METHOD FOR PRODUCING NICKEL-DIAMOND COATING Russian patent published in 2017 - IPC C23C18/32 C23C18/36 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: method includes preparing a metal surface, preparing a solution with ultra-dispersed diamonds, and depositing the coating. In the method, a water suspension of ultra-dispersed diamonds is used, which is previously subjected to ultrasonic dispersion for 30-60 min, and in the preparation of the solution in distilled water, nickel sulfate, sodium acetate and acetic acid are dissolved, the solution is heated to a temperature of 87-90°C. The water suspension of ultra-dispersed diamonds is introduced into the resulting solution in the amount of 1-5 g/l, the ultrasonic dispersion of the solution is performed for 5 min, then sodium hipofosfit and thiourea are introduced, the ultrasonic dispersion of the solution is performed for 5 min. Then from the resulting solution containing, g/l: nickel sulfate - 20-30, sodium gipofosfit 10-25, sodium acetate - 10-15, acetic acid - 4-6 ml/l, thiourea - 0.001-0.003, ultra-fine diamonds - 1-5, at pH of 4.3-4.8 the coating is chemically precipitated on the prepared metal surface at a temperature of 87-90°C and a deposition rate of 0.15-0.2 mcm/min until the required thickness of the coating is obtained.

EFFECT: simplification of the technology of chemical nickel coating with ultra-dispersed diamonds by eliminating additional operations to maintain a certain size of ultra-dispersed diamond particles during the deposition of the coating, the possibility to obtain coatings with defined composition and properties.

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