Abstract
The article presents the results of kinetic investigates of electrodeposition of a composite electrochemical coating based on a nickel-boron alloy. Current efficiency, polarization potentiodynamic researches had shown the joint participation in the electrodeposition process of finely dispersed compounds of nickel hydroxides, poorly soluble nickel and boron compounds present in the electrolyte or formed during electrolysis, and ultradispersed diamond introduced into the electrolyte. Comparison of 2D and 3D scans of the surfaces of the formed coatings confirmed the leveling effect of additives, as well as sparingly soluble nickel and boron compounds on the structure of coatings. The proposed composite electrochemical coatings can be used instead of chrome coatings when restoring parts and units of agricultural machinery.
Highlights
In order to increase the level of reliability and service life of modern agricultural machinery, it is promising to use galvanic coatings with nickel, nickel-based alloys (nickelphosphorus, nickel-boron (Ni-B)), as well as composite electrochemical coatings (CEC) based on nickel for the restoration of parts and assemblies of agricultural machinery. and its alloys
A current efficiency of more than 100% is the most important characteristic of electrolytes containing fine particles involved in electrode processes [7]
We explain the results of these studies by the inclusion in the cathode deposit of fine particles introduced into the electrolyte, as well as the inclusion of both non-decomposed colloidal nickel compounds and poorly soluble nickel and boron compounds
Summary
In order to increase the level of reliability and service life of modern agricultural machinery, it is promising to use galvanic coatings with nickel, nickel-based alloys (nickelphosphorus, nickel-boron (Ni-B)), as well as composite electrochemical coatings (CEC) based on nickel for the restoration of parts and assemblies of agricultural machinery. and its alloys. In order to increase the level of reliability and service life of modern agricultural machinery, it is promising to use galvanic coatings with nickel, nickel-based alloys (nickelphosphorus, nickel-boron (Ni-B)), as well as composite electrochemical coatings (CEC) based on nickel for the restoration of parts and assemblies of agricultural machinery. The advantage of these precipitates is the method of their deposition from non-toxic electrolyte-colloids or electrolyte-suspensions in comparison with environmentally hazardous processes, such as chromium plating. Environmental problems are the subject of discussion, including at the legislative level, and on galvanic lines, this prohibition primarily concerns the processes of "hexavalent" chromium plating, which contributes to the development of alternative methods of applying protective coatings [2, 3]. Ni-B electrolytic alloys are known for their improved physical, mechanical and electrical characteristics, which makes it possible to use them instead of chrome and precious metal coatings
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