Metal substrate at the damaged coating, exposed directly to the corrosive medium, is susceptible to the localized corrosion, due to the formation of occluded corrosion cells. Herein, a new facile strategy for addressing the localized corrosion issue at damaged coating using a triboelectric nanogenerator (TENG) was proposed. The wind-driven TENG with a simple double-layer structure was designed. The output performance of the TENG can be controlled by adjusting structural parameters and the wind speeds, with the maximum short circuit current, output voltage and corresponding power reaching approximately 102.5 μA, 814 V and 7.6 mW, respectively, at a wind speed of 7.5 m/s. The electrons generated by the TENG can be transferred to the metal substrate at the damaged coating, inducing the cathodic polarization of the metal and providing effective cathodic protection. The reduction reaction, with the consumption of O2 and the formation of OH-, occurs at the metal substrate at the damaged coating. A protective local environment is created by the combination of increased pH and removal of Cl- under the electric field of the TENG. To evaluate the corrosion behavior, immersion experiments and electrochemical measurements were conducted in 3.5 wt% NaCl when the Q235 steels covered the damaged coating were coupled with and without the wind-driven TENG at different wind speeds. Meanwhile, the influence of TENG’s output performance on the cathodic protection effect for the metal substrate at the damaged coating is discussed. This study expands the application of the TENG in the field of corrosion resistance.

中文翻译：

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通过风驱动摩擦纳米发电机解决受损涂层局部腐蚀问题的新简便策略


受损涂层处的金属基材直接暴露于腐蚀介质，由于形成封闭的腐蚀细胞，容易受到局部腐蚀。在此，提出了一种使用摩擦纳米发电机（TENG）解决受损涂层局部腐蚀问题的新简便策略。设计了具有简单双层结构的风驱动TENG。 TENG的输出性能可以通过调整结构参数和风速来控制，在风速为7.5 m时，最大短路电流、输出电压和相应功率分别达到约102.5 μA、814 V和7.6 mW /s。 TENG产生的电子可以转移到受损涂层处的金属基底，诱导金属的阴极极化并提供有效的阴极保护。还原反应发生在受损涂层处的金属基材上，消耗 O2 并形成 OH-。在 TENG 电场的作用下，pH 值升高和 Cl- 去除相结合，形成了一个受保护的局部环境。为了评估腐蚀行为，当覆盖受损涂层的 Q235 钢在不同风速下耦合和不耦合风力驱动 TENG 时，在 3.5 wt% NaCl 中进行了浸泡实验和电化学测量。同时讨论了TENG输出性能对金属基体涂层损伤处阴极保护效果的影响。该研究拓展了TENG在耐腐蚀领域的应用。