ФАЗОВЫЙ СОСТАВ И МОРФОЛОГИЯ ПОВЕРХНОСТИ Ni,Zn СПЛАВА, ЭЛЕКТРООСАЖДЕННОГО ИЗ СУЛЬФАТНО АММОНИЙНОГО РАСТВОРА

Kaluzhina, S. A.; Protasova, I. V.

doi:10.17308/kcmf.2018.20/481

Cited by 1 publication

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“…As can be observed, the alloy consists of nanocrystals with the size of 40-100 nm. These results are in very good accordance with the AFM data obtained for the Ni-Zn electrodeposited coatings in [21]. It is known that nickel and its alloys are capable of forming hydrides, which leads not only to hydrogen embrittlement of the resulting coatings, affecting their anticorrosion properties, but also to a change in their electrochemical activity.…”

Section: Resultssupporting

confidence: 89%

“…The energy dispersive X-ray technique showed the presence of Zn and Ni in the electrodeposited coating, and the amount of zinc in the coating is four times that of nickel. These data are in a good accordance with the results of a galvanostatic behavior of the electrolytic coating in 2 M NaOH and with XRD analysis [21], which confirmed the presence of nickel and zinc metals, as well as intermetallic phases of NiZn ( 1 -phase) and Ni 5 Zn 21 (-phase) in the coating electrodeposited from ammonia electrolyte.…”

Section: Resultssupporting

confidence: 88%

“…Transmission electron microscopy (LIBRA 120 PLUS, Germany) was used to independently estimate the particle size, crystallographic characteristics, and roughness of the nickel phase in the (Ni-Zn)*/Ni electrode. The analysis of the measurement results was carried out using the Gwyddion software [21]. The microscopic results were obtained on the equipment of the Center for Collective Use of Scientific Equipment at Voronezh State University (http://ckp.vsu.ru).…”

Section: Methodsmentioning

confidence: 99%

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Cathodic behavior of the dealloyed Ni–Zn coating in sodium hydroxide solution

Kaluzhina¹,

Kozaderov²,

Protasova³

2020

Int. J. Corros. Scale Inhib.

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The goal of the paper is to study the electrochemical behavior of the composite (Ni-Zn)*/Ni electrode in 0.1 M sodium hydroxide solution compared with compact nickel. The composite electrode was obtained by alkaline dealloying in 2 M NaOH of Ni-Zn coating preliminarily electrodeposited on Ni substrate from ammonia electrolyte. The morphology of the Ni-Zn coatings before and after modification was studied using scanning electron microscopy. The crystalline structure of the coatings was investigated by transmission electron microscopy, and it was shown that the alloy consists of nanocrystals with size of 40-100 nm. It was shown by voltammetry that the electrochemically active surface area of (Ni-Zn)*/Ni material is four times greater than that of the nickel substrate. The chemical composition of the coatings was determined by X-ray analysis. It was found that before the modification the amount of zinc in the coating is four times that of nickel. The rate of cathodic hydrogen evolution reaction on the dealloyed Ni-Zn coating is almost ten times higher compared with nickel substrate. The dealloyed (Ni-Zn)*/Ni material is more saturated with hydrogen than compact nickel. The hydrogen dissolution process from the composite electrode is a multi-step process including solid-phase diffusion of hydrogen and its ionization in a non-equilibrium mode.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

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