Galimov D.M., Ardashev D.V., Degtyareva-Kashutina A.S. Studying the Quality of a Chromium Coating Applied on Titanium Parts by Electroplating with Discrete Changes in the Time and Current Parameters of Chrome Plating

DOI: 10.18503/1995-2732-2023-21-2-37-46

Abstract

The application of a galvanic chromium coating expands the use of titanium parts, for example, for offshore oil and gas platform structures. The technology of an electrochemical deposition of chromium on the surface of titanium parts is based on special approaches, consisting in the surface preparation, the use of special electrolyte compositions, and the formation of an electrically conductive film on the part surface. We previously described and implemented the technologies for applying chromium on the outer and inner surfaces of hydraulic cylinders made of steel alloys. This paper presents the results of studying the quality of a chromium coating on titanium parts applied by the previously mentioned approaches in the implementation of galvanic chromium plating technologies used for steel parts. The samples presented for the study are discs cut from VT22 titanium alloy rods with the chromium coating applied in an electroplating machine in four modes. The paper presents the studies on microhardness of the chromium coating and the part base material, and the morphology of the coatings and their microstructure. The layer of the oxidized base material was determined for some samples with a loose adhesion of the chromium coating on the titanium part. The other samples had a proper adhesion and a uniform distribution of the coating over the titanium alloy surface. The probable reason for such an intermediate layer is the use of the “reverse” current mode. The authors concluded that the chromium coating microstructure was determined by the electrochemical deposition mode, while the stepwise change in the current density contributed to the formation of a layered structure of the coating.

Keywords

electrolytic chromium plating, titanium, electrolyte, potential, current density

For citation

Galimov D.M., Ardashev D.V., Degtyareva-Kashutina A.S. Studying the Quality of a Chromium Coating Applied on Titanium Parts by Electroplating with Discrete Changes in the Time and Current Parameters of Chrome Plating. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 2, pp. 37-46. https://doi.org/10.18503/1995-2732-2023-21-2-37-46

Damir M. Galimov – Researcher, South Ural State University (National Research University), Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-6060-5525

Dmitry V. Ardashev – DrSc (Eng), Associate Professor, South Ural State University (National Research University), Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0002-8134-2525

Anastasia S. Degtyareva-Kashutina – Senior Lecturer, South Ural State University (National Research University), Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it.. ORCID 0000-0003-1781-0395

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