C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 2/14 (2006.01) C23C 2/24 (2006.01) C25F 5/00 (2006.01) C25F 7/00 (2006.01)
Patent
CA 2444171
An electrochemical process for selectively stripping at least one coating from the surface of a substrate is disclosed. The substrate (6) (often a turbine engine component) is immersed in a composition (3) through which electrical current flows. The composition (3) includes a halide salt, such as sodium chloride, ammonium chloride, and potassium chloride. In preferred embodiments, the electrical current is direct current (dc). The process is especially useful for selectively removing portions of diffusion aluminide coatings. For example, the additive layer (74) can efficiently be removed, without substantially affecting the underlying diffusion layer (72) or substrate (70). Related stripping compositions and apparatuses are also described.
On présente une méthode électrochimique d'enlèvement sélectif d'au moins un revêtement de la surface d'un substrat. Le substrat (6) (souvent un composant de moteur à turbine) est immergé dans une composition (3) à travers laquelle passe un courant électrique. La composition (3) comprend un sel halogéné, tel que le chlorure de sodium, le chlorure d'ammonium et le chlorure de potassium. Dans des modes de réalisation préférés, le courant électrique est un courant continu (cc). La méthode est particulièrement utile pour retirer sélectivement des parties de revêtements d'aluminure par diffusion. Par exemple, on peut enlever efficacement la couche d'additif (74), sans trop influer sur la couche de diffusion sous-jacente (72) ou le substrat (70). On décrit également des compositions décapantes et appareils connexes.
Colaizzi Tris
Ferrigno Stephen J.
Grossklaus Warren D.
Lagraff John R.
Macdonald Leo S.
Company General Electric
Craig Wilson And Company
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