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

  • Silvana B. Dimitrijević , Mirjana M. Rajčić-Vujasinović , Dejan D. Trifunović , Biserka T. Trumić , Zoran M. Stević und Stevan P. Dimitrijević
Veröffentlicht/Copyright: 31. August 2016
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 107 Heft 7

Abstract

The aim of this work was to investigate the effects of current density, temperature, pH and concentration of ethylhexilsulfonate 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.

Keywords: Electroplating; Decorative coating of gold; Microhardness; Knoop method
*Correspondence address, Silvana Dimitrijević, PhD, Mining and Metallurgy Institute Bor, Zeleni bulevar 35, 19210 Bor, Serbia, Tel.: +381 606277888, Fax: +381 30435175, E-mail:

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Received: 2015-12-08
Accepted: 2016-02-29
Published Online: 2016-08-31
Published in Print: 2016-07-14

© 2016, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Interdiffusion in bcc_B2 Ni–Al–Cu alloys at 1 173 K
  5. Hydrogen storage kinetics of nanocrystalline and amorphous NdMg12-type alloy–Ni composites synthesized by mechanical milling
  6. Phase equilibria in the Au–Bi–Sn ternary system at temperatures of 80, 125, and 150 °C
  7. Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide
  8. Friction and wear of diamond-like carbon film deposited on CoCrMo alloy under different lubrication
  9. Wrought aluminium–magnesium alloys subjected to SPD processing
  10. Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys
  11. Gel-casting of porous alumina ceramics with high mechanical strength
  12. Comparing predictions from constitutive equations and artificial neural network model of compressive behavior in carbon nanotube–aluminum reinforced ZA27 composites
  13. Identification of the effective thermal conductivity of a powdered composite using a genetic algorithm
  14. Short Communications
  15. Boride coating on the surface of WC–Co-based cemented carbide
  16. People
  17. Prof. Dr. Dr. h. c. mult. Günter Petzow on the occasion of his 90th birthday
  18. DGM News
  19. DGM News
https://doi.org/10.3139/146.111382
Schlagwörter für diesen Artikel
Electroplating; Decorative coating of gold; Microhardness; Knoop method

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Original Contributions
  4. Interdiffusion in bcc_B2 Ni–Al–Cu alloys at 1 173 K
  5. Hydrogen storage kinetics of nanocrystalline and amorphous NdMg12-type alloy–Ni composites synthesized by mechanical milling
  6. Phase equilibria in the Au–Bi–Sn ternary system at temperatures of 80, 125, and 150 °C
  7. Microhardness of decorative gold coatings obtained from gold complex based on mercaptotriazole: Comparison with cyanide
  8. Friction and wear of diamond-like carbon film deposited on CoCrMo alloy under different lubrication
  9. Wrought aluminium–magnesium alloys subjected to SPD processing
  10. Relationships between mechanical and tribological properties of Zn-15Al-based ternary and quaternary alloys
  11. Gel-casting of porous alumina ceramics with high mechanical strength
  12. Comparing predictions from constitutive equations and artificial neural network model of compressive behavior in carbon nanotube–aluminum reinforced ZA27 composites
  13. Identification of the effective thermal conductivity of a powdered composite using a genetic algorithm
  14. Short Communications
  15. Boride coating on the surface of WC–Co-based cemented carbide
  16. People
  17. Prof. Dr. Dr. h. c. mult. Günter Petzow on the occasion of his 90th birthday
  18. DGM News
  19. DGM News
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