Effect of Al additions and heat treatment on corrosion properties of Mg-Al based alloys

• Autorzy: Tański T. , Labisz K. , Dobrzyński L A
• Języki publikacji: EN

Abstrakty

EN

Purpose: In this paper there is presented the corrosion behavior of cast magnesium alloys in as cast state and after heat treatment. Design/methodology/approach: The following results concern scanning electron microscopy investigations in the SE as well BSE observation mode, for better phase contrast results, also qualitative microanalysis was applied for chemical composition investigations of the surface. Pitting corrosion resistance was carried out using the potentiodynamic electrochemical method (direct current), based on anodic polarisation curve. Based on the achieved anodic polarisation curves, using the Tefel extrapolation method near to the corrosion potential. the quantitative data were determined, which describe the electrochemical corrosion process of the investigated alloys: value of the corrosion potential E_cor (mV), polarisation resistance Rp (kΩ/cm²), corrosion current density i_cor (μA/cm²), corrosion rate Vp (mm/year) as well the mass loss Vc (g/m²). Findings: Surface morphology of the samples after corrosion test performed after and before heat treatment show irregular shaped pinholes and numerous cracks on the material surface layer. Research limitations/implications: The applied cooling rate and alloy additions seems to be a good compromise for properties and microstructures, nevertheless further tests should be carried out in order to examine different cooling rates and parameters of solution treatment process and aging process. Practical implications: Investigation results concerning the surface layer presents some interesting findings connected to the layer morphology, which can be of high interest for practical application for the reason of better layer quality as well as surface layer properties. Limitation of surface damage including irregular shaped pinholes and numerous cracks is of very high importance for decreasing the influence of pitting corrosion onto the surface layer corrosion resistance in very width range o applications. Originality/value: The value of this paper is to define the influence of heat treatment parameters and aluminium addition on corrosion resistance properties of magnesium-aluminium cast alloys.

Słowa kluczowe

EN

metallography; metallic alloys; corrosion resistance

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2011
• Tom: Vol. 44, nr 1
• Strony: 64--72
• Opis fizyczny: BIbliogr. 20 poz., rys. tab.

Twórcy

autor

Tański T.

• Division of Materials Processing Technology, Management, and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Labisz K.

• Division of Materials Processing Technology, Management, and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

autor

Dobrzyński L A

• Division of Materials Processing Technology, Management, and Computer Techniques in Materials Science, Institute of Engineering Materials and Biomaterials, Silesian University of Technology, ul. Konarskiego 18a, 44-100 Gliwice, Poland

Bibliografia

• [1] A. Fajkiel, P. Dudek, G. Sęk-Sas, Foundry engineering XXI c. Directions of metallurgy development and light alloys casting, Publishers Institute of Foundry Engineering, Cracow, 2002.
• [2] M. Kemal Kulekci, Magnesium and its alloys applications in automotive industry, Journal Advanced Manufacturing Technology 39 (2008) 851-865.
• [3] E.F. Horst, B.L. Mordike, Magnesium Technilogy, Metallurgy, Design Data, Application, Springer-Verlag, Berlin Heidelberg, 2006.
• [4] L.A. Dobrzański, T. Tański, Sz. Malara, M. Król, J. Domagała-Dubiel, Contemporary forming methods of the structure and properties of cast magnesium alloys, Magnesium Alloys - Design, Processing and Properties, edited by Frank Czerwinski, Publisher: InTech, 2011, 321-350.
• [5] T. Tański, L. A. Dobrzański, K. Labisz, Investigation of the microstructure characteristic of chosen magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 42/1-2 (2010) 94-101.
• [6] T. Tański, L.A. Dobrzański, R. Maniara, Microstructures of Mg-Al-Zn and Al-Si-Cu cast alloys, Journal of Achievements in Materials and Manufacturing Engineering 38/1 (2010) 64-71.
• [7] L.A. Dobrzański, T. Tański, Influence of aluminium content on behaviour of magnesium cast alloys in bentonite sand mould, Solid State Phenomena 147-149 (2009) 764-769.
• [8] B. Bronfin, N. Moscovitch, New magnesium alloys for transmission parts, Metal Science and Heat Treatment 48 (2006) 479-486.
• [9] T. Rzychoń, A. Kiełbus, Microstructure of WE43 casting magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 21 (2007) 31-34.
• [10] R. Alderliesten, C. Rans, R. Benedictus, The applicability of magnesium based Fibre Metal Laminates in aerospace structures, Composites Science and Technology 68 (2008) 2983-2993.
• [11] Z. Trojanová, Z. Drozd, P. Lukáč, A. Chatey, Mechanical properties of a squeeze cast Mg-Al.-Sr alloy, Archives of Materials Science and Engineering 29/2 (2008) 97-104.
• [12] B. Bronfin, N. Moscovitch, New magnesium alloys for transmission parts, Metal Science and Heat Treatment 48/11-12 (2006) 479-486.
• [13] Z. Jinshan, P. Lixia, D. Hongwei, L. Wei, X. Chunxiang, L. Binfeng, Effect of Mg-based spherical quasicrystals on microstructure and mechanical properties of AZ91 alloys, Journal of Alloys and Compounds 453/1-2 (2008) 309-315.
• [14] K. Jer-Liang, S. Sumio, H. Su-Hai, Y. Jun, Investigating the characteristics of AZ61 magnesium alloy on the hot and semi-solid compression test, The International Journal of Advanced Manufacturing Technology 29/7-8 (2006) 670-677.
• [15] B. M. Kannan, V.S. Raja, Enhancing stress corrosion cracking resistance in Al-Zn-Mg-Cu-Zr alloy through inhibiting recrystallization, Engineering Fracture Mechanics 77/2 (2010) 249-256.
• [16] L. Yaohui, F. Shijie, S. Yulai, Z. Dawei, Z. Lina, L, Chunfang, W. Qiang, Evaluating the improvement of corrosion residual strength by adding 1.0wt.% yttrium into an AZ91D magnesium alloy, Materials Characterization 61/6 (2010) 674-682.
• [17] M. B. Kannan, Influence of microstructure on the in-vitro degradation behaviour of magnesium alloys, Materials Letters 64/6 (2010) 739-742.
• [18] C. Yan, R.X. Bai, Y.T. Gu, W.J. Ma, Investigation on mechanical behaviour of AM60 magnesium alloys, Journal of Achievements in Materials and Manufacturing Engineering 31/2 (2008) 398-401.
• [19] M. Kciuk, A. Kurc, J. Szewczenko, Structure and corrosion resistance of aluminium AlMg2.5; AlMg5Mn and AlZn5Mg1 alloys, Journal of Achievements in Materials and Manufacturing Engineering 41/1-2 (2010) 74-81.
• [20] W. Kajzer, A. Krauze, W. Walke, J. Marciniak, Corrosion behaviour of AISI 316L steel in artificial body fluids, Journal of Achievements in Materials and Manufacturing Engineering 31/2 (2008) 247-253.