Title: A chrome coating from a trivalent chromium bath containing extremely low concentration of Cr3+ ions

Authors: Ramazan Katırcı

Addresses: ASR Electrochemistry Co., Okmeydanı, 34400, İstanbul, Turkey

Abstract: In this study, the effects of saccharine on physical and chemical properties of Cr electrodeposition were investigated using electrochemical methods (linear voltammetry and impedance) and surface analysis methods [scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy (SEM-EDS)]. According to voltammetric and EIS measurement results, saccharine shifted Eonset to the negative area, which hinder the evolution of H2 gas and decrease the charge transfer of Cr coating, which increase the efficiency of Cr coating. According to the SEM results, it was found that saccharine increased the number of cracks on the surface. The most important result of this study is that saccharine makes Cr coating possible in the extremely low concentration of Cr3+ ion in a trivalent Cr bath.

Keywords: trivalent chromium electroplating; saccharin; malonic acid; chromium electrodeposition; chrome coatings; surface cracking.

DOI: 10.1504/IJSURFSE.2016.075318

International Journal of Surface Science and Engineering, 2016 Vol.10 No.1, pp.73 - 85

Received: 26 Sep 2014
Accepted: 20 Nov 2014

Published online: 11 Mar 2016 *

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