Alloy, protecting coating for a component protection against corrosion and oxidation at high temper

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An alloy consists of 26-28 wt.% Co, 20-22 wt.% Cr, 7-9 wt.% Al, 0.5-0.7 wt.% Y and/or at least one equivalent metal chosen from the group comprising Sc and the rare earth elements, 0-2 wt.% Si, 0-11 wt.% Re, and the rest Ni. The alloy has a protective layer (7) which protects it against corrosion and/or oxidation. A ceramic heat-insulating layer is applied to the protective layer.