Method for removing at least one partial area of a component made of metal or a metallic compound

Abstract

The invention relates to a method for removing at least one layer area of a component made of metal or a metal compound. When components are used in high temperature areas, they acquire degraded areas which are removed by means of an acid attack. Removal during said acid treatment is uneven since areas having different acidic solubility behavior arise as a result of said degradation. According to the inventive method, the chemical composition and the phase composition of the component can be altered in such a matter that an even removal can take place during the acid treatment.

1 - 12 . (canceled)  
     
     
         13 . A method for removing a partial layer area of a component, comprising: 
 removing the partial area by an acid treatment or a mechanical treatment;    diffusing a diffusion agent comprised of a first element and a second element into the partial area of the component; and    diffusing the first or second element of the diffusion agent into the component directly from a gas phase.    
     
     
         14 . The method as claimed in  claim 13 , wherein the component is comprised of a metal and a metal compound.  
     
     
         15 . The method as claimed in  claim 13 , wherein the component is comprised of a metal or a metal compound.  
     
     
         16 . The method as claimed in  claim 13 , wherein the second element of the diffusion agent is metallic.  
     
     
         17 . The method as claimed in  claim 13 , wherein the first or second element of the diffusion agent is aluminum.  
     
     
         18 . The method as claimed in  claim 13 , wherein the first or second element of the diffusion agent is cobalt.  
     
     
         19 . The method as claimed in  claim 13 , wherein the first element of the diffusion agent is aluminum and the second element of the diffusion agent is cobalt.  
     
     
         20 . The method as claimed in  claim 13 , wherein the diffusion agent is applied to a surface of the component.  
     
     
         21 . The method as claimed in  claim 20 , wherein the diffusion agent is applied by plasma spraying.  
     
     
         22 . The method as claimed in  claim 20 , wherein the diffusion agent is applied by evaporation coating.  
     
     
         23 . The method as claimed in  claim 20 , wherein the diffusion agent is applied by chemical vapor deposition.  
     
     
         24 . The method as claimed in  claim 20 , wherein the diffusion agent is applied by a pack method.  
     
     
         25 . The method as claimed in  claim 13 , wherein the diffusion causes a phase change in the component or partial area.  
     
     
         26 . The method as claimed in  claim 13 , wherein the partial area is an MCrAlY layer where M is an element iron, cobalt or nickel.  
     
     
         27 . A method for removing a partial area of a component having a metal compound layer, comprising: 
 removing the partial area by an acid treatment or a mechanical treatment, a diffusion agent comprising two components diffusing into the partial area of the metal compound layer, and two components of the diffusion agent are metallic, and one component of the diffusion agent diffuses into the component directly from a gas phase.