Composite-Electrochemical Gold-Diamond Coatings

The paper describes the process and quality of gold coating of metal surfaces in the presence of detonation nanodiamonds (DNDs). A literary and patent review of methods for obtaining composite gold coatings is given, indicating their characteristics and disadvantages. The modes, materials, and methods used in early sources and in this work are described. The behavior of DND in electrolytes and their ionization is given: the interaction between the surface of nanodiamonds and ions in solution. The properties and behavior of the gold-diamond associate in electrolytes and the difference from known additives are described. The influence of temperature, current strength, and pH of the medium on the deposition of a gold-diamond coating is investigated. The mechanism of deposition of the gold-diamond coating and the effect of the type of nanodiamond additive on the characteristics of the gold coating are described. The aim of the work is to increase the mechanical properties of the Au coating (wear resistance and microhardness) with low consumption of DND and using simple technology.

It is sufficient to maintain the concentration of DND in the gilding electrolyte at the level of 0,1…5,0%. There was no bimodal distribution of properties in the coating. DND, being included in the coating, does not worsen its electrophysical properties. The wear resistance of the gold-diamond coating increases significantly, higher current densities can be used, increasing the productivity of gilding baths. In addition, the introduction of DND changes the nature of the dependence of wear resistance on current density and makes it possible to obtain a coating with increased wear resistance.

1. Shluger, M. A. (1985). Electroplating coatings in mechanical engineering. Moscow: Mashinostroenie. (in Russ.)

2. Belenky, M. A., Ivanov, A. F. (1985). Electrodeposition of metal coatings: Handbook. Moscow: Metallurgiya. (in Russ.)

3. Volkov, K. V., Danilenko, V. V. & Elin, V. I. (1990). Synthesis of diamond from carbon of explosive detonation products. Physics of gorenje i explosion, 26 (3), 123-125. (in Russ.)

4. Danilenko, V. V. (2003). Synthesis and sintering of diamond by explosion. Moscow: Energoatomizdat. (in Russ.)

5. Dolmatov, V. Yu., Blinova, M. A. (2025). Synthesis of nanodiamonds: key patterns and possibilities of control. Russ. Chem. Rev, 94 (9), 5178. https://doi.org/10.59761/RCR5178

6. Yurev, G. S., Dolmatov, V. Yu. (2010). X-Ray Diffraction Study of Detonation Nanodiamonds. Journal of Superhard Materials, 32 (5), 311-328. https://doi.org/10.3103/S1063457610050035

7. Dolmatov, V. Yu., Yurev, G. S., Myllymaki, V. & Korolev, K .M. (2013). Why detonation nanodiamonds are small. Journal of Superhard Materials, 35 (2), 77-82. https://doi.org/10.3103/s1063457620040036

8. Dolmatov, V. Yu., Sushchev, V. G. & Marchukov, V. A. Method of isolation of synthetic ultrafine diamonds. Russian Patent No. 2109683, cl. C01B 31/06, 03/5/96. (in Russ.)

9. Wünsche, F., Bundand, A. & Plieth, W. (2004). Investigations on the Electrochemical Preparation of Gold-nanoparticle Coatings. J. of Solid State Electrochemistry, 8 (3), 209-213. https://doi.org/10.1007/s10008-003-0430-8

10. Gubarevich, T.M., Chernukho, L. E. (2005). Ultradisperse Diamond Modifications in the Composite Gilding Process. Synthesis, Properties and Applications of Ultrananocrystalline Diamond/ ed. by D. M. Gruen [et al.]. Springer, Printed in the Netherlands, 345-355. https://doi.org/10.1007/1-4020-3322-2_29

11. Dolmatov, V. Yu., Gubarevich, T. M. Synthetic carbon diamond–containing material. Russian Patent No. 2046094, C01B 31/04, 05/26/1993. publ. 10/20/1995. (in Russ.)

12. Gubarevich, T. M., Kostyukova, N. M., Larionova, I. S. & Poleva, L. I. (1991). Adsorption properties of ultrafine carbon materials. Report V All-Union. the meeting. by detonation. Krasnoyarsk, 1, 112-116. (in Russ.)

13. Novikov, N. V., Alyoshin, V. G., Smekhnov, A. A., Shishkin, A. A. & Shulzhenko, A. A. (1988). Influence of surface composition on the properties of diamond polycrystals. Report USSR Academy of Sciences, 300 (5), 1122-1126. (in Russ.)

14. Dolmatov, V. Yu., Gubarevich, T. M. Synthetic carbon diamond-containing material. Pat. 2046094 RF, prior. 07.26.1995; – BI No. 29, 1995, 189. (in Russ.)

15. Bogatyreva, G. P., Marinich, M. A. & Gvyazdovskaya, V. L. (2000). Diamond - an adsorbent of a new type. In Proceedings of IX European Conf. on Diamond, Diamond Like Material, Nitrides and Silicon Carbide. Crete, 9 (12), 2002-2005. https://doi.org/10.1016/S0925-9635(00)00351-4

16. Bogatyreva, G. P., Voloshin, M. N., Marinich, M. A., Malogolovets, V. G., Gvyazdovskaya, V. L. & Gavrilova, V. S. (1999). Surface and electrophysical properties of detonation synthesis nanodiamond. Superhard materials, (6), 42-46. (in Russ.)

17. Chukhaeva, S. I., Cheburina, L. A. (2000). Sorption activity of cesium nanodiamonds. Superhard materials, (2), 43-48. (in Russ.)

18. Distanov, U. G., Mikhailov, A. S. & Konyukhova, T. P. (1990). Natural sorbents of the USSR. Moscow: Nedra. (in Russ.)

19. Ignatchenko, A. V., Solokhina, A. B. & Irdyneeva, M. V. (1991). Electrosurface properties of ultrafine diamonds. Report V AllUnion Conference on Detonation, Krasnoyarsk, 1, 166-170. (in Russ.)

20. Ignatchenko, A. V., Solokhina, A. B. (1991). Fractal structure of ultrafine diamonds. Report V All–Union Conference on Detonation, Krasnoyarsk, 1, 164-165. (in Russ.)

21. Sakovich, G. V., Gubarevich, V. D., Badaev, F. Z., Brylyakov, P. M. & Besedina, O. A. (1990). Aggregation of diamonds obtained from explosives. Report USSR Academy of Sciences, 310 (2), 402-404. (in Russ.)

22. Karmanov, A. P., Dolmatov, V. Yu., Kocheva, L. S., Rachkova, N. G., Bogdanovich, N. I. & Almazova, N. S. (2021). Detonation nanodiamonds as adsorbents of uranium and thorium. Superhard materials, 43 (3), 67-79. (in Russ.)