Corrosion wear behaviors of 2024Al in artificial rainwater and seawater at fretting contact
Corrosion wear behaviors of 2024Al in artificial rainwater and seawater at fretting contact
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DOI：
10.1016/j.wear.2008.11.031
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发表时间：
2009-06
期刊：
影响因子：
5
通讯作者：
H. Ding;G. Zhou;Z. Dai;Yunfeng Bu;Tong Jiang
中科院分区：
文献类型：
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作者：
H. Ding;G. Zhou;Z. Dai;Yunfeng Bu;Tong Jiang
在蒸馏水、人工海水和雨水中，采用振幅为300μm的球对球结构，研究了2024Al铝合金平板试样与440C不锈钢counter ball试样在室温下1h的微动磨损行为。采用动电位阳极极化法测量2024Al腐蚀磨损试验前后的腐蚀行为。利用扫描电子显微镜（SEM）观察了试样的磨损表面。用x射线光电子能谱（XPS）测定了磨损痕上元素的价态。使用非接触式光学轮廓仪测定了三维形貌和磨损体积损失。分析了频率和含水介质对摩擦系数和磨损损失的影响。结果表明：在三种水溶液中，摩擦系数普遍随频率的增加而减小；与蒸馏水相比，雨水和海水中的摩擦系数分别降低了21.47%和47%。这表明水溶液对2024Al试样摩擦系数的影响很大，因为在试样上形成了润滑膜。但由于氯离子对磨损痕的侵蚀作用，两种腐蚀溶液中的磨损损失均大于蒸馏水。在蒸馏水中磨损量增加，在雨水中增加更多，在海水中增加更多；这证明了腐蚀和磨损之间的积极协同作用。协同作用（ΔV）对2024Al总磨损损失(V)的贡献表明，海水中的协同作用比雨水中的更差。2024Al在雨水中以磨蚀磨损为主，在海水中以腐蚀疲劳为主。
The fretting wear behaviors of an aluminum alloy 2024Al flat specimen against a 440C stainless steel counter ball specimen were evaluated in distilled water, artificial seawater and rainwater by using a ball-on-flat configuration with 300μm amplitude at room temperature for 1h. Potentiodynamic anodic polarization was used to measure the corrosion behaviors of 2024Al before and after the corrosion wear test. The worn surfaces of the specimens were observed using scanning electron microscopy (SEM). The valence of the elements on the wear scars was detected by X-ray photoelectron spectroscopy (XPS). The 3D-morphology and wear volume-loss were determined using a non-contact optical profilometer. The influences of the frequency and aqueous mediums on the friction coefficient and wear loss were analyzed. Results show that the friction coefficient decreases generally with the frequency increasing in the three aqueous solutions. The friction coefficient decreases 21.47% in rainwater and 47% in seawater compared with that in distilled water. This indicates the considerable influence of aqueous solutions on the friction coefficient due to the lubricative film formed on the 2024Al specimens. However, the wear loss in both the corrosive solutions is always larger than that in distilled water due to the erosion effect of chlorine ions on the wear scar. Wear loss increased in distilled water, increased more in rainwater, and increased even more in seawater; this demonstrates a positive synergism between corrosion and wear. The contribution of synergism (ΔV) to total wear loss (V) of 2024Al reveals that the synergism is worse in seawater than in rainwater. The wear mechanism of 2024Al is dominating abrasion wear in rainwater, whereas it becomes corrosion fatigue in seawater.