Influence of substituents in bis(2-amino-5-R-phenyl)disulfide on the deposition processes and properties of nickel-phosphorus coatings

• V.A. Polikarchuk, M.S. Derkachev, N.V. Sotskaya, N.S. Buylov and Kh.S. Shikhaliev

Voronezh State University, 1 Universitetskaya pl., 394018 Voronezh, Russian Federation

Abstract: The research explored the effect of bis(2-aminophenyl)disulfide and their derivatives on the electroless nickel plating process and the characteristics of Ni–P coatings with corrosion-resistant properties. A method for synthesizing bis(2-amino-5-R-phenyl)disulfides with R substituents (H, CH₃, CH₃O, F, Cl, COOH, SO₃Na) at the 5th position from readily available materials was outlined. It was shown that all additives exhibit inhibitory effects on the bulk solution reaction, intensifying with higher concentrations. The additives exhibit both catalytic and inhibitory properties during the deposition of Ni–P coatings. An optimal range of additive concentrations (1·10^–5–3.16·10^–5 mol/L) was chosen to enhance coating deposition rates and solution stability. The effect of the substituent in additives becomes more evident during the coating formation, triggering modifications in composition, structure, and morphology. As additive concentrations rise, most substituents in them lead to decreased phosphorus content in the coating, except for R (CH₃ and SO₃Na). Comparatively weak reflections from the Ni(200) plane are noticeable in the X-ray diffraction patterns of coated surfaces, hinting at enhanced crystallinity in the deposit. The noteworthy effect of substituents at the 5th position of bis(2-amino-5-R-phenyl) disulfides is reflected in alterations in the morphology of the coatings. Depending on the concentration and substituents in the benzene ring, coatings appear either smoother for R (CH₃O, COOH, and SO₃Na) relative to additives absence, or exhibit a more developed surface for R (H, F, Cl).

Keywords: Ni–P coating, electroless nickel deposition, stabilizers, accelerators, disulfides, bis(2-amino-5-R-phenyl)disulfides

Int. J. Corros. Scale Inhib., 2024, 13, no. 3, 1437-1457
doi: 10.17675/2305-6894-2024-13-3-5

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