Electrodeposition of Graphene Oxide Modified Composite Coatings Based on Nickel-Chromium Alloy

Vitaly Tseluikin,Marina Lopukhova,Andrey Yakovlev,Asel Dzhumieva,Anton Mostovoy

doi:10.3390/cryst11040415

Vitaly Tseluikin, Marina Lopukhova + Show 3 more

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https://doi.org/10.3390/cryst11040415

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Journal: Crystals	Publication Date: Apr 13, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Yuri Gagarin State Technical University of Saratov

Abstract

Composite electrochemical coatings (CECs) based on nickel-chromium alloy and modified with multilayer graphene oxide (GO) were obtained. The electrodeposition process of these coatings was studied in the potentiodynamic mode. The structure and the composition of nickel–chromium–GO CECs were studied by scanning electron microscopy and laser microspectral analysis. Nickel–chromium–GO CECs are dense and uniform. The carbon content in them increases when moving from the substrate to the surface. It was established that the addition of GO particles into the composition of electrolytic coatings with a nickel-chromium alloy results in the increase in their microhardness from 4423–5480 MPa to 6120–7320 MPa depending on the cathodic current density.

Highlights

The deposition of composite electrochemical coatings (CECs) is a reliable and economically feasible method for modifying metal surfaces in order to impart new functional properties to them [1,2,3]
The nickel-chromium alloy in the presence of dispersed particles is deposited on the cathode at less negative potentials, i.e., the process proceeds with depolarization
The electrodeposition currents of nickel–chromium–graphene oxide (GO) CECs increase as compared to the coatings with a pure alloy, and this testifies about an increase in the rate of the cathodic process

Summary

Introduction

The deposition of composite electrochemical coatings (CECs) is a reliable and economically feasible method for modifying metal surfaces in order to impart new functional properties to them [1,2,3]. Among the CECs, coatings based on nickel [4,5,6,7,8,9,10,11,12] and its alloys [13,14,15,16,17,18,19,20,21,22]. Obtaining electroplated coatings with alloys is a technically more complicated process compared to the cathodic deposition of individual metals. Electrolytic nickel-chromium alloys which are used as hard and wear-resistant coatings [14,21]. It should be noted that the physicomechanical properties (microhardness, wear resistance, etc.) of such coatings depends on the parameters of electrolytic deposition process

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