Abstract The degradation behaviour of a marine epoxy coating on Q235 steel under mechanical stress in 3.5 % NaCl solution was investigated by electrochemical impedance spectroscopy (EIS) and adhesion tests. Results revealed that mechanical stress had a significant effect on coating barrier properties, adhesion, delaminated area, water uptake and diffusion, and this effect was not only related to the magnitude and direction of stress, but depended on immersion time. The coating under mechanical stress, regardless of stress direction, deteriorated faster than that under unstressed state. The disparity in changing trends of water uptake and diffusion coefficient with mechanical stress was also discussed.

中文翻译：

---

机械应力对低碳钢基材船用涂层保护性能的影响

摘要 通过电化学阻抗谱（EIS）和附着力测试研究了Q235钢在机械应力作用下在3.5% NaCl溶液中海洋环氧涂层的降解行为。结果表明，机械应力对涂层的阻隔性能、附着力、分层面积、吸水和扩散有显着影响，这种影响不仅与应力的大小和方向有关，还与浸渍时间有关。无论应力方向如何，机械应力下的涂层都比无应力状态下的涂层恶化得更快。还讨论了吸水和扩散系数随机械应力变化趋势的差异。