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Research on Salt Fog Corrosion Behavior of Welded Joint of 7N01-T4 Aluminum Alloy for High-Speed Train

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Abstract:

Salt fog corrosion test was employed to observe the corrosion behavior of welded joint of 7N01-T4 aluminum alloy of high-speed train. Tensile strength and hardness change after corrosion were tested and micro morphology was observed by metalloscope and LCSM. The results indicated that HAZ was the most sensitive corrosion zone in welded joint of 7N01-T4 in chlorinated moisture environment. Influenced by the heat-input of welding, the grains of HAZ were coarsening and inhomogeneous. A corrosion cell between welding seam with high Mg content and HAZ with high Zn content formed. HAZ corroded preferentially as anode, and the dissolving of zinc-rich phase in grain boundary resulted in the extending of corrosion crack along grain boundaries.

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Advanced Materials, CEAM 2011 View Preview

Info:

Periodical:

Advanced Materials Research (Volumes 239-242)

Pages:

2822-2826

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.239-242.2822

Citation:

Cite this paper

Online since:

May 2011

Authors:

Xiao Min Wang, Jun Jing Zhao, Guo Qing Gou

Keywords:

7N01-T4 Aluminum Alloy, Corrosion, Heat Affected Zone (HAZ), Weld Joint

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