Abstract Wetting ability is a crucial property for self-cleaning applications. Amphiphobic surfaces have an excellent repellency for both water and organic droplets. Herein, we electrodeposited an amphiphobic cobalt coating. First, a hydrophobic coating with the contact angle (CA) of 121° is achieved through the optimization of deposition condition (current density of 92 mA.cm−2 and pH of 3.25). Surface hydrophobicity is attributed to the uniform hierarchical morphology of the coating achieved by deposition process along with the gradual removal of molecular water and adsorption of airborne hydrocarbons during 5 days. Then, we modified the coating with a fluorinated solution. So, the surface becomes superhydrophobic with a water CA of 161° and a very low contact angle hysteresis (CAH) of approximately 8°. The hydrophobic coating demonstrated oleophilic property against glycerol (CA = 39°) and octane (CA = 18°), in which after the modification through fluorinated solution, the CAs of glycerol and octane increased to 141° and 130°, respectively. AFM results showed that the roughness of the modified coating remained constant, and thus it was concluded that the enhanced liquid repellency is originated from the low surface energy. The modified surface preserved its amphiphobic property after 6 months of exposure to air at ambient temperature. Eventually, the corrosion behavior assessments reveal that the modified coating enhanced the corrosion inhibition compared to the pure cobalt coating by reducing the corrosion current density by 82%.

中文翻译：

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多功能钴涂层，具有卓越的两性性能：自清洁和腐蚀抑制

摘要 润湿能力是自清洁应用的关键特性。两性表面对水和有机液滴具有极好的排斥性。在这里，我们电沉积了两性钴涂层。首先，通过优化沉积条件（电流密度为 92 mA.cm-2，pH 值为 3.25）实现了接触角 (CA) 为 121° 的疏水涂层。表面疏水性归因于通过沉积过程以及在 5 天内逐渐去除分子水和吸附空气中的碳氢化合物而实现的涂层的均匀分层形态。然后，我们用氟化溶液对涂层进行了改性。因此，表面变得超疏水，水的 CA 为 161°，接触角滞后 (CAH) 非常低，约为 8°。疏水涂层表现出对甘油（CA = 39°）和辛烷（CA = 18°）的亲油性，其中通过氟化溶液改性后，甘油和辛烷的CA分别增加到141°和130°。AFM 结果表明改性涂层的粗糙度保持不变，因此可以得出结论，增强的拒液性源于低表面能。在环境温度下暴露于空气 6 个月后，改性表面仍保持其双疏性。最终，腐蚀行为评估表明，与纯钴涂层相比，改性涂层通过将腐蚀电流密度降低了 82%，从而增强了腐蚀抑制。其中通过氟化溶液改性后，甘油和辛烷的 CA 分别增加到 141°和 130°。AFM 结果表明改性涂层的粗糙度保持不变，因此可以得出结论，增强的拒液性源于低表面能。在环境温度下暴露于空气 6 个月后，改性表面仍保持其双疏性。最终，腐蚀行为评估表明，与纯钴涂层相比，改性涂层通过将腐蚀电流密度降低了 82%，从而增强了腐蚀抑制。其中通过氟化溶液改性后，甘油和辛烷的 CA 分别增加到 141°和 130°。AFM 结果表明改性涂层的粗糙度保持不变，因此可以得出结论，增强的拒液性源于低表面能。在环境温度下暴露于空气 6 个月后，改性表面仍保持其双疏性。最终，腐蚀行为评估表明，与纯钴涂层相比，改性涂层通过将腐蚀电流密度降低了 82%，从而增强了腐蚀抑制。因此得出结论，增强的拒液性源于低表面能。在环境温度下暴露于空气 6 个月后，改性表面仍保持其双疏性。最终，腐蚀行为评估表明，与纯钴涂层相比，改性涂层通过将腐蚀电流密度降低了 82%，从而增强了腐蚀抑制。因此得出结论，增强的拒液性源于低表面能。在环境温度下暴露于空气 6 个月后，改性表面仍保持其双疏性。最终，腐蚀行为评估表明，与纯钴涂层相比，改性涂层通过将腐蚀电流密度降低了 82%，从而增强了腐蚀抑制。