Electrodeposition of Zinc-Nickel Alloy from Alkaline Amine-containing Electrolyte

This work proposes a method for synthesizing an amine-containing compound from polyamine (PA-10) and an oxirane series compound (M-10) capable of forming strong, alkaline-stable complexes with Ni²⁺ ions.

The effect of the ratio of the initial monomers for synthesizing the complexing component of the alkaline electrolyte for the process of electrodeposition of zinc-nickel alloy, as well as the molar ratio of Ni²⁺ and the complexing component (PA-10_M1.5) in the solution on the Ni content in the alloy and the appearance of the resulting coatings was studied.

It was established that the optimal molar ratio of the initial monomers ([PA-10]:[M-10]) for the synthesis of the complexing component of the PA-10_M1.5 electrolyte is 1.5:1, and the most promising from the technological point of view is a solution based on PA-10_M1.5 with a molar ratio of nickel ions to the complexing component in the electrolyte of 1:2.

An alkaline electrolyte has been developed for the electrodeposition of protective coatings with a zinc-nickel alloy containing (g/l): Zn²⁺ – 9; Ni²⁺ – 3.5; NaOH – 112.5; PA-10_M1.5 – 31.3, which allows deposition of zinc-nickel alloy coatings containing 12...14 %_wt. nickel on a steel surface at a cathodic current density of 0.5…5.0 A/dm², t = 22…40 °C and mechanical stirring. The corrosion resistance and protective capacity of the obtained coatings were determined.

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