or erosion compressor blades are therefore provided as a rule with coatings in this case in particular coatings 16 are considered which comprise a for example phosphate bound basic matrix with metal particles such as for example aluminum particles distributed dispersively therein in the protective action of a coating of this type the metal particles embedded in the basic coating form together with the nobler metal of the compressor blade and the electrolyte a galvanic cell in which the metal particles form what are known as sacrificial anodes the oxidation or corrosion then takes place in the sacrificial anodes that is to say in the metal particles not in the metal of the compressor blade the phosphate bound basic matrix of the coating has glass ceramic properties is thermally stable and likewise corrosion resistant and protects against mechanical actions for example abrasion and erosion in addition to the metal particles the coating may contain further particles as fillers colorant particles may be mentioned at this juncture as an example in addition to phosphate bound coatings further types of coatings 16 may be considered ep 0 142 418 b1 ep 0 905 279 a1 and ep 0 995 816 a1 describe coatings based on chromate phosphate ep 1 096 040 a2 describes a phosphate borate based coating 16 and ep 0 933 446 b1 describes a phosphate permanganate based coating these layers too may have a matrix according to the invention the particles 1 can be applied together by means of virtually any coating method that is to say by means of thermal.