KFU. Card publication. Electrochemical alloying of zinc coatings from aqueous solutions of heteronuclear compounds

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ELECTROCHEMICAL ALLOYING OF ZINC COATINGS FROM AQUEOUS SOLUTIONS OF HETERONUCLEAR COMPOUNDS

Form of presentation

Articles in international journals and collections

Year of publication

2025

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Authors, employees of KFU

Ivanova Valentina Yurevna, author

Bibliographic description in the original language

Nikolay B. Berezin, Valentina Yu. Ivanova, Zhanna V. Mezhevich, Ayaz I. Tukhbatullin. Electrochemical alloying of zinc coatings from aqueous solutions of heteronuclear compounds. Butlerov Communications A. 2025. Vol.11. No.4. Id.14. DOI: 10.37952/ROI-jbc-01/25-84-12-36/ROI-jbc-A/25-11-4-14

Annotation

The study is devoted to the electrochemical alloying of zinc coatings with nickel and cobalt compounds from glycinate solutions. The paper presents data on complexation in the zinc(II) – nickel(II) – cobalt(II) – glycinewater system, electrochemical alloying of zinc coatings with nickel and cobalt, as well as corrosion studies. Experimental data were obtained at 25 ?C. The HI 2215 pH/ORPMeter was used to measure pH. pHmetric titration was used to determine the composition of the complexes. The constants of complex formation and their accumulation fractions were calculated using the CPESSP program. The compositions of heteronuclear compounds have been established [NiCoZn(OH)4Gly6]4−, [NiCoZn(OH)4Gly3]−,NiCoZn(OH)3Gly3,[NiCoZn(OH)2Gly3]+, [NiCoZnGly3]3+, [NiCoZn(HGly)Gly2]4+, the proportions of their accumulation and the constants of formation. An increase in the proportion of accumulation of heteronuclear compounds occurs at pH 5.5 and above. The elemental composition of zinc coatings alloyed with nickel and cobalt was determined by X-ray fluorescence analysis. The measurements were carried out on an X-STRATA 980 analyzer. It was found that at current densities of 1-5 A/dm2, the nickel content is 2.5-3.5%, and cobalt 0.5-3.0%. Corrosion tests were carried out in an aqueous solution of 3% sodium chloride. The established mass and depth parameters for alloyed coatings have two times lower values compared to zinc coatings obtained from sulfate electrolyte GOST 9.305-84. Some considerations on the electrochemical reactivity of heteronuclear complexes are expressed in the work. In particular, it is noted that electrochemical reduction of more electronegative metals, if they are in a heteronuclear complex, should occur with a lower activation energy. Thus, during the formation of heteronuclear compounds, the orbital of a more negative metal makes a greater contribution to the binding orbital, and a less negative one to the loosening one. Therefore, such filling of orbitals with electrons should contribute to the electrochemical reduction of a more negative metal, more precisely, its ion in a complex compound.

Keywords

complex heteronuclear compounds, zinc(II), nickel(II), cobalt(II), glycine, pH-metric titration, CPESSP program, alloying, corrosion resistance of coatings

The name of the journal

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https://repository.kpfu.ru/eng/?p_id=323173&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Ivanova Valentina Yurevna	ru_RU
dc.date.accessioned	2025-01-01T00:00:00Z	ru_RU
dc.date.available	2025-01-01T00:00:00Z	ru_RU
dc.date.issued	2025	ru_RU
dc.identifier.citation	Nikolay B. Berezin, Valentina Yu. Ivanova, Zhanna V. Mezhevich, Ayaz I. Tukhbatullin. Electrochemical alloying of zinc coatings from aqueous solutions of heteronuclear compounds. Butlerov Communications A. 2025. Vol.11. No.4. Id.14. DOI: 10.37952/ROI-jbc-01/25-84-12-36/ROI-jbc-A/25-11-4-14	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=323173&p_lang=2	ru_RU
dc.description.abstract	��	ru_RU
dc.description.abstract	The study is devoted to the electrochemical alloying of zinc coatings with nickel and cobalt compounds from glycinate solutions. The paper presents data on complexation in the zinc(II) – nickel(II) – cobalt(II) – glycinewater system, electrochemical alloying of zinc coatings with nickel and cobalt, as well as corrosion studies. Experimental data were obtained at 25 ?C. The HI 2215 pH/ORPMeter was used to measure pH. pHmetric titration was used to determine the composition of the complexes. The constants of complex formation and their accumulation fractions were calculated using the CPESSP program. The compositions of heteronuclear compounds have been established [NiCoZn(OH)4Gly6]4−, [NiCoZn(OH)4Gly3]−,NiCoZn(OH)3Gly3,[NiCoZn(OH)2Gly3]+, [NiCoZnGly3]3+, [NiCoZn(HGly)Gly2]4+, the proportions of their accumulation and the constants of formation. An increase in the proportion of accumulation of heteronuclear compounds occurs at pH 5.5 and above. The elemental composition of zinc coatings alloyed with nickel and cobalt was determined by X-ray fluorescence analysis. The measurements were carried out on an X-STRATA 980 analyzer. It was found that at current densities of 1-5 A/dm2, the nickel content is 2.5-3.5%, and cobalt 0.5-3.0%. Corrosion tests were carried out in an aqueous solution of 3% sodium chloride. The established mass and depth parameters for alloyed coatings have two times lower values compared to zinc coatings obtained from sulfate electrolyte GOST 9.305-84. Some considerations on the electrochemical reactivity of heteronuclear complexes are expressed in the work. In particular, it is noted that electrochemical reduction of more electronegative metals, if they are in a heteronuclear complex, should occur with a lower activation energy. Thus, during the formation of heteronuclear compounds, the orbital of a more negative metal makes a greater contribution to the binding orbital, and a less negative one to the loosening one. Therefore, such filling of orbitals with electrons should contribute to the electrochemical reduction of a more negative metal, more precisely, its ion in a complex compound.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	complex heteronuclear compounds	ru_RU
dc.subject	zinc(II)	ru_RU
dc.subject	nickel(II)	ru_RU
dc.subject	cobalt(II)	ru_RU
dc.subject	glycine	ru_RU
dc.subject	pH-metric titration	ru_RU
dc.subject	CPESSP program	ru_RU
dc.subject	alloying	ru_RU
dc.subject	corrosion resistance of coatings	ru_RU
dc.title	Electrochemical alloying of zinc coatings from aqueous solutions of heteronuclear compounds	ru_RU
dc.type	Articles in international journals and collections	ru_RU