CORROSION RESISTANCE OF GALVANIC NICKEL DEPOSITS AND ELECTROCHEMICAL ACTIVITY OF THEIR CORROSION PRODUCTS

Authors

  • Dmytro Uschapovskyi Національний технічний університет України "Київський політехнічний інститут", Кафедра технології електрохімічних виробництв, Ukraine http://orcid.org/0000-0002-2809-2774
  • Olga Linyucheva Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського», Ukraine https://orcid.org/0000-0003-4181-5946
  • Georgyi Vasiliev Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» , Ukraine https://orcid.org/0000-0003-4056-5551
  • Oleksander Liniuchev Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» , Ukraine https://orcid.org/0000-0003-1683-5937
  • Andrey Kushmyruk Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського», Ukraine https://orcid.org/0000-0002-8167-6277
  • Raisa Redko Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського», Ukraine https://orcid.org/0000-0003-3462-4447
  • Gleb Pidvashetsky Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» , Ukraine https://orcid.org/0000-0002-9367-6688
  • Taras Kurochenko Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського, Ukraine https://orcid.org/0000-0002-9569-9998

DOI:

https://doi.org/10.20535/kpisn.2022.1-2.253045

Keywords:

nickel coatings, corrosion products, nickel sulphides, corrosion activity, catalyst

Abstract

Background. Bright galvanic nickel coatings, with high sulphur content, are less corrosion resistant than matte. Bright nickel coatings are particularly susceptible to corrosion damage in conditions that simulate tropical humid climates and are characterized by the presence of acetic acid vapours.

Objective. The purpose of the paper is to investigate: corrosion resistance of galvanic nickel deposits in concentrated acetic acid and its vapours, electrochemical activity of sulphide-containing corrosion products of bright nickel coatings.

Methods. Potentiodynamic and cyclic volt-amperometry have been used to study the electrochemical activity of galvanic nickel deposits and their corrosion products. The corrosion rate of galvanic nickel deposits has been determined by gravimetric method. Investigation of surface morphology and composition of galvanic deposits were performed using scanning electron microscopy and X-ray fluorescence analysis.

Results.The increased electrochemical activity of sulphide corrosion products of bright nickel coatings is evidenced by an order of magnitude higher cathodic current densities of CVA curves obtained in acetate buffer solutions, in comparison with bright and matte nickel galvanic deposits. It has been shown that at the deposition of sulphide corrosion products of bright nickel coatings on matte nickel foil the corrosion rate of last one increase at the exposition in concentrated acetic acid and its vapours.

Conclusions. Significant intensifying effect of sulphur on the corrosion of galvanic nickel deposits in concentrated acetic acid and its vapours has been established. In particular, this can be explained by the decomposition of nickel sulphide (which incorporates in the coating) in acetic acid. Sulphur in the oxidation state (-2) interacts with passive oxide coatings to form an adsorbed monolayer, which leads to the transition of nickel to the active state. Further research will focus on a deeper study of the electrochemical properties of corrosion products of bright nickel coatings.

Author Biography

Dmytro Uschapovskyi, Національний технічний університет України "Київський політехнічний інститут", Кафедра технології електрохімічних виробництв

аспірант, науковий співробітник кафедри технології електрохімічних виробництв, НТУУ "КПІ"

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Published

2023-10-27

Issue

Vol. 135 No. 1-2 (2022)

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Статті

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Copyright (c) 2022 Дмитро Ущаповський, Ольга Лінючева, Георгій Васильєв, Олександр Лінючев , Андрій Кушмирук , Раїса Редько , Гліб Підвашецький , Тарас Куроченко

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