Indian Welding Journal

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Determining the Minimum Corrosion Conditions for the Stir Zone of Friction Stir Welded AA6061 Aluminium Alloy Joints


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1 Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India
     

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Joining of aluminium is commonly done in automobile industries because of its light weight and high specific strength. In recent days, friction stir welding (FSW) is widely preferred to join aluminium than fusion-welding processes. In this joint, grains are very fine in stir zone (SZ) compared to the other zones. Due to this extreme change in the microstructure at the SZ, the mechanical properties (tensile strength, hardness, etc) of the FSW joints are superior but the corrosion resistance of SZ is very poor. The concentration of chloride ion, exposure time and pH value are reported to be the more influencing corrosion test parameters. The present work aims to determine combination of these pitting corrosion test parameters to attain a minimum corrosion rate at the SZ of friction stir welded aluminium alloy, AA6061-T6, by response surface methodology (RSM). From the results obtained, chloride ion concentration is reportedly had higher effect on corrosion rate than the other two parameters considered.

Keywords

AA6061 Aluminium Alloy, Stir Zone, Response Surface Methodology, Pitting Corrosion Test.
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  • Grard C (2004); Introduction to Aluminium and Its Alloys, Corrosion of Aluminium.

  • Dashwood RJ and Grimes R (2010); Structural Materials: Aluminum and Its Alloys - Properties', in Encyclopedia of Aerospace Engineering. Chichester, UK: John Wiley {&} Sons, Ltd, 262.

  • Totten GE, MacKenzie DS (eds) (2003); Handbook of Aluminum. New York; Basel: M. Dekker.

  • Baboian R (ed.) (1995); Corrosion Tests and Standards: Application and Interpretation. Philadelphia, PA: ASTM ({ASTM} Manual Series).

  • Mathers G (2002); The Welding of Aluminium and its Alloys, The Welding of Aluminium and its Alloys. Boca Raton: CRC Press.

  • Cornu J, Weston J, Greener S, Cornu, J (2013); Fundamentals of fusion welding technology. Berlin: Springer (Advanced Welding Systems).

  • Kumar DA, Biswas P, Tikader S, Mahapatra, MM Mandal NR (2013); A study on friction stir welding of 12mm thick aluminum alloy plates, Journal of Marine Science and Application, 12(4), 493-499.

  • Thomas WM, Nicholas ED, Needham JC, Murch, MG, Temple-Smith P and Dawes, CJ (1995); Friction welding. Google Patents.

  • Amini K, Gharavi F (2016); Influence of welding speed on corrosion behaviour of friction stir welded AA5086 aluminium alloy, Journal of Central South University, 23(6), 1301-1311.

  • Ezuber H, El-Houd A, El-Shawesh F (2008); A study on the corrosion behavior of aluminum alloys in seawater, Materials & Design, 29(4), 801-805.

  • Stansbury EE Buchanan RA (2000); Fundamentals of electrochemical corrosion. Materials Park, OH: ASM International.

  • Garcia SJ, Muster TH, Ozkanat O, Sherman N, Hughes AE, Terryn H, de Wit JHW, Mol JMC (2010); The influence of pH on corrosion inhibitor selection for 2024-T3 aluminium alloy assessed by high-throughput multi-electrode and potentiodynamic testing, Electrochimica Acta, 55(7), 2457-2465.

  • Curioni M (2014); The behaviour of magnesium during free corrosion and potentiodynamic polarization investigated by real-time hydrogen measurement and optical imaging, Electrochimica Acta, 120, 284-292.

  • Zhao M-C, Liu M, Song G-L, Atrens A (2008); Influence of pH and chloride ion concentration on the corrosion of Mg alloy ZE41, Corrosion Science, 50(11), 3168-3178.

  • Jayaraj RK, Malarvizhi S, Balasubramanian V (2016); Predicting pitting corrosion rate of weld nugget (stir zone) of friction stir welded dissimilar joints of aluminium -magnesium alloys, Journal of Manufacturing Engineering, 11(4), 178-183.

  • Jayaraj RK, Malarvizhi S and Balasubramanian V (2017); Determination of minimum corrosion conditions for the stir zone of friction stir welded AZ31B magnesium alloy, Manufacturing Technology Today, 16(4), 12-21.

  • Porciuncula CB, Marcilio NR, Tessaro IC, Gerchmann M (2012); Production of hydrogen in the reaction between aluminum and water in the presence of NaOH and KOH, Brazilian Journal of Chemical Engineering, 29(2), 337-348.


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  • Determining the Minimum Corrosion Conditions for the Stir Zone of Friction Stir Welded AA6061 Aluminium Alloy Joints

Abstract Views: 411  |  PDF Views: 8

Authors

R. Kamal Jayaraj
Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India
S. Malarvizhi
Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India
V. Balasubramanian
Centre for Materials Joining & Research (CEMAJOR), Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar-608002, Tamil Nadu, India

Abstract


Joining of aluminium is commonly done in automobile industries because of its light weight and high specific strength. In recent days, friction stir welding (FSW) is widely preferred to join aluminium than fusion-welding processes. In this joint, grains are very fine in stir zone (SZ) compared to the other zones. Due to this extreme change in the microstructure at the SZ, the mechanical properties (tensile strength, hardness, etc) of the FSW joints are superior but the corrosion resistance of SZ is very poor. The concentration of chloride ion, exposure time and pH value are reported to be the more influencing corrosion test parameters. The present work aims to determine combination of these pitting corrosion test parameters to attain a minimum corrosion rate at the SZ of friction stir welded aluminium alloy, AA6061-T6, by response surface methodology (RSM). From the results obtained, chloride ion concentration is reportedly had higher effect on corrosion rate than the other two parameters considered.

Keywords


AA6061 Aluminium Alloy, Stir Zone, Response Surface Methodology, Pitting Corrosion Test.

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DOI: https://doi.org/10.22486/iwj%2F2018%2Fv51%2Fi1%2F166442