The process of thermodiffusion boronizing of the surfaces of the samples made of high strength corrosion-resistant nickel and copper-doped “Ni-Resist” cast iron in the borate melt was studied. The dependence of boride coating thickness on temperature and exposure time was determined. The boride coating was applied on the sample parts of oil pump made of “Ni-Resist” cast iron using the determined optimal boronizing regime. The samples corrosion resistance and wear- resistance to the abrasive wear under real pump operation conditions was experimentally tested. The wear-resistance increased by 5–6 times.