DOI: https://doi.org/10.32515/2414-3820.2021.51.182-187

Wearproofness of Layers of Oxide of Formed by Method of Hard Anodization (Hard Anodic Coatings) at Strengthening of Details of Agroindustrial Technique

Mykhajlo Student, Sergiy Markovych, Volodymyr Hvozdetskii, Khrystyna Zadorozhna, Igor Kovalchuk, Yurii Dzjoba

About the Authors

Mykhajlo Student, Senior Researcher, Professor, Doctor in Technics (Doctor of Technics Sciences), Karpenko Physico-Mechanical Institute of NAS of Ukraine, Lviv, Ukraine, e-mail: student.phmi@gmail.com, ORCID ID: 0000-0002-5992-5898

Sergiy Markovych, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukrainian National Technical University, Kropyvnytskyi, Ukraine, e-mail: marko60@ukr.net, ORCID ID: 0000-0003-1393-2360

Volodymyr Hvozdetskii, Senior Researcher, PhD in Technics (Candidate of Technics Sciences), Karpenko Physico-Mechanical Institute of NAS of Ukraine, Lviv, Ukraine, e-mail: gvosdetcki@gmail.com

Khrystyna Zadorozhna, Researcher, PhD in Technics (Candidate of Technics Sciences), Karpenko Physico-Mechanical Institute of NAS of Ukraine, Lviv, Ukraine, ORCID ID: 0000-0002-1310-6467

Igor Kovalchuk, Junior Research Fellow, PhD in Technics (Candidate of Technics Sciences), Karpenko Physico-Mechanical Institute of NAS of Ukraine, Lviv, Ukraine

Yurii Dzjoba, Chief Engineer, Karpenko Physico-Mechanical Institute of NAS of Ukraine, Lviv, Ukraine

Abstract

In the last years in an agroindustrial production there is a tendency on replacement of cast-iron details on a detail from aluminium alloys at execution on поверхю of strengthening layer. An ironmaking is accompanied the extrass of plenty of carbon dioxide in an atmosphere. Substituting of cast-iron details by aluminium will decrease the amount of extrass of carbon dioxide in an atmosphere, and substantially will decrease weight of constructions. Hard anodization is used practically in all of industries of industry: avsup and motor-car industry; hydraulics; electronics; heater platforms and tiles; medical devices. This method will allow to promote mechanical descriptions of aluminium alloys the method of forming of the anodized layers on their surface. The synthesis of the anodized layer on an aluminum alloy was performed in a 20% solution of sulfuric acid at a temperature of (-8…-2 ˚C). During anodizing, the current density was 5 A / dm2. The anodizing times were 60, 120 and 180 minutes. Conducted metallographic studies and phase analysis of the layers. Reduction of moisture content was performed at a temperature of 400˚C for 60 minutes. It was found that the oxide layer (Al2O3 • H2O) during hard anodizing on aluminum alloys forms not only oxygen ions, which are formed due to the decomposition of water, but also its neutral atoms, which are formed from the solution. It was found that the microhardness and layer thickness increase with increasing anodizing time. After heat treatment, the number of water molecules decreases and the microhardness increases. Increasing the microhardness increases the resistance to abrasive wear. Conclusions: The layer of oxide in the composition contains to three molecules of water, which reduce a microhardness, and and wearproofness of the anodized layer substantially. The layers of oxide on aluminium alloys are formed the method of cold anodization at low temperatures -8…-4 ˚C to 6 time promote abrasive wearproofness of aluminium alloy of D16. Heat treatment for the temperatures of 400˚C during 2 hours promotes abrasive wearproofness of aluminium alloy on an order.

Keywords

нard anodizing, aluminum, anodized layer, pores, wear resistance

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References

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8. Quang-Phu Tran, Tsung-Shune Chin (2016). Plasma electrolytic oxation coating on 6061 Al alloy using an electrolyte without alkali ions // Journal of Science and Technology. 54 (5A). P. 151-158.

Citations

  1. Improvement of wear resistance of aluminum alloy by HVOF method / Hutsaylyuk, V., Student, M., Zadorozhna, K. et al. Journal of Materials Research and Technology. 2020. 9(6). Pp. 16367–16377.
  2. The Effect of Increasing the Air Flow Pressure on the Properties of Coatings during the Arc Spraying of Cored Wires, Student M.a, Gvozdetsky V.a, Student O.a, Prentkovskis O.b, Maruschak P.cSend mail to Maruschak P., Olenyuk O.d, Titova L., Strojnicky Casopis, 2019, 69(4), pp. 133–146.
  3. The properties of oxide-ceramic layers with Cu and Ni inclusions synthesizing by PEO method on top of the gas-spraying coatings on aluminium alloys, Hutsaylyuk, V., Student, M., Posuvailo, V., ...Maruschak, P., Veselivska, H., Vacuum, 2020, 179, 109514.
  4. Improvement of wear resistance of aluminum alloy by HVOF method, Hutsaylyuk, V., Student, M., Zadorozhna, K., ...Maruschak, P., Pokhmurska, H., Journal of Materials Research and Technology, 2020, 9(6), pp. 16367–16377.
  5. Tribological behavior of PEO layers synthesized on light alloy Student, M., Padgurskas, J., Dovhunyk, V., ...Posuvailo, V., Hvozdetskyi, V., Proceedings of 10th International Scientific Conference BALTTRIB 2019, 2019, pp. 268–273
  6. Ning-ning Hu, Shi-rong Ge and Liang Fang. Tribological properties of nano-porous anodic alu¬minum oxide template . J. of Central South University of Tech. 2011. 18. Р. 1004−1008.
  7. Alaa M. Abd-Elnaiem, Gaber A. Parametric study on the anodization of fabricating nano-pores template . Int. J. Electrochem. Sci. 2013. 13. P. 9741–9751.
  8. Quang-Phu Tran, Tsung-Shune Chin Plasma electrolytic oxation coating on 6061 Al alloy using an electrolyte without alkali ions . Journal of Science and Technology. 2016. 54 (5A). P. 151-158.
Copyright (c) 2021 Mykhajlo Student, Sergiy Markovych, Volodymyr Hvozdetskii, Khrystyna Zadorozhna, Igor Kovalchuk, Yurii Dzjoba