The effect of 2-(9-(methoxycarbonyl)-1,6-dioxo-1,3,4,6,7,8-hexahydro-2H-pyrido[1,2-a]pyrazin-7-yl)acetic acid on properties and corrosion resistance of Ni-P coatings

• V.A. Polikarchuk¹, A.A. Chirkunov², N.S. Buylov¹, Ya.Yu. Kulichikhina¹ and Kh.S. Shikhaliev¹

¹ Voronezh State University, Universitetskaya pl. 1, 394018 Voronezh, Russia
² Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31-4, Leninsky prospect, 119071 Moscow, Russia

Abstract: The effect of a new organic compound, a derivative of pyrido[1,2-a]pyrazine (DOPPA), on the chemical deposition of nickel-phosphorus coatings has been studied. Scanning electron microscopy, elemental analysis, and corrosion tests have shown that the additive in the concentration range of
3.16·10^–7–1·10^–3 mol/L has no significant effect on the deposition rate and chemical composition of coatings, but significantly modifies their morphology. It is shown that the optimal concentration of DOPPA 1·10^–6 mol/L provides the formation of a smooth surface and increased corrosion resistance in a neutral chloride-containing environment. An increase in the concentration of the additive leads to the formation of “orange peel” type textures and aggregation of globules, which reduces the protective properties of coatings. The absence of sulfur in the molecular structure of DOPPA explains its selective effect on morphology without changing the kinetic parameters of precipitation. The results demonstrate the promising use of the pyrido[1,2-a]pyrazine derivative as an effective modifier of the structure and properties of Ni-P coatings.

Keywords: Ni–P coating, electroless nickel deposition, additive, 2-(9-(methoxycarbonyl)-1,6-dioxo-1,3,4,6,7,8-hexahydro-2H-pyrido[1,2-a]pyrazin-7-yl)acetic acid (DOPPA)

Int. J. Corros. Scale Inhib., 2025, 14, no. 4, 2397-2409
doi: 10.17675/2305-6894-2025-14-4-36

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