Application of Composite Electroless Nickel Coatings on Precision Parts of Hydraulics Aggregates

The article presents the results of the investigations on the development of new method of hardening and reconditioning of resource-determining parts of hydraulics aggregates of various purpose machinery by composite electroless nickel coatings. It is proved, that by obtaining the composite chemical coatings the most efficient are nanodispersed particles of aluminum oxide and potassium polytitanate. The tribological testing testified, that the wear of the samples which were deposited with the nickel based composite coating, is 1.4 times less than the wear of the samples with the base nickel coating. The bench testing determined that in spool and sleeves of the hydraulic distributors hardened by the composite electroless nickel deposition, leakage value is 1.4 times less than in commercial ones, and 1.3 times less compared with the pairs being reconditioned by ironing.