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Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide

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Authors
Dimitrijević, Silvana
Rajčić-Vujasinović, Mirjana M.
Trifunović, Dejan
Trumić, Biserka
Stević, Zoran
Dimitrijević, Stevan
Article (Published version)
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Abstract
The aim of this work was to investigate the effects of current density, temperature, pH and concentration of ethyl-hexilsulfonate additive on the microhardness of electrochemically deposited gold decorative coatings obtained from a conventional cyanide electrolyte and gold complex based on mercaptotriazole. Mechanically and chemically prepared brass samples were first nickeled from acidic electrolyte. Nickel was a substrate deposit, and then decorative gold coatings were deposited from two types of electrolytes at different current densities and temperatures. Decorative gold coatings were deposited from auri-mercaptotrizole at different pH values and from electrolyte with and without the ethylhexilsulfonate additive. The microhardness of the gold coating was measured using the Knoop method. The highest values of microhardness were obtained at a current density of 1 A dm(-2) at room temperature for both electrolytes. The microhardness of the gold coatings from cyanide electrolytes was H...K = 740 MPa, and the coatings obtained from auri-mercaptotriazole HK = 660 MPa. This difference is not relevant for decorative purposes. The highest values of microhardness, HK = 660 MPa, were obtained at pH = 9 from the gold complex based on mercaptotriazole without the additive.

Keywords:
Electroplating / Decorative coating of gold / Microhardness / Knoop method
Source:
International Journal of Materials Research, 2016, 107, 7, 624-630
Publisher:
  • Carl Hanser Verlag, Munich
Funding / projects:
  • Development of technologies for recycling of precisious, rare and associated metals from solid waste in Serbia to high purity products (RS-34024)
  • Innovative synergy of by-products, waste minimization and clean technologies in metallurgy (RS-34033)

DOI: 10.3139/146.111382

ISSN: 1862-5282

WoS: 000380849500004

Scopus: 2-s2.0-84981731122
[ Google Scholar ]
5
3
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3224
Collections
  • Radovi istraživača (Inovacioni centar) / Researchers’ publications (Innovation Centre)
Institution/Community
Inovacioni centar
TY  - JOUR
AU  - Dimitrijević, Silvana
AU  - Rajčić-Vujasinović, Mirjana M.
AU  - Trifunović, Dejan
AU  - Trumić, Biserka
AU  - Stević, Zoran
AU  - Dimitrijević, Stevan
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3224
AB  - The aim of this work was to investigate the effects of current density, temperature, pH and concentration of ethyl-hexilsulfonate additive on the microhardness of electrochemically deposited gold decorative coatings obtained from a conventional cyanide electrolyte and gold complex based on mercaptotriazole. Mechanically and chemically prepared brass samples were first nickeled from acidic electrolyte. Nickel was a substrate deposit, and then decorative gold coatings were deposited from two types of electrolytes at different current densities and temperatures. Decorative gold coatings were deposited from auri-mercaptotrizole at different pH values and from electrolyte with and without the ethylhexilsulfonate additive. The microhardness of the gold coating was measured using the Knoop method. The highest values of microhardness were obtained at a current density of 1 A dm(-2) at room temperature for both electrolytes. The microhardness of the gold coatings from cyanide electrolytes was HK = 740 MPa, and the coatings obtained from auri-mercaptotriazole HK = 660 MPa. This difference is not relevant for decorative purposes. The highest values of microhardness, HK = 660 MPa, were obtained at pH = 9 from the gold complex based on mercaptotriazole without the additive.
PB  - Carl Hanser Verlag, Munich
T2  - International Journal of Materials Research
T1  - Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide
EP  - 630
IS  - 7
SP  - 624
VL  - 107
DO  - 10.3139/146.111382
ER  - 
@article{
author = "Dimitrijević, Silvana and Rajčić-Vujasinović, Mirjana M. and Trifunović, Dejan and Trumić, Biserka and Stević, Zoran and Dimitrijević, Stevan",
year = "2016",
abstract = "The aim of this work was to investigate the effects of current density, temperature, pH and concentration of ethyl-hexilsulfonate additive on the microhardness of electrochemically deposited gold decorative coatings obtained from a conventional cyanide electrolyte and gold complex based on mercaptotriazole. Mechanically and chemically prepared brass samples were first nickeled from acidic electrolyte. Nickel was a substrate deposit, and then decorative gold coatings were deposited from two types of electrolytes at different current densities and temperatures. Decorative gold coatings were deposited from auri-mercaptotrizole at different pH values and from electrolyte with and without the ethylhexilsulfonate additive. The microhardness of the gold coating was measured using the Knoop method. The highest values of microhardness were obtained at a current density of 1 A dm(-2) at room temperature for both electrolytes. The microhardness of the gold coatings from cyanide electrolytes was HK = 740 MPa, and the coatings obtained from auri-mercaptotriazole HK = 660 MPa. This difference is not relevant for decorative purposes. The highest values of microhardness, HK = 660 MPa, were obtained at pH = 9 from the gold complex based on mercaptotriazole without the additive.",
publisher = "Carl Hanser Verlag, Munich",
journal = "International Journal of Materials Research",
title = "Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide",
pages = "630-624",
number = "7",
volume = "107",
doi = "10.3139/146.111382"
}
Dimitrijević, S., Rajčić-Vujasinović, M. M., Trifunović, D., Trumić, B., Stević, Z.,& Dimitrijević, S.. (2016). Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide. in International Journal of Materials Research
Carl Hanser Verlag, Munich., 107(7), 624-630.
https://doi.org/10.3139/146.111382
Dimitrijević S, Rajčić-Vujasinović MM, Trifunović D, Trumić B, Stević Z, Dimitrijević S. Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide. in International Journal of Materials Research. 2016;107(7):624-630.
doi:10.3139/146.111382 .
Dimitrijević, Silvana, Rajčić-Vujasinović, Mirjana M., Trifunović, Dejan, Trumić, Biserka, Stević, Zoran, Dimitrijević, Stevan, "Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide" in International Journal of Materials Research, 107, no. 7 (2016):624-630,
https://doi.org/10.3139/146.111382 . .

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