Corrosion Behavior Characterization of the Nugget Zone in Copper/Brass Metals of Dissimilar Friction Stir Welded Lap Joints
الموضوعات :kamran amini 1 , Farhad Gharavi 2
1 - Young Researchers and Elite Club, Tiran Branch,
Islamic Azad University, Isfahan, Iran
Center for Advanced Engineering Research, Majlesi Branch,
Islamic Azad University, Isfahan, Iran
2 - Department of Materials Engineering,
Sirjan Branch, Islamic Azad University, Sirjan, Iran
الکلمات المفتاحية: Copper, Friction Stir Welding, Brass, Electrochemical behavior, Lap joint,
ملخص المقالة :
The electrochemical behavior of the weld nugget zone (WNZ) in copper-brass plates was studied in this paper. These plates were welded by the friction stir lap welding method in 1M NaCl solution at low heating input (450 rpm-25 mm/min ) and high heating input (710 rpm-16 mm/min) by using the electrochemical impedance spectroscopy (EIS) and Tafel polarization at ambient temperature. The morphology of nugget zone corroded surfaces was analyzed by SEM (scanning electron microscopy) technique. The welding process appeared to decrease the corrosion resistance of the welded nugget regions through increasing the welding heat input. The results from EIS measurements presented the welded joints of NZ which showed higher and lower values respectively than brass and copper. Due to changing of microstructural of weld nugget zone during welding process, the Icorr of nugget zone enhances with increasing welding heat input. In fact, the surface corrosion morphology analysis revealed that the surface of welded sample by high heating input was shielded with a roughly porous corrosion layer rather than the surface of the welded sample at low heating input
[1] Cowie, J. G., Kundig, K. J. A., “Copper and Copper Alloysˮ, In: Myer K (ed.) Handbook of Mechanical Engineers. Wiley Inter-Science., 2006, pp. 117- 220.
[2] Simonović, A. T., Radovanović, M. B., Petrović, M. B., Antonijević, M. M., and Milić, S. M., “Effect of Purine on Brass Behavior in the Neutral and Alkaline Sulphate Solutionsˮ, International Journal of Electrochemical Science, Vol. 7, 2012, pp.11796 – 11810.
[3] Erdem M., “Examining the Structure and Mechanical Properties of Copper-Brass Plates Joined by Friction Stir Weldingˮ, International Journal of Advanced Manufacturing Technology, Vol. 76, 2015, pp. 1583–1592.
[4] Huang, Y. X., Dong, S. S., Zhou, L., Zhou, W. L., Feng, J.C., and He, W. X., “The Effect of Rotational Speed on the Microstructure and Mechanical Properties of Dissimilar Friction Stir-Welded Copper/Brass Metalsˮ, International Journal of Advanced Manufacturing Technology, DOI 10.1007/s00170-015-7792-9.
[5] Murch, M. G., Templesmith, P., Dawes, C. J., Thomas, W. M., Nicholas, E. D., and Need Ham, J. C., “Friction stir weldingˮ, International Patent Application, 1991, No. PCT/GB92102203 and GB Patent.
[6] Meran, C., “The Joint Properties of Brass Plates Caused by Friction Stir Weldingˮ, Material and Design., Vol. 27, 2006, pp. 719–726.
[7] Gharavi, F., Matori, K. A., Yunus, R., and Othman, N. K., “Study the Nugget Zone Corrosion Behavior in the Friction Stir Welded Lap Joints of 6061-T6 Aluminum Alloyˮ, Mater. Rese., Vol. 17, No. 6, 2014, PP. 1563-1574.
[8] Amini, K., Gharavi, F., “The Impact of Welding Speed on the Corrosion Behavior of Friction Stir Welded AA5086 Aluminium Alloyˮ, Journal of Central South University, Vol. 23, 2016, pp. 1301-1311.
[9] Tan, K. L., Hsieh, A. K., Feng, Y., Siow, K. S., and Teo, W. K., “The Copper Corrosion Mechanisms and Products of in Aqueous Solutions at Various pH Valuesˮ, Corrosion., Vol. 53, No. 5, 1997, pp. 389-398.
[10] Ahmed, T. M., Tromans, D., and Alfantazi, A. M., “The Corrosion Behavior of Copper Alloys in Chloride Mediaˮ, Mater. Des., Vol. 30, 2009, pp. 2425–2430.
[11] Kilincceker, G., Erbil, M., “The Effect of Phosphate Ions on the Electrochemical Behavior of Brass in Sulphate Solutions”, Material Chemistry and Physics., Vol. 119, 2010, pp. 30–39.
[12] Burstein, G. T., “Tafel’s Equation: One hundred years (1905–2005)ˮ, Corrosion Science, Vol. 47, 2005, pp. 2858.
[13] Tuthill, A. H., Todd, B., and Oldfield, J., “Study the Experiments with Copper Alloy Tubing Water Boxes and Pipes in the MSF Desalination Plantsˮ, International Congress on Desalination and Water Re-use, 1997, pp. 251-270.
[14] Griesss, J. C., Bacarella, A. L., “Anodic Dissolution of Cu in Flowing NaCl Solutions between 25 and 175 °Cˮ, Journal of Electrochemical Society, Vol. 120, 1973, pp. 459–65.
[15] Tromans, D., Silva, J. C., “Copper Behavior in Acidic Sulfate Solution: Compared with Acidic Chloride Solution, Corrosion, Vol. 53, 1997, pp. 171–8.
[16] Tromans, D., Sun, R., “Anodic Polarization Behavior of Copper in Aqueous Chloride/ Benzotriazole solutions, Journal of Electrochemical Society., Vol. 138, 1991, pp. 3235–55.
[17] Matthews, A., Liu, C., Bi, Q., and Leyland, A., “The Electrochemical Impedance Spectroscopic Study of the Corrosion Behavior of PVD Coated Steels in 0.5 N NaCl Aqueous Solution: Part I. Establishment of Equivalent Circuits for EIS Data Modeling, Corrosion Science, Vol. 45, 2003, pp. 1243–1256.
