CORROSION BEHAVIOR OF FRICTION STIR WELDED JOINT OF 2024 ALUMINUM ALLOYS UNDER ACID SALT SPRAYING

J Chin Soc Corr Pro

2010, Vol. 30

Issue (5): 396-402 DOI:

Research Articles

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CORROSION BEHAVIOR OF FRICTION STIR WELDED JOINT OF 2024 ALUMINUM ALLOYS UNDER ACID SALT SPRAYING

FU Ruidong^1,2, HE Miao³, LUAN Guohong³, DONG Chunlin³,KANG Ju²

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

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Abstract The microstructures of friction stir welded (FSW) joint of 2024 aluminum alloy were examined by using optical microscope and transmission electron microscope. The corrosion behaviors of the joint were investigated by method of acid salt spray. The analysis results of microstructure show that the arc stripe is the main feature on the surface of the weld seam due to the extrusion action of the shoulder of the stir tool. The grain and second phase particles are also refined. The second phase particles are mainly composed of Al₂CuMg(S phase) and CuAl₂(θ phase). The corrosion test shows that the resistance to corrosion of FSW seam is lower than that of base metal pure aluminum layer. There exists an unevenness for the corrosion of the FSW seam. The corrosion initially results from pitting corrosion and finally develops to exfoliation.

Key words: 2024 aluminum alloy friction stir welding microstructure salt spray test corrosion

Received: 20 April 2009

ZTFLH:

TG178

Corresponding Authors: RuiDong Fu E-mail: rdfu@ysu.edu.cn

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FU Ruidong, HE Miao, LUAN Guohong, DONG Chunlin,KANG Ju. CORROSION BEHAVIOR OF FRICTION STIR WELDED JOINT OF 2024 ALUMINUM ALLOYS UNDER ACID SALT SPRAYING. J Chin Soc Corr Pro, 2010, 30(5): 396-402.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I5/396

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