OBRABOTKA METALLOV
METAL WORKING AND MATERIAL SCIENCEPrint ISSN: 1994-6309 Online ISSN: 2541-819X
Introduction. Nowadays, the development of alloys with a high glass-forming ability and the study of its physical and mechanical properties are among the most important directions in materials science. Iron-based multi-component alloys with high glass-forming ability have high corrosion resistance, wear resistance and relatively low cost, which makes it promising for application on the working surfaces of parts that work under conditions of abrasive wear and aggressive environment. Methods of thermal spraying (plasma spraying, detonation spraying, high-velocity oxy-fuel spraying, etc.) allow producing coatings with amorphous structure from iron-based alloys. Due to the process features, detonation spraying allows to obtain high quality coatings with the structure of metal glass in comparison with other methods of thermal spraying. The purpose of the work is to study the influence of phase composition of detonation coatings from a multi-component iron-based alloy on the resistance to atmospheric corrosion in conditions of neutral salt spray. Detonation coatings from amorphous alloy Fe66Cr10Nb5B19 obtained at different charges of explosive mixture are investigated. The methods of investigation: testing of detonation coatings under simulated conditions of atmospheric corrosion in salt spray chamber according to ASTM B117 in an atmosphere of a spray 5% sodium chloride solution in water for 600 hours at room temperature, as well as conducting X-ray phase and metallographic studies of coatings before and after tests. Results and Discussion. The results of investigation the phase composition and morphology of the coatings after the tests showed its high corrosion resistance in a neutral salt fog containing a large amount of chlorine anions. On the cross sections of those coatings no traces of corrosion penetration were found, which confirms the effectiveness of detonation coatings with the structure of metal glass from the alloy Fe66Cr10Nb5B19 for protection of parts that work under conditions of high atmospheric humidity, without sealing the surface.
Kuchumova Ivanna
Batraev Igor
Cherkasova Nina
Ukhina Arina
Shtertser Alexander
Jorge Alberto Moreira
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Funding
The reported research was funded by the Russian Foundation for Basic Research and the government the Novosibirsk region, project 19-43-543034 r_mol_a.
Acknowledgements
The authors are grateful to Konstantin B. Gerasimov for his help in conducting DSC investigation.
Kuchumova I.D., Batraev I.S., Cherkasova N.Y., Ukhina A.V., Shtertser A.A., Jorge A.M. The influence of salt fog exposure on corrosion resistance of detonation coatings Fe66Cr10Nb5B19. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2020, vol. 22, no. 3, pp. 95-105.DOI: 10.17212/1994-6309-2020-22.3-95-105. (In Russian).
