Effect of Pressure Load and Friction Frequency on Wear Corrosion Behavior of 7075 Al-alloy

doi:10.11902/1005.4537.2025.035

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (6): 1669-1678 DOI: 10.11902/1005.4537.2025.035

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Effect of Pressure Load and Friction Frequency on Wear Corrosion Behavior of 7075 Al-alloy

LI Zanlong, YAN Qing, MAN Cheng(

)

School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

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LI Zanlong, YAN Qing, MAN Cheng. Effect of Pressure Load and Friction Frequency on Wear Corrosion Behavior of 7075 Al-alloy. Journal of Chinese Society for Corrosion and protection, 2025, 45(6): 1669-1678.

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Abstract

7075 Al-alloy is subjected to the dual effects of wear and corrosion in marine environment, resulting in long-term accumulation failure, which causes a serious threat to the safety and efficiency of offshore operations. However, the mechanism by which wear and corrosion affect the corrosion behavior of 7075 Al-alloy is still unclear. Hence, the wear and corrosion behavior of 7075 Al-alloy was studied in conditions of varying pressure load and friction frequency in terms of the coefficient of friction (COF), open circuit potential and potentiodynamic polarization, meanwhile the s morphology and composition of the friction-wear scars was examined by SEM image and the results of EDS. The main conclusions are as follows: COF values increase to different degrees under different friction frequencies and different pressure loads. Compared to static corrosion environment, the current density of 7075 Al-alloy under friction condition increases significantly by 2-3 orders of magnitude. When the friction force is relatively low (5 N-0.01 Hz and 5 N-0.10 Hz), the mechanism is abrasive wear; when the friction force is relatively high, it is adhesive wear, which is manifested as a large-particle tearing morphology. Therefore, the loss of materials caused by wear and corrosion is not a simple superposition of static corrosion and mechanical wear.

Key words: 7075 Al-alloy wear corrosion wear mechanism interaction

Received: 13 February 2025 32134.14.1005.4537.2025.035

ZTFLH:

TG174

Fund: Shandong Provincial Colleges and Universities Youth Innovation Team Plan(2022KJ055)

Corresponding Authors: MAN Cheng, E-mail: mancheng@ouc.edu.cn

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https://www.jcscp.org/EN/10.11902/1005.4537.2025.035 OR https://www.jcscp.org/EN/Y2025/V45/I6/1669

Fig.1 Schematic diagram of tribocorrosion device

Fig.2 COF (a, b) and OCP (c, d) curves of 7075 Al-alloy during tribocorrosion at different frequencies (a, c) and applied loads (b, d)

Fig.3 Potentiodynamic polarization curves (a, b) and fitting date (c, d) of 7075 Al-alloy during tribo-corrosion at different frequencies (a, c) and applied loads (b, d)

Table 1 Fitting parameters of potentiodynamic polarization curves of 7075 Al-alloy

Fig.4 3D morphologies of the wear tracks of 7075 Al-alloy after tribocorrosion at different frequencies and loads: (a) 0.01 Hz, 5 N, (b) 0.05 Hz, 5N, (c) 0.10 Hz, 5 N, (d) 0.50 Hz, 5 N, (e) 0.75 Hz, 5 N, (f) 1.00 Hz, 5N, (g) 1.00 Hz, 10 N, (h) 1.00 Hz, 20 N, (i) 1.00 Hz, 30 N, (j) 1.00 Hz, 40 N

Fig.5 Cross-section profiles of the wear tracks (a, b) and wear volumes (c, d) of 7075 Al-alloy after tribo-corrosion at different frequencies (a, c) and applied loads (b, d)

Fig.6 SEM images of the wear tracks of 7075 Al-alloy after tribocorrosion at different frequencies and loads: (a) 0.01 Hz, 5 N, (b) 0.05 Hz, 5 N, (c) 0.10 Hz, 5 N, (d) 0.50 Hz, 5 N, (e) 0.75 Hz, 5N, (f) 1.00 Hz, 5 N, (g) 1.00 Hz, 10 N, (h) 1.00 Hz, 20 N, (i) 1.00 Hz, 30 N, (j) 1.00 Hz, 40 N

Table 2 EDS results of the compositions of the four marked points in Fig.6

Fig.7 Loss ratios of various wear components for 7075 Al-alloy after tribo-corrosion conditions at different frequencies (a, b) and applied loads (c, d) (Fig.7b and Fig.7d are enlarged views of the red dashed boxes in Fig.7a and Fig.7b, respectively)

Table 3 Calculated values of various wear components under the different tribocorrosion conditions

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