The corrosion damage of an organic coating system was accelerated by different AC-DC-AC tests in comprison with neutral salt spray (NSS) and natural immersionn. Electrochemical impedance spectroscopy (EIS), optical microscopy, scanning electron microscopy (SEM), laser microscopy, adhesion measurement, and energy dispersive spectroscopy (EDS) was employed to reveal the degradation processes of the coating. The results showed that the corrosion damage could be rationally accelerated in the same way as that in natural immersion condition if an alternate anodic polarization and a cathodic polarization were included in the DC step during the AC-DC-AC test. The accelerated corrosion damage had the same electrochemical behavior, surface morphology and product composition as that in natural immersion.

中文翻译：

---

不同AC-DC-AC试验加速有机涂层腐蚀损伤

通过不同的AC-DC-AC试验，包括中性盐雾（NSS）和自然浸泡，加速了有机涂层体系的腐蚀损坏。采用电化学阻抗谱（EIS）、光学显微镜、扫描电子显微镜（SEM）、激光显微镜、附着力测量和能量色散光谱（EDS）来揭示涂层的降解过程。结果表明，在AC-DC-AC试验过程中，如果直流步骤中包含交替的阳极极化和阴极极化，则可以以与自然浸泡条件相同的方式合理地加速腐蚀损伤。加速腐蚀损伤具有与自然浸泡相同的电化学行为、表面形貌和产物成分。