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Alloy comprises (in wt.%) : cobalt (24-26, preferably 25), chromium (12-14, preferably 13), aluminum (10-12, preferably 11), scandium or rare earth elements (0.2-0.5, preferably 0.3), preferably yttrium (0.3-3), tantalum (0.5-2) and nickel (remaining amount). Independent claims are also included for : (1) a protective layer for protecting a component (1) against corrosion and/or oxidation at high temperatures, comprising the alloy composition as a single layer; and (2) a component of a gas turbine, comprising a substrate based on nickel or cobalt, the above protective layer, preferably only a metallic protective layer, for protecting against corrosion and oxidation at high temperatures, and a ceramic thermal barrier layer applied on the protective layer.