目的 针对极端磨损环境,探究6061铝合金的腐蚀磨损耦合效应及影响规律,并揭示其损伤机制。方法 在模拟海洋大气盐雾环境下对6061铝合金试样进行腐蚀磨损循环试验,采用腐蚀磨损体积损失、表面形貌观察、腐蚀产物成分表征及电化学测试等手段对腐蚀磨损循环试验后铝合金的腐蚀机理进行综合分析。结果 在10、30、50 m/s的滑动速度下,中性盐雾磨损体积损失分别增加了24.2%、32.3%、19.8%,协同作用在总损伤中占比分别为63.38%、83.5%、87.04%;酸性盐雾磨损体积损失分别增加31.9%、41.9%、30.4%,协同作用在总损伤中占比分别为63.92%、85.94%、88.08%。结论 在腐蚀磨损耦合作用下,铝合金的损伤机制随速度发生变化,且腐蚀与磨损相互促进,其中酸性环境因生成疏松耐磨性差的产物而使损伤更严重。
Abstract
The work aims to investigate the corrosion and wear coupling effect and its impact rules on 6061 aluminum alloy under extreme wear conditions and reveal its damage mechanism. The 6061 aluminum alloy specimens were subjected to cyclic corrosion and wear tests in a simulated marine atmospheric salt spray environment. Comprehensive analysis of the corrosion mechanism of the alloy after cyclic tests was carried out by means of corrosion-wear volume loss measurement, surface morphology observation, corrosion product composition characterization and electrochemical testing. Under sliding speeds of 10 m/s, 30 m/s and 50 m/s, the wear volume loss under neutral salt spray increased by 24.2%, 32.3% and 19.8%, and the proportion of synergistic effect in total damage was 63.38%, 83.5% and 87.04%, respectively. Under acidic salt spray, the wear volume loss increased by 31.9%, 41.9% and 30.4%, and the corresponding proportions of synergistic effect were 63.92%, 85.94% and 88.08%, respectively. Under the coupling effect of corrosion and wear, the damage mechanism of the aluminum alloy varies with sliding speed, and corrosion and wear promote each other. In particular, the acidic environment leads to more severe damage due to the formation of loose corrosion products with poor wear resistance.
关键词
6061铝合金 /
海洋大气 /
盐雾试验 /
腐蚀磨损 /
摩擦速度 /
耦合效应中图分类号：
Key words
6061 aluminum alloy /
marine atmosphere /
salt spray test /
corrosionand wear /
friction velocity /
coupling effect
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