Composition and

Ved, Maryna; Сахненко, Н. Д.; Yermolenko, Iryna; Yar-Mukhamedova, Gulmira; Atchibayev, R.

doi:10.18321/ectj697

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…Studies of the pitting resistance of AISI 304 and AISI 321 steels showed that it mainly depends on the parameters of model circulating waters (x i , x 2 ),the content in them Cr within the standard. At the same time, the results of the analysis (Table 3, № 5) of the mathematical model ( 1) are harmonized with the data of works [16,[31][32][33][34][35] CPT increases by 7.4°C with an increase in the Cr content in steels from 17.1 to 18.3 mass% (Table 1). The pitting resistance of steels and alloys alloyed with Cr is associated with oxide films formed by Cr with O [36 -40].…”

Section: Research Results and Discussionmentioning

confidence: 94%

“…The pitting resistance of steels and alloys alloyed with Cr is associated with oxide films formed by Cr with O [36 -40]. In addition, this element affects the solid-phase diffusion of Cr atoms to the surface of metastable pits and promotes their repassivation [33][34][35]. There is an evidence that Cr [41] increase the solubility of nitrogen in corrosionresistant steels, and, consequently, their pitting resistance.…”

Section: Research Results and Discussionmentioning

confidence: 99%

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Corrosion behavior of austenitic steels in chloride-containing media during the operation of plate-like heat exchangers

Narivs’kyi

2023

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Mathematical models that describe the dependences of the critical temperatures of pitting formation of AISI 304, 08Kh18N10, AISI 321, 12Kh18N10T steels in model circulating waters with pH 4…8 and chloride concentrations from 350 to 600 mg/l on their chemical composition and structure have been developed. They are based on linear squares regressions and on a feed-forward neural network for a reduced feature numbers. Using the developed mathematical models, it was found that the critical pitting temperatures of these steels increase with an increase in the pH of the circulating water, the amount of oxides up to 3.95 μm in size, the average distance between titanium nitrides, the Cr content and a decrease in the concentration of chlorides in the circulating waters, the average distance between oxides and average austenite grain diameter. At the same time, it was found that the geometric dimensions of the steel structure most intensively affect their pitting resistance in circulating waters, and the effect of their chemical composition is minimal and is determined by the amount of Cr, which contributes to an increase in the pitting resistance of steels, probably increasing the solubility of nitrogen in the austenite solid solution. It is proposed to use the developed mathematical models to select the optimal heats of these steels for the production of heat exchangers and predict their pitting resistance during their operation in circulating waters.

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Section: Research Results and Discussionmentioning

confidence: 94%

Section: Research Results and Discussionmentioning

confidence: 99%

Corrosion behavior of austenitic steels in chloride-containing media during the operation of plate-like heat exchangers

Narivs’kyi

2023

phst

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“…The parameters Ra and Rq for the electrolytic alloy Fe-Co-W are of 0.3, which noticeably exceeds the performance of a binary coating and polished steel substrate. It was previously shown [26,27] that the globular nature of the surface is due to the presence of tungsten in the coating and may be a prerequisite for the high microhardness and catalytic activity of the material.…”

Section: Resultsmentioning

confidence: 99%

Effect of Electrodeposition Parameters on the Composition and Surface Topography of Nanostructured Coatings by Tungsten with Iron and Cobalt

Yar-Mukhamedova¹,

Ved²,

Yermolenko³

et al. 2020

Eurasian Chem. Tech. J.

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The electrodeposition of binary and ternary coatings Fe-W and Fe-Co-W from mono ligand citrate electrolyte has been investigated. The Fe-Co-W coatings were formed from electrolytes, which composition differs in the ratio of the concentrations of the alloying components and the ligand content. The investigation results indicate a competitive reduction of iron, cobalt and tungsten, the nature of which depends both on the ratio of electrolyte components, and electrolysis parameters. The effect of both current density amplitude and pulse on off time on quality, composition and surface morphology of the galvanic alloys was determined. Coatings deposited on a direct current with a density of more than 6.5 A/dm 2 , crack and peel off from the substrate due to the inclusion of Fe (III) compounds containing hydroxide anions. The use of non-stationary electrolysis allows us to extend the working range of current density to 8.0 A/dm 2 and form electrolytic coatings of sufficient quality with significant current efficiency and the content of the refractory component. The presence of the Co 7 W 6 , Fe 7 W 6 , α-Fe, and Fe 3 C phases detected in the Fe-Co-W deposits reflects the competition between the alloying metals reducing from hetero-nuclear complexes. The surface of binary and ternary coatings is characterized by the presence of spherical agglomerates and is more developed in comparison with steel substrate. The parameters Ra and Rq for electrolytic alloy Fe-W are of 0.1, for Fe-Co-W are 0.3, which exceeds the performance of a polished steel substrate (Ra = 0.007 and Rq = 0.010). These properties prospect such alloys as a multifunctional layer are associated with structural features, surface morphology, and phase composition.

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Analysis of corrosion resistance of nano structured Co-W coatings through electrodeposition technique coated on the surface of mild steel

Srinivasan¹,

Sooraj²,

Kannan³

et al. 2022

The 8th Annual International Seminar on Trends in Science and Science Education (Aistsse) 2021

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Composition and

Cited by 5 publications

References 35 publications

Corrosion behavior of austenitic steels in chloride-containing media during the operation of plate-like heat exchangers

Corrosion behavior of austenitic steels in chloride-containing media during the operation of plate-like heat exchangers

Effect of Electrodeposition Parameters on the Composition and Surface Topography of Nanostructured Coatings by Tungsten with Iron and Cobalt

Analysis of corrosion resistance of nano structured Co-W coatings through electrodeposition technique coated on the surface of mild steel

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