To improve the alternating current-direct current-alternating current (AC-DC-AC) coating evaluation technique, the single DC step in the AC-DC-AC method was replaced with a combination of cathodic and anodic polarization in this work. The modified alternate anodic and cathodic AC-DC-AC method experimentally proved to more reliably evaluate the protection performance of an acrylic varnish paint coating than the conventional AC-DC-AC test, as it could more rationally accelerate the coating degradation process without changing the mechanism of the coating corrosion damage. The corrosion damage and mechanism of the acrylic varnish paint coating/Q215 steel system was discussed in detail based on the results obtained from the modified AC-DC-AC tests.

为了改进交流-直流-交流 (AC-DC-AC) 涂层评估技术，在这项工作中，AC-DC-AC 方法中的单个直流步骤被阴极和阳极极化的组合所取代。实验证明，改进的阳极和阴极交替 AC-DC-AC 方法比传统的 AC-DC-AC 测试更可靠地评估丙烯酸清漆涂料涂层的保护性能，因为它可以更合理地加速涂层降解过程而不改变涂层腐蚀损伤机理。基于改进的AC-DC-AC试验结果，详细讨论了丙烯酸清漆涂层/Q215钢体系的腐蚀损伤和机理。