Corrosion Property of Al-Alloy 6061-T6 Processed by Multi-pass Friction Stir Processing

doi:10.11901/1005.3093.2014.669

Chinese Journal of Materials Research

2015, Vol. 29

Issue (8): 589-594 DOI: 10.11901/1005.3093.2014.669

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Corrosion Property of Al-Alloy 6061-T6 Processed by Multi-pass Friction Stir Processing

Miao WANG¹,Qiang LIU^1,^2,^**(

),Yaxiong ZHANG¹,Nannan ZHANG¹,Manping LIU^1,²

1. School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China
2. Jiangsu Province Key Laboratory of High-end Structural Materials, Zhenjiang 212013, China

Cite this article:

Miao WANG,Qiang LIU,Yaxiong ZHANG,Nannan ZHANG,Manping LIU. Corrosion Property of Al-Alloy 6061-T6 Processed by Multi-pass Friction Stir Processing. Chinese Journal of Materials Research, 2015, 29(8): 589-594.

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Abstract

The 6061-T6 aluminium alloy was modified by multi-pass friction stir process with air or water cooling. Corrosion behavior of the processed zone was investigated by immersion test and electrochemical corrosion test, as well as optical microscopy, SEM and TEM. The results show that the grain size of stirred zone was successfully refined and its corrosion resistance became better obviously after the base metal was modified by FSP with different cooling methods. Compared with the base metal, the nugget zone exhibited higher free-corrosion potential, smaller corrosion current density and greater corrosion impedance. Compared to FSP with water-cooling, the nugget zone prepared by FSP with air-cooling showed better corrosion resistance.

Key words: materials failure and protection 6061-T6 aluminium alloy friction stir process nugget zone corrosion property

Received: 12 November 2014

Fund: *Supported by Jiangsu Province Key Laboratory of Tribology Fund No.Kjsmcx2011004, Jiangsu University Senior Talent fund No.11JDG140, Natural Science Foundation of Jiangsu Province No. BK2012715

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	Miao WANG
	Qiang LIU
	Yaxiong ZHANG
	Nannan ZHANG
	Manping LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.669 OR https://www.cjmr.org/EN/Y2015/V29/I8/589

Fig.1 Optical microstructures of base metal(a), nugget zone of FSP by air-cooled(b) and nugget zone of FSP by water-cooled (c)

Fig.2 Intergranular corrosion micrographs of base metal (a), nugget zone of FSP by air-cooled (b) and nugget zone of FSP by water-cooled (c)

Fig.3 Exfoliation corrosion micrographs of different samples (a) base metal; (b) nugget zone of FSP by air-cooled; (c) nugget zone of FSP by water-cooled; (d) EDS analyses of FSP by air-cooled

Fig.4 Tafel polarization plots of different samples

Table 1 Parameters of electrochemical corrosion

Fig.5 Nyquist plots of different samples

Fig.6 TEM image with different magnification of different samples (a) and (b) base metal, (c) and (d) nugget zone of FSP by air-cooled, (e) and (f) nugget zone of FSP by water-cooled

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