FE-NI-P galvanic coatings for restoration of worrn parts of agricultural machinery and technological equipment

Introduction. By analyzing the electrodeposited Fe-Ni-P alloy using electron microscope scanning and X-ray analysis, its unusual structure, including micro and morphological features, becomes apparent. This alloy, produced from a sulphate electrolyte using asymmetric alternating current, is a complex system with the presence of α-Fe and β-Ni phases, as well as phosphorus integrated into FeαNi and a FeSO₄ phase resulting from electrolysis under dynamic conditions. The use of heat treatment causes the appearance of additional phases such as Ni₃P and Fe₃P. A notable characteristic of this alloy is its unique amorphous-nanocrystalline structure. Enhancing the performance of Fe-Ni-P alloy shells is the integration of phosphorus, which makes them twice strong and three times more corrosion resistant than traditional Fe-Ni shells. Also, heat treatment of these shells leads to an increase in their resistance to corrosion and microhardness due to the creation of intermetallic phases. It has been observed that plows treated in this way are distinguished by 1.5-2.2 times improved resistance to abrasion and corrosion compared to sormite products, achieving results similar to composite shells. Research shows a significant reduction in wear on the inside of grain pipelines after they are treated with an alloy based on iron, nickel and phosphorus. In particular, after moving 25,000 tons of grain, grain pipelines restored with this alloy demonstrate approximately 2.4-3.1 times lower levels of wear compared to analogues made from conventional sheet steel.
Object. The object of the study is the study of galvanic coatings of the Fe-Ni-P type.
Results and conclusion. The use of cathode current with variable asymmetry, where the current density ranges from 5 to 30 A/dm2 and the asymmetry coefficient ranges from 8 to 12, leads to the formation of surfaces with uniform structures. These structures are characterized by the presence of both amorphous and crystalline particles, creating patterns that are similar in appearance to spheres and droplets. They contain phases of compounds such as Ni₃P and Fe₃P, and also contain elements such as α-Fe, β-Ni, and phosphorus, which are incorporated into FeαNi solid solutions.

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