Abstract In this work, a systematic investigation was carried out to study the electrochemical and tribocorrosion behavior of LY12 aluminum alloy sliding against an Al2O3 pin in artificial seawater, using a pin-on-disc tribometer combined with an in situ electrochemical workstation. The results revealed that the cathodic shift of open circuit potential and two order of magnitude increase in current density caused by rubbing can be confirmed. There was a general trend that the total material loss of LY12 aluminum alloy increased with an increase in applied potential, indicating the synergistic effect between wear and corrosion, thus resulting in accelerated material degradation. When the potential was below −0.4 V, wear-induced corrosion was negligible; however, corrosion-induced wear was high and increased significantly with an increase in potential. When the potential was above −0.4 V, wear-induced corrosion increased sharply with an increase in potential and corrosion-induced wear was dominant. The significant role of corrosion-induced wear in the increment of material degradation can be attributed to the formation of corrosion pits and fragment layers in the wear track at high potential.

中文翻译：

---

LY12铝合金在人工海水中的摩擦腐蚀行为

摘要 在这项工作中，采用针盘摩擦计结合原位电化学工作站，系统研究了LY12铝合金在人工海水中与Al2O3针滑动的电化学和摩擦腐蚀行为。结果表明，可以确认由摩擦引起的开路电位的阴极偏移和电流密度的两个数量级增加。LY12铝合金的总材料损失总体上随着外加电位的增加而增加，表明磨损和腐蚀之间存在协同作用，从而导致材料降解加速。当电位低于-0.4 V时，磨损引起的腐蚀可以忽略不计；然而，腐蚀引起的磨损很高，并且随着电位的增加而显着增加。当电位高于-0.4 V时，磨损引起的腐蚀随着电位的增加而急剧增加，并且腐蚀引起的磨损占主导地位。腐蚀引起的磨损在材料降解增加中的重要作用可归因于在高电位下磨损轨迹中腐蚀坑和碎片层的形成。