The present invention relates to a process for producing a metallic and / or nonmetallic substrate which is protected against
corrosion at least in regions and is, in particular, shiny, which comprises a) provision of a substrate having at least one surface which can be coated at least in regions and b) application of at least one metallic protective layer comprising a first
metal, a first
noble metal or a first
metal alloy and at least one acid, an
oxide,
double oxide, hydrated
oxide, sulphide,
halide,
nitride,
carbide, carbonitride,
boride,
silicide, oxyhalide and / or salt of a second
metal, of a second
noble metal and / or of a second
metal alloy. The invention further relates to a substrate which is protected against
corrosion at least in regions and is, in particular, shiny, which comprises a substrate and at least one metallic protective layer comprising a first metal, a first
noble metal or a first
metal alloy and at least one acid, an
oxide,
double oxide, hydrated oxide, sulphide,
halide,
nitride,
carbide, carbonitride,
boride,
silicide, oxyhalide, in particular oxyfluoride, and / or salt of a second metal, of a second noble metal and / or of a second
metal alloy.