CORROSION PROPERTIES OF CRYOROLLED AA2219 FRICTION STIR WELDED JOINTS USING DIFFERENT TOOL PIN PROFILES

K. Kamal Babu, K. Panneerselvam, P. Sathiya, A. Noorul Haq, S. Sundarrajan, P. Mastanaiah and C. V. Srinivasa Murthy
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K. Kamal Babu: Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620015 Tamilnadu, India
K. Panneerselvam: Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620015 Tamilnadu, India
P. Sathiya: Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620015 Tamilnadu, India
A. Noorul Haq: Department of Production Engineering, National Institute of Technology, Tiruchirappalli-620015 Tamilnadu, India
S. Sundarrajan: #x2020;Former Director, National Institute of Technology, Tiruchirappalli-620015, Tamilnadu, India
P. Mastanaiah: #x2021;Directorate of Engineering, Defence Research and Development Laboratory, Hyderabad-500058, Telengana, India
C. V. Srinivasa Murthy: #x2021;Directorate of Engineering, Defence Research and Development Laboratory, Hyderabad-500058, Telengana, India

Surface Review and Letters (SRL), 2018, vol. 25, issue 03, 1-15

Abstract: The purpose of this paper is to present the corrosion behavior of the Cryorolled (CR) material and its Friction Stir Welded joints. Due to the thermal cycles of Friction Stir Welding (FSW) process, the corrosion behavior of the material gets affected. Here, the cryorolling process was carried out on AA2219 alloy and CR material was joined by FSW process using four different pin tool profiles such as cylindrical, threaded cylindrical, square and hexagonal pin. The FSW joints were analyzed by corrosion resistance with the help of potentiodynamic polarization test with 3.5% NaCl solution. From the analysis, it is found that CR AA2219 material exhibits good corrosion resistance compared to the base AA2219 material, and also a hexagonal pin profile FSW joint exhibits high corrosion resistance. Among the weld joints created by four different tools, the lowest corrosion resistance was found in the cylindrical pin tool FSW welds. Further, the corroded samples were investigated through metallurgical investigations like OM, Transmission Electron Microscopy (TEM), Energy-Dispersive X-ray Spectroscopy (EDX) and X-Ray Diffraction (XRD). It was found that the amount of dissolution of Al2Cu precipitate was present in the weld nugget. The amount of dissolution of Al2Cu precipitate is higher in the weld nugget produced by hexagonal pin tool. This is due to the enhancement of the corrosion resistance.

Keywords: CR AA2219; pin tool profiles; FSW; TEM; corrosion resistance; pit depth (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18500713

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