Galvanic Corrosion Related to Steel/Aluminum Dissimilar Joining Tailored Blank

Abstract:

In order to use a steel/aluminum tailored blank in actual practice, galvanic corrosion due to the contact of dissimilar metals should be examined. However, few studies have reported the influence of galvanic corrosion on a steel/aluminum laser butt-welded joint. In this study, the effect of galvanic corrosion on the strength of SPCC/A1100-O laser butt-welded joints was investigated by immersion tests in air, distilled water, and salt water. The appearance was observed and tensile tests were conducted. In addition, the joint interface and the surface near the joint interface were observed and analyzed by FE-SEM and EDS. During the immersions in distilled water and in salt water, specimens were covered with an oxide film and the joint strength decreased. In the salt water immersions, the strength of the SPCC base materials decreased. And a large reduction of the cross-sectional area of the A1100-O side of the joints was seen in the salt water immersions. From the results of the observations and analyses by FE-SEM and EDS, a layer of brittle intermetallic compounds formed in the joint interface during the immersion test, and corrosion progressed as the oxide film sloughed off.

• Periodical: Key Engineering Materials (Volumes 611-612)
• Pages: 1460-1467
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.611-612.1460
• Online since: May 2014
• Authors: Shoki Takehisa*, Takashi Iizuka
• Keywords: Aluminum (Al), EDS Analysis, FE-SEM, Galvanic Corrosion, Immersion Test, Intermetallic Compound, Laser Butt Welding, Steel, Tailored Blank, Welding Dissimilar Metals

References

[1] T. Morita, A. Sakamoto, S. Mabuchi, T. Iizuka, Strength and Formability of Friction Stir Welded Aluminum Alloy with Cold Rolled Steel, Journal of the Society of Materials Science, 58, 4 (2009), 317-322.

DOI: 10.2472/jsms.58.317

[2] J. Wloka, H. Laukant, U. Glatzel, S. Virtanen, Corrosion properties of laser beam joints of aluminium with zinc-coated steel, Corrosion Science 49 (2007), 4243-4258.

DOI: 10.1016/j.corsci.2007.04.014

[3] K. Nishimoto, et al., Laser Pressure Welding of Aluminum Alloy and Low Carbon Steel, QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY, 22, 4, (2004).

DOI: 10.2207/qjjws.22.572

[4] M.J. Rathod, M. Kutsuna, Joining of aluminum alloy 5052 and low-carbon steel by laser roll welding, Welding Research 83 (2004), 16s-26s.

[5] H. Ozaki, M. Kutsuna, Dissimilar Metal Joining of Zinc Coated Steel and Aluminum Alloy by Laser Roll Welding, in: R. Kovacevic (Ed. ), Welding processes (2012), Radovan, 33-54.

DOI: 10.5772/48242

[6] T. Iizuka, S. Kajikawa, N. Hatanaka, N. Takakura, Fundamental Formability of SPC/A1100 Hybrid Sheet Welded by Butt Laser Welding, Steel Research International Special Edition (ICTP 2011), 651-656.

[7] T. Iizuka, R. Itani, Observation of Welded Interface of SPCC/A1100-O Tailored Blanks Made by Butt Laser Welding, Key Engineering Materials, 504-506 (2012), 405-410.

DOI: 10.4028/www.scientific.net/kem.504-506.405