Electrochemical Corrosion of Magnesium Alloy AZ31 in NaCl Solutions After Rolling
The purpose of this study was to evaluate the electrochemical corrosion resistance of magnesium alloy AZ31 after rolling. Corrosion tests were conducted in NaCl solutions containing various concentrations of chloride ions (0.01–2 M NaCl). Potentiodynamic tests were conducted to obtain anodic polarisation curves. Immersion tests were conducted over periods of 1–5 days. The microstructure of AZ31 was examined by scanning electron microscopy (SEM) after the immersion tests. Electrochemical impedance spectroscopy (EIS) was applied to evaluate the electrochemical phenomena occurring at the surface of the tested alloy. Geometrical features of the AZ31 alloy surface were also measured after the corrosion tests. The results of all of the tests carried out demonstrate a clear deterioration in the corrosion properties of magnesium alloy AZ31 with the increase in the molar concentration of the NaCl solution. Irrespective of the molar concentration of the NaCl solution, pitting corrosion on the surface of the tested alloy was observed.
KeywordsMagnesium Alloy AZ31 Rolling Electrochemical corrosion SEM EIS
The financial support of Structural Funds in the Operational Programme Innovative Economy (IE OP) financed by the European Regional Development Fund—Project “Modern material technologies in aerospace industry”, No. POIG.0101.02-00-015/08 is gratefully acknowledged.
- 1.Hadasik, E.: Tests of metal plasticity. Monograph, Printing House of the Silesian University of Technology, Gliwice (2008, in Polish)Google Scholar
- 2.Kawalla, R.: Magnesium and magnesium alloys. Monograph: Metal processing. Plasticity and structure, Printing House of the Silesian University of Technology, Gliwice (2006, in Polish)Google Scholar
- 3.Kiełbus, A., Kuc, D., Rzychoń, T.: Magnesium alloys’ microstructure, properties and application. Monograph. Modern metallic materials - presence and future, Department of Materials Engineering and Metallurgy, Katowice (2009, in Polish)Google Scholar
- 4.Brooks, C.R.: Heat treatment, structure and properties of nonferrous alloys. ASM Internationale, Metals Park, Ohio (1984)Google Scholar
- 10.Čížek, L., Greger, M., Dobrzański, L.A., Juřička, I., Kocich, R., Pawlica, L.: Structure and properties of alloys of the Mg-Al-Zn system. J. Achievements Mater. Manuf. Eng. 32(2), 179–187 (2009)Google Scholar
- 14.Walke, W., Hadasik, E., Przondziono, J., Kuc, D., Bednarczyk, I., Niewielski, G.: Plasticity and corrosion resistance of magnesium alloy WE43. Arch. Mater. Sci. Eng. 51(1), 16–24 (2011)Google Scholar
- 17.Gontarz, A., Pater, Z., Drozdowski, K.: Hammer forging process of lever drop forging from AZ31 magnesium alloy. Metalurgija 52(3), 359–362 (2013)Google Scholar
- 21.Amira, S., Dubé, D., Tremblay, R., Ghali, E.: Influence of the microstructure on the corrosion behavior of AXJ530 magnesium alloy in 3.5% NaCl solution. Mater. Charact. 59(10), 1508–1517 (2008)Google Scholar
- 24.Rzychoń, T., Michalska, J., Kiełbus, A.: Effect of heat treatment on corrosion resistance of WE54 alloy. J. Achievements Mater. Manuf. Eng. 20(1–2), 191–194 (2007)Google Scholar
- 25.Przondziono, J., Walke, W., Hadasik, E., Jasiñski, B.: Electrochemical corrosion of magnesium alloy AZ31 in NaCl solutions. Acta Metallurgica Slovaca 16(4), 254–260 (2010)Google Scholar
- 30.Przondziono, J., Walke, W., Hadasik, E., Szala, J., Wieczorek, J.: Corrosion resistance tests of magnesium alloy WE43 after extrusion. Metalurgija 52(2), 242–246 (2013)Google Scholar
- 31.Basiaga, M., Paszenda, Z., Walke, W.: Study of electrochemical properties of carbon coatings used in medical devices. Electr. Rev. 87(12B), 12–15 (2012)Google Scholar