Effect of severe plastic deformation by ECAP on corrosion behaviour of aluminium alloy AA 7075

• Autorzy: Ilieva M. , Radev R

Identyfikatory

DOI

10.5604/01.3001.0009.7099

• Języki publikacji: EN

Abstrakty

EN

Purpose: The present study compares the corrosion behaviour of overaged AA 7075 before and after equal channel angular pressing ECAP in two media, containing chlorides, in order to answer the question how grain refinement of aluminium alloys influences their corrosion properties. Design/methodology/approach: The effect of equal channel angular pressing ECAP on corrosion behaviour of aluminium alloy AA 7075 was studied in two water solutions, containing chloride ions: 1) 0.01 M Na2SO4 with addition of 0.01%Cl-, and 2) 3g/l H2O2 and 57g/l NaCl. The changes in electrochemical characteristics, provoked by grain size refinement after equal channel angular pressing ECAP, were found using potentiodynamic polarisation. Steady state potential, corrosion potential, corrosion current density; breakdown (pitting) potential of overaged and deformed by equal channel angular pressing ECAP aluminium alloy AA 7075 were measured. Findings: In the environment with lower chloride concentration equal channel angular pressing ECAP process led to increase in pitting corrosion resistance and in the medium with higher chloride concentration - to decrease in pitting corrosion resistance. That way grain refinement does not demonstrate a uni-directional influence on corrosion resistance of AA 70775. Research limitations/implications: The results suggest the possibility for development of materials having the same chemical composition but with different corrosion resistance to different environments. Originality/value: The paper presents the corrosion behaviour of ultrafine-grained aluminium alloy AA 7075 and the influence of the chloride ions concentration in the corrosion medium on this behaviour.

Słowa kluczowe

EN

metallic alloy; aluminium alloy; corrosion; equal channel angular pressing

PL

stop metaliczny; stop aluminium; korozja; przeciskanie przez kanał kątowy

• Wydawca: International OCSCO World Press
• Czasopismo: Archives of Materials Science and Engineering
• Rocznik: 2016
• Tom: Vol. 81, nr 2
• Strony: 55--61
• Opis fizyczny: Bibliogr. 22 poz.

Twórcy

autor

Ilieva M.

• Department of Materials Science and Technology, Faculty of Mechanical and Manufacturing Engineering, University of Ruse, ul. Studentska 8, 7017 Ruse, Bulgaria

autor

Radev R

• Department of Materials Science and Technology, Faculty of Mechanical and Manufacturing Engineering, University of Ruse, ul. Studentska 8, 7017 Ruse, Bulgaria

Bibliografia

• [1] G.Z. Quan, Y.P. Mao, G.S. Li, W.Q. Lv, Y. Wang, J. Zhou, A characterization for the dynamic recrystallization kinetics of as-extruded 7075 aluminum alloy based on true stress-strain curves, Computer Materials Science 55 (2012) 65-72.
• [2] O. Senkov, F. Froes, V. Stolyarov, R. Valiev, J. Liu, Microstructure of Aluminum-Iron Alloys Subjected to Severe Plastic Deformation, Scripta Materialia 38 (1998) 1511-1516.
• [3] F.X. Zhao, X.C. Xu, H.Q. Liu, Y.L. Wang, Effect of annealing treatment on the microstructure and mechanical properties of ultrafine-grained aluminum, Materials Design 53 (2014) 262-268.
• [4] P.N. Rao, D. Singh, R. Jayaganthan, Mechanical properties and microstructural evolution of Al 6061 alloy processed by multidirectional forging at liquid nitrogen temperature, Materials Design 56 (2014) 97-104.
• [5] K. Ma, H. Wen, T. Hu, T.D. Topping, D. Isheim, D.N. Seidman, et al., Mechanical behaviour and strengthening mechanisms in ultrafine grain precipitation-strengthened aluminum alloy, Acta Materialia 62 (2014) 141-155.
• [6] R. Procházka, J. Džugan, M. Kövér, Miniature specimen tensile testing of AZ31 alloy processed by ECAP, Archives of Materials Science and Engineering 76/2 (2015) 134-139.
• [7] D. Song, A. MA, J. Jiang, P. Lin, D. Yang, Corrosion behaviour of ultra-fine grained industrial pure Al fabricated by ECAP, Transactions of Nonferrous Metals Society of China 19 (2009) 1065-1070.
• [8] K. Gopala Krishna, K. Sivaprasad, T.S.N. Sankara Narayanan, K.C. Hari Kumar, Localized corrosion of an ultrafine grained Al-4Zn-2Mg alloy produced by cryorolling, Corrosions Science 60 (2012) 82-89.
• [9] K.D. Ralston, N. Birbilis, C.H.J. Davies, Revealing the relationship between grain size and corrosion rate of metals, Scripta Materialia 63 (2010) 1201-1204.
• [10] S. Gollapudi, Grain size distribution effects on the corrosion behaviour of materials, Corrosions Science 62 (2012) 90-94.
• [11] R. Radev, V. Gagov, D. Gospodinov, E. Yankov, Metal forming simulation of ultrafine-grained commercial pure aluminum, Euromat 39 (2011) 1.
• [12] T. Liptáková, M. Lovíšek, B. Hadzima, S. Dundeková, Material parameters affecting degradation processes of Al-brasses in pipe systems, Archives of Materials Science and Engineering 76/1 (2015) 27-34.
• [13] M. Dziekońska, A. Ziębowicz, B. Ziębowicz, L.A. Dobrzański, Corrosion resistance of neodymium composite materials reinforced with metal powders, Archives of Materials Science and Engineering 58/2 (2012) 137-145.
• [14] L.A. Dobrzański, Ł. Reimann, C. Krawczyk, Effect of age hardening on corrosion resistance and hardness of CoCrMo alloys used in dental engineering, Archives of Materials Science and Engineering 57/1 (2012) 5-12.
• [15] M. Kciuk, A. Kurc-Lisiecka, The influence of heat treatment on structure, mechanical properties and corrosion resistance of steel X10CrNi18-8, Archives of Materials Science and Engineering 55/2 (2012) 62-69.
• [16] W. Walke, E. Hadasik, J. Przondziono, D. Kuc, I. Bednarczyk, G. Niewielski, Plasticity and corrosion resistance of magnesium alloy WE43, Archives of Materials Science and Engineering 51/1 (2011) 16-24.
• [17] W. Kajzer, M. Kaczmarek, A. Krauze, J. Marciniak, Surface modification and corrosion behaviour of Ni-Ti alloy used for urological implants, Archives of Materials Science and Engineering 28/9 (2007) 525-532.
• [18] C. Vargel, M. Jacques, M.P. Schmidt, Corrosion of Aluminium, Corrosions Aluminium 6 (2004) 81-109.
• [19] W. Lee, S. Pyun, Effects of sulphate ion addition on the pitting corrosion of pure aluminium in 0.01 M NaCl solution, Electrochemia Acta 45 (2000) 1901- 1910.
• [20] T.I. Wu, J.K. Wu, Effect of Sulfate Ions on Corrosion Inhibition of AA 7075 Aluminum Alloy in Sodium Chloride Solutions, Corrosion 51/3 (1995) 185-190.
• [21] M. Abdulstaar, M. Mhaede, L. Wagner, M. Wollmann, Corrosion behaviour of Al 1050 severely deformed by rotary swaging, Materials Design 57 (2014) 325-329.
• [22] E. Ghali, Corrosion resistance of aluminum and magnesium alloys: understanding, performance, and testing, Wiley, 2010.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).