Self-lubricating electrolytically deposited phosphate coating

A method for producing a phosphating layer comprising stabilized solid lubricant particles at least comprising the steps of:

• a) providing a metallic workpiece;
• b) immersing the metallic workpiece in an aqueous electrolyte solution comprising at least zinc, phosphate ions, solid lubricant particles and hydrocolloids;
• c) passing an electric current through the metallic workpiece to deposit a phosphating layer on the workpiece;
• and
• d) optionally post-treating the electrolytically deposited phosphating layer, wherein the hydrocolloids are selected from the group consisting of polyamines, polyimines and theft quaternary salts, polyvinylpyrrolidones, polyvinylpyridines, collagen, gelatin, chitosan hydrolyzate, keratin hydrolyzate, casein hydrolyzate, amidopectins and their copolymers, and mixtures thereof, and wherein the solid lubricant particles consist of or include a substance which substance is at least one substance selected from the group consisting of metal salts of saturated fatty acids, ammonium salts of saturated fatty acids, molybdenum disulfide (MoS2), hexagonal boron nitride (h-BN), tungsten disulfide (WS2), graphite, oxidized and fluorinated graphite, polytetrafluoroethvlene (PTFE), nylon, polyethylene (PE), polypropylene (PP), polyvinylchloride (PVC), polystyrene (PS), polyethylene terephthalate (PET), polyurethane (PAIR), clay, talc, titanium dioxide (TiO2), mullite, copper sulfide (CuS), lead sulfide (PbS), bismuth (HI) sulfide (Bi2S3), cadmium sulfide (CdS), and mixtures thereof.