Alloy, protective layer and component

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Alloy (I) comprises 18-22 (preferably 19-21) wt.% of chromium, 10-13 (preferably 11-12) wt.% of aluminum, 0.1-0.3 wt.% of yttrium and/or at least an element comprising scandium and rare earths, preferably yttrium, nickel and/or cobalt and optionally 0.1-0.5 wt.% of silicon. Independent claims are included for : (1) a protective layer (7) for protecting a component against corrosion and/or oxidation, preferably at high temperatures, comprising (I) as a single layer; and (2) a component (1), preferably a component of a gas turbine, where a substrate (4) of the component is based on nickel or cobalt, comprising the protective layer provided as a single metallic layer, where a ceramic thermal barrier coating (10) is applied on the protective layer.