Corrosion Wear Properties of 2024 Al-Alloy in Artificial Seawater

doi:10.11902/1005.4537.2016.183

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (6): 587-594 DOI: 10.11902/1005.4537.2016.183

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Corrosion Wear Properties of 2024 Al-Alloy in Artificial Seawater

Yongqi TAO^1,²,Gang LIU²,Yesheng LI¹(

),Zhixiang ZENG²

1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2. Zhejiang Key Laboratory of Marine Materials and Protection Technology, Key Laboratory of Marine New Materials and Related Technology, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China;

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Abstract

The tribocorrosion behavior of 2024 Al-alloy in artificial seawater was studied, using a pin-on-disk reciprocating friction and wear tester integrated with a potentiostat for electrochemical test. The result showed the material loss caused by wear-corrosion processes without cathodic protection was larger than that with cathodic protection, indicating synergistic effect of mechanical wear and corrosion process. The ratio of the mechanical wear to the total degradation ranged from 70.3% to 98.2%, which indicated mechanical wear component prevailed over the corrosion component. The proportion of the mass loss caused by wear-corrosion synergism to the total degradation was between 1.8% and 29.7%, and therefore the wear-corrosion synergism could not be neglected.

Key words: 2024 aluminium alloy seawater corrosion-wear synergistic effect

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Yongqi TAO,Gang LIU,Yesheng LI,Zhixiang ZENG. Corrosion Wear Properties of 2024 Al-Alloy in Artificial Seawater. Journal of Chinese Society for Corrosion and protection, 2016, 36(6): 587-594.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.183 OR https://www.jcscp.org/EN/Y2016/V36/I6/587

Fig.1 Schematic view of components of tribocorrosiontester

Fig.2 Friction coefficient (a) wear rate (b) and hardness (c) curves of 2024 aluminium alloy under different loading conditions in artificial seawater

Fig.3 SEM images of worn surfaces of 2024 aluminium alloy after pure mechanical wear (a~d) and tribocorrosion (e~h) under 5 N (a, e), 10 N (b, f), 25 N (c, g) and 50 N (d, h) load (The sliding direction is from bottom to top)

Fig.4 XPS spectra of the corrosion product film fromed on 2024 aluminium alloy tribocorroded under 50 N after argon ion sputter etching for 0 s (a), 180 s (b) and 720 s (c)

Fig.5 Variations of OCP of 2024 aluminium alloy before, during and after sliding in artificial seawater with load

Fig.6 Polarization curves of 2024 aluminium alloy under corrosion and corrosion-wear conditions

Fig.7 Contributions of the different components to the total material loss in the tribocorrosion tests under 5 N (a), 10 N (b), 25 N (c) and 50 N (d)

Table 2 Components and proportions of material loss in corrosion wear process

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