Hot corrosion-resistant coatings and components protected therewith

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A coating system (14, 34) on a superalloy or silicon-containing substrate (12, 32) of an article (10, 30) exposed to high temperatures. The coating system (14, 34) includes a coating layer (16, 18, 20, 22, 24, 36, 38) that overlies the substrate (12, 32) and is susceptible to hot corrosion promoted by molten salt impurities. A corrosion barrier coating (26) overlies the coating layer (16, 18, 20, 22, 24, 36, 38) and contains at least one rare-earth oxide-containing compound that reacts with the molten salt impurities to form a dense, protective byproduct barrier layer (28).