Hybrid sealing for anodized metal

Abstract

Disclosed is a method of providing corrosion protection to an anodized metal including providing a metal having an anodization layer wherein the anodization layer includes a barrier portion; contacting the anodization layer with a first solution at a first temperature to seal the barrier portion; and contacting the anodization layer with the sealed barrier portion with a second solution at a second temperature to deposit a precipitated rare earth compound in the anodization layer with the sealed barrier portion; wherein the first solution includes a transition metal oxyanion and has a pH of 3 to 6 and the second solution includes a trivalent rare earth cation.

What is claimed is: 
     
         1 . A component of a gas turbine engine comprising an anodized metal wherein the anodized metal comprises an anodization layer having a sealed barrier portion and a precipitated rare earth compound disposed in the anodization layer. 
     
     
         2 . The component of  claim 1 , wherein the anodized metal comprises aluminum or an aluminum alloy. 
     
     
         3 . The component of  claim 1 , wherein the rare earth compound comprises a metal hydroxide wherein the metal is La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y, or Sc. 
     
     
         4 . The component of  claim 1 , wherein the component is a stator vane. 
     
     
         5 . The component of  claim 1 , wherein the component is a fan case. 
     
     
         6 . The component of  claim 1 , wherein the component is a shroud for the gas turbine engine.