Electric Arc Spraying of Composite Metal-Polymer Coatings

Authors

  • А. А. Karpechenko Admiral Makarov National University of Shipbuilding, Mykolaiv
  • M. M. Bobrov Admiral Makarov National University of Shipbuilding, Mykolaiv
  • О. О. Lymar Mykolaiv National Agrarian University

DOI:

https://doi.org/10.31649/1997-9266-2021-155-2-114-119

Keywords:

electric arc spraying, composite coatings, thermal conductivity, microhardness, polymer

Abstract

A method for forming composite electric arc coatings by using a modernized EM-14M spraying gun with a powder feed unit of free powder to a high-temperature heterophase jet during spraying is proposed. Samples of a metal-polymer composite coating of the composition steel Sv-08-G2S-O — polymer P-EP-219 were obtained. Experimentally established the necessary zone for the supply of polymer powder was to prevent its destruction in the high-temperature zone of the arc discharge and the optimal modes of deposition metal-polymer coatings: current 90…100 A, arc voltage 25 V, compressed air pressure 0,4…0,6 MPa, polymer powder consumption 25 g/min, spraying distance 100...120 mm. If these modes are observed, the conditions for the formation of a high-quality metal-polymer coating with a thickness of 0.5-0.8 mm with a maximum content of the polymer component of 40 %(vol.) are provided. A scanning electron microscope REMMA-102-02 was used to investigate the microstructure of the sprayed coatings. It has been established that the porosity of composite coatings is reduced from 13 % to 7 % in comparison with convention steel coatings. The phases were identified by determining their microhardness on cross sections with a load on the indenter of 50 g. It was found that the microhardness of the metal matrix is 1716 MPa; polymer component — 128 MPa. It is shown that the deposited coatings are characterized by the presence on their surface of a continuous polymer film with a thickness of 10 to 100 μm, which is formed as a result of the fact that the polymer solidifies later than the crystallization of metal particles. It has been experimentally confirmed that the thermal conductivity of metal-polymer coatings deposited from the SV-08G2S-O – P-EP-219 composition decreases by 46 % in comparison with the thermal conductivity of convention coatings from SV-08G2S-O wire. The proposed coatings are recommended to be used as anticorrosion and heat-insulating coatings on various structures due to the thin surface polymer film and low thermal conductivity.

Author Biographies

А. А. Karpechenko, Admiral Makarov National University of Shipbuilding, Mykolaiv

Cand. Sc. (Eng.), Associate Professor of the Chair of Material Science and Technology of Metals

M. M. Bobrov, Admiral Makarov National University of Shipbuilding, Mykolaiv

Cand. Sc. (Eng.), Assistant of the Chair of Material Science and Technology of Metals

О. О. Lymar, Mykolaiv National Agrarian University

Cand. Sc. (Phys.-Math.), Assistant of the Chair of Tractors and Agricultural Machinery, Operating and Maintenance

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Published

2021-04-30

How to Cite

[1]
Karpechenko А. А., M. M. . Bobrov, and Lymar О. О. ., “Electric Arc Spraying of Composite Metal-Polymer Coatings”, Вісник ВПІ, no. 2, pp. 114–119, Apr. 2021.

Issue

No. 2 (2021)

Section

Mechanical engineering and transport

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