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Salt fog corrosion behavior of friction stir welded AA2014-T651 aluminum alloy

  • Kollapuri Thamilarasan , Sadayan Rajendraboopathy , Gankidi Madhusudhan Reddy , Tadivaka Srinivasa Rao , Sajja Rama and Koteswara Rao
Published/Copyright: December 15, 2016
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Materials Testing
From the journal Materials Testing Volume 58 Issue 11-12

Abstract

High strength aluminum alloys of type AA2014 are used in aerospace applications. This alloy is considered unweldable using fusion welding processes. Friction stir welding being a solid state process has been proved to be a suitable process for obtaining sound welds of these materials. In the current study, 8 mm thick rolled AA2014-T651 aluminum alloy plates were joined using friction stir welding. The corrosion behavior of base material and friction stir welds was investigated using the salt fog test (ASTM B117). The corrosion resistance of the welds and parent material in the basic solution was found to be better than that in acidic and neutral solutions. It was also found that the corrosion rate increases with increase in time of exposure. It has been observed that corrosion attack is greater in the weld region than in the parent material and within the weld, heat affected zone has been found to be more susceptible to corrosion compared to the weld nugget and thermomechanically affected zone regions. Transmission electron microscopy studies revealed coarser precipitates and precipitate-free zones in the heat affected zone which are concluded to be the reasons for more susceptibility to corrosion.

Kurzfassung

Hochfeste Aluminiumlegierungen des Typs AA2014 werden in der Raumfahrt verwendet. Dieser Legierungstyp gilt als nicht schweißbar mittels Schmelzschweißprozessen. Das Rührreibschweißen ist ein Prozess im festen Zustand und hat sich als geeignet erwiesen, um einwandfreie Schweißungen dieser Werkstoffe herzustellen. In der diesem Beitrag zugrunde liegenden Studie wurden 8 mm dicke gewalzte Bleche der Aluminiumlegierung AA2014-T651 mittels Rührreibschweißens verbunden. Das Korrosionsverhalten des Grundwerkstoffs und der Rührreibschweißungen wurde mittels des Salzsprühtests (ASTM B117) untersucht. Der Korrosionswiderstand der Schweißungen und des Grundwerkstoffs stellte sich in einer basischen Lösung als höher gegenüber einer neutralen oder sauren Lösung heraus. Es wurde auch festgestellt, dass die Korrosionsrate mit der Expositionszeit zunimmt. Darüber hinaus wurde beobachtet, dass der Korrosionsangriff in der Schweißnahtregion größer ist als im Grundwerkstoff und innerhalb der Schweißnaht wurde bemerkt, dass die Wärmeeinflusszone korrosionsanfälliger im Vergleich zum Schweißgut und den thermomechanisch beeinflussten Zonen ist. Transmissionselektronenmikroskopische Untersuchungen ergaben gröbere Ausscheidungen und ausscheidungsfreie Zonen in der Wärmeeinflusszone, was als Grund für die größere Korrosionsanfälligkeit angesehen wird.

*Correspondence Address, Associate Prof. K. Thamilarasan, Department of Mechanical Engineering, New Prince Shri Bavani College of Engineering & Technology, Chennai, 600 073, India, E-mail:

Associate Prof. K. Thamilarasan, born in 1976, completed his M. E. in Computer Integrated Manufacturing at College of Engineering, Guindy, Anna University, Chennai, India. He has around 18 years of professional experience in teaching and research. Currently, he is working as Associate Professor of Mechanical Engineering at New Prince Shri Bavani College of Engineering & Technology, Chennai, India.

Prof. Dr. S. Rajendraboopathy, born in 1962, received his PhD in Mechanical Engineering from Anna University, Chennai, India in 2002 and is presently working as Professor in the Department of Mechanical Engineering, Anna University, Chennai, India.

Dr. G. Madhusudhan Reddy, born in 1964, received his PhD in Metallurgical and Materials Engineering from IIT Madras, Chennai, India in 1999 and is presently working as Scientist H in the Metal Joining Group, Defense Metallurgical Research Laboratory, Hyderabad, India.

Prof. Dr. T. Srinivasa Rao, born in 1978, received his PhD in Mechanical Engineering from Anna University, Chennai, India in 2016 and is presently working as Professor in the Department of Mechanical Engineering, KKR and KSR Institute of Technology and Sciences, Guntur, India.

Prof. Dr. S. R. Koteswara Rao, born in 1966, received his PhD in Metallurgical and Materials Engineering from IIT Madras, Chennai, India in 2005 and is presently working as Professor in the Department of Mechanical Engineering, SSN College of Engineering, Chennai, India.

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Published Online: 2016-12-15
Published in Print: 2016-11-16

© 2016, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Tribologie – 50 Jahre interdisziplinäre Reibungs- und Verschleißforschung
  5. Synthetic method to investigate self-loosening of suspension fasteners considering nonlinear tire characteristics at the adhesion limit
  6. Salt fog corrosion behavior of friction stir welded AA2014-T651 aluminum alloy
  7. Improving the performance of cementless knee prosthesis coating through functionally graded material
  8. Processing and characterization of graphene nano-platelet (GNP) reinforced aluminum matrix composites
  9. Effect of thickness on structural, corrosion and mechanical properties of a thin ZrN film deposited by medium frequency (MF) reactive sputtering
  10. Influence of welding parameters on the fracture of PE300 polyethylene friction stir spot welds
  11. Weldability of 5754 aluminum alloy using a pulsed Nd:YAG micro scale laser
  12. Improving the visibility of phase gratings for Talbot-Lau X-ray imaging
  13. Vergleich von zerstörungsfreien und zerstörenden Prüfungen dünner Strukturklebungen in der Umformtechnik
  14. Fracture behavior of an empty hole using the digital laser dynamic caustic method under directional controlled blasting
  15. Effect of ZrSiO4 on the corrosion behavior of MgO-FeAl2O4 composite refractory materials
  16. Time dependent hardness and residual stress reduction in a shot-peened aluminum alloy 2024-T351
  17. A validation experiment on indium recovery by electrowinning of aqueous electrolytes: Optimization of electrolyte composition
  18. Qualitätssicherung von Fahrzeug-rädern aus Leichtmetallguss
  19. Comparison of electrical energy consumption for different material processing procedures
https://doi.org/10.3139/120.110941

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. Tribologie – 50 Jahre interdisziplinäre Reibungs- und Verschleißforschung
  5. Synthetic method to investigate self-loosening of suspension fasteners considering nonlinear tire characteristics at the adhesion limit
  6. Salt fog corrosion behavior of friction stir welded AA2014-T651 aluminum alloy
  7. Improving the performance of cementless knee prosthesis coating through functionally graded material
  8. Processing and characterization of graphene nano-platelet (GNP) reinforced aluminum matrix composites
  9. Effect of thickness on structural, corrosion and mechanical properties of a thin ZrN film deposited by medium frequency (MF) reactive sputtering
  10. Influence of welding parameters on the fracture of PE300 polyethylene friction stir spot welds
  11. Weldability of 5754 aluminum alloy using a pulsed Nd:YAG micro scale laser
  12. Improving the visibility of phase gratings for Talbot-Lau X-ray imaging
  13. Vergleich von zerstörungsfreien und zerstörenden Prüfungen dünner Strukturklebungen in der Umformtechnik
  14. Fracture behavior of an empty hole using the digital laser dynamic caustic method under directional controlled blasting
  15. Effect of ZrSiO4 on the corrosion behavior of MgO-FeAl2O4 composite refractory materials
  16. Time dependent hardness and residual stress reduction in a shot-peened aluminum alloy 2024-T351
  17. A validation experiment on indium recovery by electrowinning of aqueous electrolytes: Optimization of electrolyte composition
  18. Qualitätssicherung von Fahrzeug-rädern aus Leichtmetallguss
  19. Comparison of electrical energy consumption for different material processing procedures
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