Improving Producing Characteristics of Constructions through FE-NI and FE-NI-CR Alloy Coatings with a Given Structure

Abstract:

The article considers innovative materials that are recommended to be used as a coating for reinforcement of bearing structures of high-rise buildings, bridges, tunnels and underground structures, and as a coating for storagetanks of crude oil instead of high-alloy steel grades 20H23N18, 08H18N10. Nanostructural alloy coating Fe-Ni (> 80% Fe) and alloy coating Fe-Ni-Cr (> 70% Fe), containing in addition to α-Fe a new phase ε-Fe with hexagonal close-packed lattice (GPUr) were obtained by high frequency periodic current at atmospheric pressure and room temperature. Existence of phase ε-Fe was confirmed by X-ray diffraction method, electron-probe test with an electronic probe, scanning atomic force microscopy. Phase transition α-Fe → ε-Fe was observed in the deposition process. A special feature of this phase is the presence of a nanocrystal structure. The main factors in the formation of the hexagonal system are the frequency and duty cycle. The maximum number of ε-Fe phase in the Fe-Ni alloy is 30% and the alloy Fe-Ni-Cr is 20%. This phase has an essential effect on the producing characteristics of the studied coatings. Due to the corrosion resistance in the chloride ions environment Fe-Ni alloy deposited by a high frequency alternating current is 7.5 times greater than high-alloy steel 20X23H18 and 08H18N10. Additionally the nanostructure plated with Fe-Ni-Cr alloy coating made possible to increase its microhardness. Fe-Ni alloy coating can be used as coatings for storage tanks of crude oil and Fe-Ni-Cr alloy coating can be recommended to harden the supporting structures of high-rise buildings, bridges, tunnels and underground structures.

• Periodical: Materials Science Forum (Volume 871)
• Pages: 16-21
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.871.16
• Online since: September 2016
• Authors: Irina Zhikhareva, Natalya Smirnova*, Vadim Schmidt, Oleg Vorobyev
• Keywords: Coatings, Innovative Materials, Materials for Reinforcement, Materials Science, Nanostructure, Nonconventional Methods, Phase Composition, Producing Characteristics

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