PROSPECTS FOR REPLACING CHROMIUM-NICKEL ELECTROPLATING COATINGS USED TO PROTECT PARTS NICKEL-MOLYBDENUM OIL EQUIPMENT

TEITCK

Abstract

Statement of the problem the results of research devoted to solving one of the most important problems of metallurgy - protection of oil equipment from corrosion and wear using electroplating coatings are presented. Galvanic coatings of elements of submersible pumps with chromium-nickel alloys are considered, and their replacement with nickel-molybdenum alloys is proposed

Methods used: samples were made from submersible pump parts and control samples with electrolytic nickel-molybdenum coatings. To obtain coatings, a laboratory setup was used; deposition was carried out from sulfuric acid electrolytes. Visual inspection of submersible pump parts was carried out, the chemical composition of coatings, microhardness, porosity, roughness and adhesion strength were determined. The corrosion rate was determined by the gravimetric method. The structural features were studied using optical and electron microscopy.

Novelty: a comparative analysis of traditionally used chromium-nickel coatings with nickel-molybdenum coatings was carried out. Coatings with improved characteristics have been proposed. Practical significance: optimal modes for producing nickel-molybdenum coatings to replace toxic chromium-containing coatings have been proposed.

Result: it was established that the cause of premature failure was corrosion ulcers due to insufficient density of coatings on the cylinder part, as well as a violation of the geometry of the plunger-type part due to impaired machining technology. Comparing previously obtained results, as well as conducting additional research, it was established that nickel-molybdenum coatings containing 12.5% or more Mo can be used as protection for plunger pump parts from corrosion damage.