Influence of seawater salinity on corrosion of austenitic steel

• Autorzy: Starosta Robert

Identyfikatory

DOI

10.2478/kones-2019-0076

• Języki publikacji: EN

Abstrakty

EN

Due to the paramagnetic properties and the ability to passivation, for the production of hulls of some vessels (mainly warships), corrosion-resistant (stainless) steels with austenitic structure are used. This article describes the influence of seawater salinity on selected corrosion properties of high-alloy steel X5CrNi 18-10 (304). The average salinity of the seas is taken as 3.5% content of sodium chloride. Corrosion rate of the tested material was evaluated in an aqueous solution of sodium chloride was evaluated. The NaCl concentration in corrosive solutions was 0.7%, 1.4%, 2.1%, 2.8%, 3.5%, 4.2%. Corrosion tests were performed using the potentiodynamic method. The range of electrochemical potential changes was Ecorr ±150 mV. Corrosion rate was assessed on the basis of corrosion current density measurements. Corrosion potential values against the saturated calomel electrode were also determined. Based on the obtained measurement results and non-parametric significance tests carried out, a significant influence of seawater salinity on the value of corrosion current density and corrosion potential was found. The highest value of corrosion current density (jcorr), and thus the highest corrosion rate, was recorded for 3.5% NaCl solution. In the concentration range from 0.7 to 3.5% NaCl in solution, the corrosion rate of austenitic steel increases. A further increase in salinity of electrolyte results in the inhibition of corrosion rate of steel. There is almost a full negative, linear correlation between the proportion of sodium chloride in the corrosive solution and the value of corrosion potential. Along with the rise in the salinity of seawater, increase the electrochemical activity, and thus the corrosion susceptibility, thus the corrosion susceptibility, of the austenitic steel X5CrNi 18-10 was observed.

Słowa kluczowe

EN

austenitic steel; corrosion; potetiodynamic test; seawater

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2019
• Tom: Vol. 26, No. 3
• Strony: 219--225
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Starosta Robert

• Gdynia Maritime University, Faculty of Marine Engineering Department of Marine Maintenance Morska Street 81-87, 81-225 Gdynia, Poland tel.: [phone], fax: [phone]

Bibliografia

• [1] Charchalis, A., Starosta, R., Effect of finishing on the corrosion properties of flame sprayed Ni-5%Al and Ni-5%Al-Al2O3 coatings, Journal of KONES Powertrain and Transport, Vol. 21, No. 4, pp. 29-36, 2014.
• [2] Jurczak, W., Ochrona antykorozyjna morskich jednostek pływających, TTS Technika Transportu Szynowego, Vol. 23, No. 12, pp. 310-316, 2016.
• [3] Konieczny, J., Materiały konstrukcyjne okrętów, Kwartalnik Bellona, Vol. 658, No. 3, pp. 153-159, 2009.
• [4] Refait, Ph.,. Grolleau, A. M., Jeannin, M., Francois, E., Sabot, R., Localized corrosion of carbon steel in marine media: Galvanic coupling and heterogeneity of the corrosion product layer, Corrosion Science, Vol. 111, pp. 583-595, 2016.
• [5] Refait, Ph., Grolleau, A. M., Jeannin, M., Francois, E., Sabot, R., Corrosion of mild steel at the seawater/sediments interface: Mechanisms and kinetics, Corrosion Science, Vol. 130, pp. 76-84, 2018.
• [6] Rokosz, K., Hryniewicz, T., Dudek, Ł., Badania porównawcze odporności korozyjnej stali austenitycznej AISI 304L (EN 1.4307) stosowanej do przewozu wybranych płynów, Autobusy: technika, eksploatacja, systemy transportowe, No. 6, pp. 195-197, 2015.
• [7] Rokosz, K., Hryniewicz, T., Solecki, G., Dudek, Ł., Badania porównawcze odporności korozyjnej stali austenitycznej AISI 304L (EN 1.4307) po walcowaniu na zimno oraz po pasywowaniu w kwasie cytrynowym oraz EDTA, Autobusy: technika, eksploatacja, systemy transportowe, No. 6, pp. 198-201, 2015.
• [8] Starosta, R., The quantitative analysis of the effect of the porosity, the volume of fraction of reinforcing phase and the thermal spraying methods, on corrosion properties of composite coatings in marine environment, Journal of KONES, Vol. 23, No. 1, pp. 321-327, 2016.
• [9] Qu, Q., He, Y., Wang, L., Xu, H., Li, L., Chen, Y., Ding, Z., Corrosion behavior of cold rolled steel in artificial seawater in the presence of Bacillus subtillis C2, Corrosion Science Vol. 91, pp. 321-329, 2015.
• [10] Woźniak, P., Starosta, R., Corrosive properties of multi -groove pads hardfacing with the MIG method, Proceedings of 27th International Conference on Metallurgy and Materials, pp. 910-917, Brno 2018.

Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).