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Coating and Corrosion Protection
ArticleName Light-absorbing nickel-containing coatings for structural steels
DOI 10.17580/chm.2023.08.07
ArticleAuthor A. A. Abrashov, Ya. V. Tolmachev, N. S. Grigoryan, T. A. Chudnova.

Mendeleev University of Chemical Technology of Russia, Moscow, Russia:

A. A. Abrashov, Cand. Eng., Associate Prof., Dept. of Innovative Materials and Corrosion Protection, e-mail:
Ya. V. Tolmachev, Postgraduate Student of the Dept. of Innovative Materials and Corrosion Protection, e-mail:
N. S. Grigoryan, Cand. Chem., Associate Prof., Prof., Dept. of Innovative Materials and Corrosion Protection, e-mail:
T. A. Chudnova, Cand. Eng., Associate Prof., Dept. of Innovative Materials and Corrosion Protection, e-mail:


A technology for the deposition of black nickel-based coatings with high protective ability, adhesion strength and wear resistance for 50A and 50RA, 09G2S, Steel 20, Steel 30, 08X17 steel grades has been developed. Sulfate nickel plating electrolyte with the following parameters was chosen as the base solution, g/L: 100 – NiSO4·7H2O; 40 – ZnSO7H2O; 25 – H3BO3; 15 – (NH4)2SO4; 7 – NaH2PO2; pH = 4.5–5.5, temperature 50–55 °C. It has been experimentally established that good quality coatings are deposited from the solution with sodium hypophosphite concentration of 5–10 g/L. A two-stage current mode has been selected that makes the formation of black coatings possible: stage I – during the first 10 minutes of the process, the current density gradually rises from i1 = 0.02 A/dm2 to i2 = 0.2 A/dm2, stage II – a sharp increase in current density up to i3 = 1.5 A/dm2, with the electrolysis continuing for another 10 minutes. It was shown that the average thickness of the coating deposited from the solution at a constant current density is 6 μm, whereas coatings with a thickness of 10 μm are formed during the stepwise deposition. Wherein, the electrolyte in the first case has a positive leveling, while in the second case the leveling is negative. It was determined that the coating consists of nickel oxides NiO, Ni2O3, zinc oxide ZnO, nickel phosphide Ni2P, as well as nickel hydroxide Ni(OH)2 and zinc hydroxide Zn(OH)2. It was determined that the black nickel-based coatings obtained are not only not inferior, but are superior to black chromium coatings in terms of wear resistance and protective ability.
The researches were carried out using D. Mendeleev Center for collective use of scientific equipment, within the framework of the project No. 075-15-2021-688.

keywords Light-absorbing coatings, black nickel-based coatings, electrodeposition of metals, nickel plating, "black nickel", wear-resistant coatings

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