engine components such as turbine blades, impellers and airfoil portions of casings. In one embodiment, the protective layer protecting the trailing edge of the airfoil portion comprises a layer of UV-cured protective material and a clip formed of an electrically conductive material arranged on the UV-cured protective layer. The conductive material preferably consists of a titanium-based material. Titanium is a preferred material due to its resistance to attack in the various baths used in the electrochemical stripping technique. The roots of turbine engine components can be masked by dipping a thin coat of paint or applying a varnish to prevent any microscopic erosion or pitting. In another embodiment, the protective layer consists only of clips arranged on the trailing edge of the airfoil.

[0018] The masking technique ...

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Abstract

A maskant for use in an electrochemical stripping operation is provided. The maskant comprises an electrically conductive member, preferably one formed from a titanium based material, placed about a trailing edge of an airfoil portion of a turbine engine component. A method for removing a coating from a turbine engine component is also provided. The method comprises the steps of placing a maskant formed from an electrically conductive material, preferably a titanium based material, adjacent a trailing edge of an airfoil portion of the component, immersing the turbine engine component and the maskant into a bath, and electrochemically stripping the coating from unmasked portions of the turbine engine component.

Description

technical field [0001] The invention relates to an improved technique for shielding airfoils in electrochemical stripping operations. Background technique [0002] It has been found that as a result of the application of electrochemical stripping techniques to remove coatings applied to and / or diffusion layers formed on the airfoil portion, wall thinning of the airfoil portion of the turbine engine component occurs, resulting in reduced wall thickness. Thin is highly undesirable as this can lead to bowing. [0003] For this reason, it is desirable to shield the trailing edges of airfoils used in turbine engine components such as impellers and blades, in order to prevent wall thinning and cooling hole closure due to thin wall bending. Various techniques are currently employed to prevent this phenomenon from occurring by applying a non-conductive trailing edge protection layer. Typically, barrier-type protective layers such as applicator tapes, varnishe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F5/00C25F7/00
CPCY10T29/49229C25F5/00
Inventor C·H·里维B·J·格里菲思
Owner UNITED TECH CORP