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Corrosion Behavior of Aluminium Alloy Aa2219-T87 Welded Plates in Sea Water


Affiliations
1 Department of Chemistry, Sathyabama University, Jeppiaar Nagar, Chennai-600119, India
2 Materials Characterization Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Trivandrum–695022, India
 

The corrosion behavior of aluminium alloy AA2219-T87 welded plates in seawater was investigated using potentiodynamic polarization and EIS techniques. The potentiodynamic polarization curves reveal that heat affected zone (HAZ) is more prone to corrosion than weld zone (WZ) and base metal (BM). This is further confirmed by EIS which showed a decrease of Rct-. The microstructures of AA2219-T87 were made by optical microscopy and SEM. The higher environmental susceptibility of HAZ as compared to BM is caused by the dissolution and segregation of CuAl2 intermetallic particles along the grain boundaries. The corrosion rate of WZ is due to the presence of micro pores and copper rich areas in α-matrix.

Keywords

Aluminium, EIS, SEM, Heat Affected Zone
User

  • In ‘Aluminium standards and data’, (1982)159, Washington DC, USA. The Aluminium Association.

  • Standard practice for conventions applicable to electrochemical measurements in corrosion testing, ASTM G3-89 (2004)

  • Balasrinivasan P, Arora K S, Dietzel W, Pandey S, Schaper M K, Characterization of microstructure, mechanical properties and corrosion behavior of an AA2219 friction stir weldment, J Alloys Compd, Vol.492, No.1-2 (2010), pp.631-637.

  • Birbilis N, and Buchheit R G, Electrochemical characteristics of intermetallic phases in aluminum alloys: An experimental survey and discussion, J. Electrochem. Soc., Vol.152, No.4 (2005)B140-B151.

  • Cao G and Kou S, Friction stir welding of 2219 aluminum: Behavior of θ (Al2Cu) particles, Weld. J., Vol.84, No.1 (2005), pp.1–7.

  • Frankel G S, Xia Z, Localised corrosion and stress corrosion cracking resistance of friction stir welded aluminium alloy 5454, Corrosion, Vol.55, No.2 (1999), pp.139-150.

  • Ghosh B R, Gupta R K, Biju S, Sinha P P, Modified welding technique of a hypo-eutectic Al-Cu alloy for higher mechanical properties, J. Solid Mechs. and Mater. Engg., Vol.1, No.4 (2007), pp.469-479.

  • Hatch J E (Ed.), Aluminum: Properties and physical metallurgy, ASM, Metals Park, OH (1984)242-319.

  • Gnecco.F, Beccaria.A.M., Corrosion behavior of Al-Si/Sic composite in sea water, British Corr. J., Vol.34, No.1 (1999), pp.57-62.

  • Holingsworth E H and Hunsicker H Y, Corrosion of aluminium and aluminium alloys, ASM Hand Book, Vol.13 (2001), pp.583-609.

  • Huang C, and Kou, Liquation cracking in full penetration Al-Cu Welds, Weld. J. 83, (2) (2004), pp.50-58.

  • Keddam M, Kuntz C, Takenouti H, Schustert D, Zuili D, Exfoliation corrosion of aluminium alloys examined by electrode impedance Electrochim. Acta, Vol.42, No1 (1997), pp.87-97.

  • Koteswara Rao S R, Madhusudhan Reddy G, Srinivasa Rao K, Kamaraj M, Prasad Rao K, Reasons for superior mechanical and corrosion properties of 2219 aluminum alloy electron beam welds, Mater. Charac., Vol.55, No.4-5 (2005), pp.345-354.

  • Kuznicka B, Podrlez M - Radziszewska, Correlation between microstructural evolution in heat affected zone and corrosion behaviour of Al-Cu alloy, Archi. Metall. and Mater., Vol.53, No.3 (2008), pp.933-938.

  • Little D A, B J Connolly and Scully J R, An electrochemical framework to explain the intergranular stress corrosion behavior in two Al–Cu–Mg–Ag alloys as a function of aging Corros. Sci. 49 (2) (2007)347-372.

  • Lumsden J B, Mahoney M W, Pollock G, Rhodes C G, “Intergranular corrosion following friction stir welding of aluminum alloy 7075-T651”, Corrosion 5 (1999)1127-1135

  • Lumsden J, Pollock G, Mahoney M, Proc. friction stir welding and processing II, TMS, Warrendale, PA, USA, (2003)99.

  • Lunarska E, Trela E, and Szklarska-smialowska Z, Pitting corrosion of powder metallurgy AlZnMg alloys, Corrosion, Vol.43, No.4 (1987), pp.219-228.

  • Meletis E I and Weiji Huang , The role of the T1 phase in the pre-exposure and hydrogen embrittlement of Al-Li-Cu alloys, Mater. Sci. and Engg. A, Vol.148, No.2 (1991), pp.197-209.

  • Metals Hand Book, Properties of Aluminium and Aluminium alloys, 10th Ed. Vol.2 (1990), pp.79-80.

  • Paglia C S, Buchheit R G, Microstructure, microchemistry and environmental cracking susceptibility of friction stir welded 2219-T87, Mater. Sci. and Engg. A, Vol.429 (2006), pp.107-114.

  • Paglia C S, Carroll M C, Pitts B C, Reynolds A P, Buchheit R G, Strength, corrosion and environmentally assisted cracking of 7075-T6 friction stir weld, Mater. Sci. Forum, Vol.396 (2002), pp.1677-1684.

  • Paglia C S, Ungaro L M, Pitts B C, Carroll M C, Reynolds A P, Buchheit R G, Proc. friction stir welding and processing II, TMS, Warrendale, PA, USA, (2003)65.

  • Ramgopal T, Gouma P I and Frankel G S, Role of grain boundary precipitates and SDZ on the intergranular corrosion of aluminum alloy AA7150, Corrosion, Vol.58 (2002), pp.687-697.

  • Robinson M J Mathematical modelling of exfoliation corrosion in high strength aluminium Alloys, Corros. Sci., Vol.22, No.8 (1982), pp.775-790.

  • Rossana Grilli, Mark A. Baker, James E. Castle, Barrie Dunn, John F. Watts, Corrosion behavior of a 2219 aluminium alloy treated with a chromate conversion coating exposed to 3.5% NaCl solution, Corros.Sci., Vol.54, No.4 (2011), pp.1214-1223

  • Shibayan Roy, B R Nataraj, Satyam Suwas, S. Kumar, K. Chattopadhyay, Accumulative roll bonding of aluminium alloy 2219/5086 laminates: Microstructural evoluation and tensile properties, Mater. & Desi., (36) (2012)529-539.

  • Valérie Guillaumin and Georges Mankowski, Localized corrosion of 2024 T351 aluminium alloy in chloride media, Corros. Sci. Vol.41, No.3 (1998), pp.421-438.

  • Venkata Narayana G, Sharma V M J, Diwahar V, Sreekumar K, Prasad R C, Fracture behaviour of aluminium alloy 2219–T87 welded plates, Sci. and Tech. of Weld. and Joining, Vol.9, No2 (2004), pp.121-130.

  • Venugopal A, Sreekumar K, Raja VS, Effect of repair welding on electrochemical corrosion and stress corrosion cracking behavior of TIG welded AA2219 aluminium alloy in 3.5% NaCl Solution, Metall Mater Trans A, Vol.41, No.12 (2010), pp.3151-3160.

  • Wang B B, Wang Y Z, Han W, Ke W, Atmospheric corrosion of aluminium alloy 2024-T3 exposed to salt lake environment in Western China, Corros. Sci., (59) (2012)63-70

  • Williams Stewart W, Rajan Ambat, Debbie Price, Manthana Jariyaboon, Alison Davenport J, Andrew Wescott, Laser treatment method for improvement of the corrosion resistance of friction stir welds, Mater. Sci. Forum. Vol.426 (2003), pp.2855-2860.

  • Wislei R. Osório, José E. Spinelli, Alexandre P. Boeira, Célia M. Freire, Amauri Garcia, The influences of macro segregation, intermetallic particles, and dendritic spacing on the electrochemical behavior of hypoeutectic Al-Cu alloys, Micros. Res. and Techniq., Vol.70, No.11 (2002), pp.928–937.

  • Wislei R. Osório , José E. Spinelli, Alexandre P.Boeia, Celia M.Freire, Amauri Garcia, The roles of Al2Cu and of dendritic refinement on surface corrosion resistance of hypoeutectic Al–Cu alloys immersed in H2SO4, J. Alloys and Comp., Vol.443, No.1-2 (2007), pp.87-93.


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  • Corrosion Behavior of Aluminium Alloy Aa2219-T87 Welded Plates in Sea Water

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Authors

G. Venkatasubramaniana
Department of Chemistry, Sathyabama University, Jeppiaar Nagar, Chennai-600119, India
A. Sheik Mideena
Department of Chemistry, Sathyabama University, Jeppiaar Nagar, Chennai-600119, India
Abhay K. Jhab
Materials Characterization Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, Trivandrum–695022, India

Abstract


The corrosion behavior of aluminium alloy AA2219-T87 welded plates in seawater was investigated using potentiodynamic polarization and EIS techniques. The potentiodynamic polarization curves reveal that heat affected zone (HAZ) is more prone to corrosion than weld zone (WZ) and base metal (BM). This is further confirmed by EIS which showed a decrease of Rct-. The microstructures of AA2219-T87 were made by optical microscopy and SEM. The higher environmental susceptibility of HAZ as compared to BM is caused by the dissolution and segregation of CuAl2 intermetallic particles along the grain boundaries. The corrosion rate of WZ is due to the presence of micro pores and copper rich areas in α-matrix.

Keywords


Aluminium, EIS, SEM, Heat Affected Zone

References





DOI: https://doi.org/10.17485/ijst%2F2012%2Fv5i11%2F30644