Structural features of composite electrochemical coatings nickel – diamond

The paper studies the structure of nickel-diamond composite electrochemical coatings obtained from the suspension electrolyte with ASM 7/5 powder. When the content of diamond powder in the electrolyte is 10 g/l, coatings are deposited with a uniform distribution of the reinforcing phase and a diamond volume fraction of up to 20%. Studies of the structure of the nickel coating matrix have revealed that, in comparison with standard galvanic nickel, which has a pronounced texture, the composite coating matrix has a finely dispersed structure with random grain orientation. Comparative measurements of nanohardness made it possible to record the strengthening of composite coatings matrix compared to galvanic nickel. Along with the high hardness of the reinforcing component and the relatively large particle size, this determines the high microhardness of the composite coating, which averages 860 HV.