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Home / Issues / № 3, 2017

Engineering

THE INFLUENCE OF NONSTATIONARY GAS FLOWS ON CORROSION RESISTANCE OF THE ELEMENTS OF THE CONSTRUCTION OF THE AIR VESSELS
Ivanov D.A.
Abstract: Аre in this work represented the results of investigating the influence of processing by the pulsatory subsonic gas flow on corrosion resistance of the structural metallic materials, utilized with the production of engines, in the aggressive media.

Keywords: structural metallic materials, corrosion resistance, heat treatment, gas flow.

Metallic elements of the construction of the air vessels, including of aircraft engines, such, as shafts, band regiments, valves, fastening and other they are frequently corroded, especially with interaction with the aggressive media, moreover it does not always succeed to in proper time reveal the centers of corrosion by the nondestructive methods of control with the maintenance; therefore the task of increasing their corrosion resistance is immediate.

Were carried out the studies of the influence of working by the pulsatory subsonic gas flow (gas-pulse working), it is earlier than shown high efficiency with an increase in the mechanical properties of metallic materials [1-5], by corrosion resistance of carbon and alloy structural steels in the aggressive media.

Medium-carbon alloy structural steels, such, as steel of 40Х in the high-strength state they are sensitive to the corrosion under the action of stresses.   For the evaluation of the influence of gas-pulse working on corrosion resistance of structural alloy steels in the high-strength state the models made from steel of 40Х quenched in the water from the temperature 860 °C, after which the part of the models it underwent leave at a temperature 200 °C, while remaining models were processed during 15 the minutes by the pulsatory subsonic air flow, the possessing frequency order 1130 Hz and sound pressure to 120 dB. Tests for corrosion resistance were accomplished by a way of sinking the models in 4%- ache the aqueous solution Of HCl on 20 twenty-four hours with the intermediate control of mass change through 5 twenty-four hours, the accompanied renovation of solution. The relative loss of the mass of models after 20 twenty-four hours comprised 2,8  % in the case of gas-pulse working instead of the low temperature tempering after hardening and 3,5  %  in the case of hardening with the subsequent low temperature tempering.

Also was investigated the influence of gas-pulse working on corrosion resistance of alloy structural steel of 12ХН, used for the production, the gears, it was finger and other critical machine parts, which work in the conditions of impact and alternating loads. In the models, subjected to gas-pulse working, as a result stay 4%- m the aqueous solution HCl with the duration 15 of twenty-four hours the loss of mass to 24% less than in the unprocessed models, which can be explained by the relaxation of the residual microstresses, which was present in the cold-rolled bar under the action of the mechanical waves, caused by the pulsations of the air flow, which leak ins to the model and testifies about the effectiveness of the application of the pulsatory subsonic gas flow for increasing corrosion resistance of alloy structural steels.

Plates from the aluminum alloy Of АМг6 were subjected to gas-pulse working with the frequency of the vibrations of the parameters of flow 900 Hz and the pulse air pressure 130 dB.  Blowout was achieved during 15 min. Corrosion tests were conducted in 40% the aqueous solution  HCl. The relative loss of the mass of models after 5 twenty-four hours comprised 12,8  % in the case of gas-pulse working and 64  %  without the working.

As the results of a study showed, the more prolonged the action of aggressive medium, the greater the degree to which the positive action of gas-pulse working on corrosion resistance is manifested.



References:
1. Ivanov D.A., Zasukhin O.N. Gas-impulsive Treatment of Constructional Materials Without Pre-Heating // DVIGATELESTROYENIYE. – St. Petersburg, 2010, №2, p. 20-22.

2. Ivanov D.A., Zasukhin O.N. Controlled Gas Explosion Technology Combined with Thermal Treatment Improves Strength of Construction Materials // DVIGATELESTROYENIYE. – St. Petersburg, 2012, №3, p. 12-15.

3. Ivanov D.A., Zasukhin O.N. Working by the pulsatory gas flow of high-strength and spring steels // DVIGATELESTROYENIYE. – St. Petersburg, 2014, №3, p. 34-36.

4. Bulychyov A.V., Ivanov, D.A. Effect of gas-impulsive treatment on structure, properties and stress of metal products. // Technologiya Metallov (Technology of metals). – M., 2013, №11, p. 30-33.

5. Ivanov D.A., Zasukhin O.N. Use of pulsating subsonic gas flow for improvement of service properties of metal products // Technologiya Metallov (Technology of metals). – M., 2015, №1, p. 34-38.



Bibliographic reference

Ivanov D.A. THE INFLUENCE OF NONSTATIONARY GAS FLOWS ON CORROSION RESISTANCE OF THE ELEMENTS OF THE CONSTRUCTION OF THE AIR VESSELS. International Journal Of Applied And Fundamental Research. – 2017. – № 3 –
URL: www.science-sd.com/471-25223 (19.09.2020).