Effect of Aging Treatment on Corrosion Rate of 7050 Al-alloy Plate

doi:10.11902/1005.4537.2016.025

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (3): 287-292 DOI: 10.11902/1005.4537.2016.025

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Effect of Aging Treatment on Corrosion Rate of 7050 Al-alloy Plate

Fengxuan SONG¹(

),Qizhong ZHAO¹,Feilong LI¹,Yuelu REN¹,Kui HUANG¹,Xinming ZHANG^1,²

1 Guangxi Alnan Aluminum Inc., Nanning 530031, China
2 School of Materials Science and Engineering, Central South University, Changsha 410083, China

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Abstract

Three groups of the same 7050 Al-alloy plates were all aged firstly at 121 ℃ for 6 h and then aged subsequently at 163 ℃ for 0, 12 and 24 h respectively. The corrosion performance of the aging treated alloy plates was characterized by means of mass loss measurement, potentiodynamic polarization curve measurement and corrosion cracking propagation measurement, as well as optical microscope (OM). The results show that the corrosion type of the aged alloy plates changed from localized corrosion to general corrosion gradually with increasing ageing time and the corrosion rate decreased constantly. Meanwhile, the manner of corrosion cracking propagation for the aged alloys transformed from intergranular to transgranular gradually with the increasing ageing time. This makes the rate of corrosion cracking propagation become lower continuously. The corrosion current density for the different aged alloy plates were assessed by potentiodynamic polarization technique, which may be ranked as the following order: peak-aged state >under-aged state > over-aged state.

Key words: 7050 aluminum alloy plate corrosion rate potentiodynamic polarization corrosion cracking aging

Received: 22 February 2016

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	Fengxuan SONG
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Cite this article:

Fengxuan SONG,Qizhong ZHAO,Feilong LI,Yuelu REN,Kui HUANG,Xinming ZHANG. Effect of Aging Treatment on Corrosion Rate of 7050 Al-alloy Plate. Journal of Chinese Society for Corrosion and protection, 2017, 37(3): 287-292.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.025 OR https://www.jcscp.org/EN/Y2017/V37/I3/287

Fig.1 Changes of mass loss (a) and mass loss rate (b) of 7050 aluminum alloy aged under different conditionsduring immersion in 3.5%NaCl solution

Fig.2 Polarization curves (a) and corrosion rates (b) of 7050 aluminum alloy in different aged conditions

Fig.3 Variations of the maximum corrosion depth and average corrosion depth in longitudinal section of three aged 7050 aluminum alloy samples with immersion time

Fig.4 Corrosion morphologies of different aged 7050 Al alloy samples after immersion in 3.5%NaCl solution for 12 h: (a, b) surface and (c, d) cross section of SA0, (e) surface and (f) cross section of SA12 (RD: rolling direction, ND: normal direction, TD: tranversal direction)

Fig.5 Schematic representations of the electrochemical behavior for the precipitates existing nearby the grain boundaries of the alloy treated under different aged conditions (the higher the gray level, the more negative the potential)

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