CORROSION BEHAVIORS OF FRICTION STIR WELDED JOINT OF 7075 ALUMINUM ALLOYS UNDER NATURAL SALT SPRAY

J Chin Soc Corr Pro

2010, Vol. 30

Issue (3): 236-240 DOI:

Research Articles

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CORROSION BEHAVIORS OF FRICTION STIR WELDED JOINT OF 7075 ALUMINUM ALLOYS UNDER NATURAL SALT SPRAY

LUAN Guohong¹, FU Ruidong^2,3, DONG Chunlin¹, HE Miao¹,KANG Ju³

1. China FSW Center, Beijing FSW Technology Limited Company, Beijing 100024
2. State Key Laboratory of Metastable Materials Science and Technology, Qinhuangdao,066004
3. College of Materials Science and Engineering, Yanshan University, Qinhuangdao, 066004

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Abstract

The microstructure of friction stir welded (FSW) joint of 7075 aluminum alloy were examined by using of optical microscope and transmission electron microscope. The corrosion behaviors of the joint were investigated by method of natural salt spray. The macroscopical and microscopical appearances of the weld seam were observed by using of scanning electron microscope after corrosion test. The results show that the size of the grain and the second phase particles in the weld zone has been obviously refined. The distribution of the second phase particles are not homogeneous on the weld seam surface. The resistance to corrosion of FSW seam is lower than that of base metal enveloped with pure aluminum layer. The corrosion styles during the initial stage are mainly local pitting and intergranular corrosion and develop to exfoliation corrosion after long time corrosion.

Key words: 7075 aluminum alloy FSW salt spray test corrosion

Received: 20 February 2009

ZTFLH:

TG178

Corresponding Authors: FU Ruidong E-mail: rdfu@ysu.edu.cn

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Cite this article:

LUAN Guohong, FU Ruidong, DONG Chunlin, HE Miao,KANG Ju. CORROSION BEHAVIORS OF FRICTION STIR WELDED JOINT OF 7075 ALUMINUM ALLOYS UNDER NATURAL SALT SPRAY. J Chin Soc Corr Pro, 2010, 30(3): 236-240.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I3/236

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