Corrosion Behavior of 6082-T6 Al Joint Welded with Twin Wire MIG

Abstract:

Corrosion behavior and mechanism of 6082-T6 Al-alloy twin wire MIG welded joint under salt spray corrosion in 5 wt.% NaCl solution were investigated via laser scan confocal microscope, scanning electron microscope spectrometer and infrared spectroscope. Pitting was seen on both weld seam and the base metal resulted from Cl-. Uniform corrosion was also seen on the weld seam, grain boundaries had been corroded and approximate circular corrosion channels were observed, while evident pitting corrosion was seen in the base metal. Corrosion resistance of the base metal was better than that of the weld seam. The main corrosion products were composed of Al₂O₃, Al(OH)₃ and AlCl₃•6H₂O. Corrosion had a slight effect on the test sample's tensile strength, and serious results on the plasticity of the joints. In addition, transition from prior corrosion ductile to after corrosion hybrid brittle and ductile morphology was also found on the fracture surface.

• Periodical: Advanced Materials Research (Volumes 418-420)
• Pages: 1368-1374
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.418-420.1368
• Online since: December 2011
• Authors: Ye Ruan, Xiao Ming Qiu, Wen Biao Gong
• Keywords: 6082-T6 Al-Alloy, Corrosion, Twin Wire MIG, Welded Joint

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