Coating of a discrete selective surface of an article

摘要

A method for restoring or enhancing an environmental resistant coating (22) of a coating total thickness within a coating design thickness range on a metal substrate (20) of an article (10) includes the application of a restoring or enhancing metal (30) to at least one discrete local surface area. Then at least the discrete local surface area is coated with an environmental resistant coating (32). For use of the method to restore a coating (22) on an article (10) which has experienced service operation and the discrete surface area (28,29) includes an undesirable amount of oxidation/ corrosion products, the oxidation/corrosion products first are removed from an outer portion (24) of the coating (22) while retaining a coating (22) present at the discrete surface areas and retaining the entire coating (22) on surface areas adjacent the discrete surface areas. Then the restoration metal (30) is applied. For use of the method to enhance an existing coating (22), at least one discrete surface area is selected based on an oxidation/corrosion attack pattern (16,18) identified from similar articles (10) which experienced service operation in apparatus of a design for which the article (10) is intended. Then the enhancing metal (30) is applied to the selected area.