The structural state and the tribological properties of electrochemical Co-P coatings with a con centration of phosphorus of 1.5-20 at % have been studied. It has been found that, in the Co-P coatings with phosphorus concentrations of less than 8 at %, a solid solution is formed of phosphorus in the matrix α Co phase. The Co 92 P 8 coating has an amorphous crystalline structure. At phosphorus concentrations of ≥10 at %, coatings with an amorphous structure are formed. The mechanism of the formation of the structure during the deposition of coatings with various concentrations of phosphorus has been discussed. It has been shown that the best tribological properties are characteristic of the crystalline Co-P coatings with a phosphorus con centration of 3 at % and of the amorphous coatings with a phosphorus concentration of 20 at %. The conclu sion has been drawn that the wear resistance of the amorphous Co-P coatings is determined by the deforma tion thermal stability of their amorphous structure.

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