Oil‐Based Self‐Healing Barrier Coatings: To Flow and Not to Flow,Advanced Functional Materials

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Oil‐Based Self‐Healing Barrier Coatings: To Flow and Not to Flow
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-10-09 , DOI: 10.1002/adfm.201906273
Zhilong Yu ₁ , Alane T. O. Lim ₁ , Shannon L. Kollasch ₁ , Hee Dong Jang ₂ , Jiaxing Huang ₁

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Localized corrosion involves the selective attack of a metal at a small, exposed site. This can be particularly devastating for load‐bearing structures, which can fail catastrophically even with very little material loss. Unfortunately, local corrosion is difficult to prevent, predict, and detect. Corrosion can be prevented by barrier coatings, however, imperfections such as pinholes and scratches, can expose small areas of metal and eventually lead to localized corrosion. Herein, a new strategy for self‐healing, damage‐tolerant coatings that can mitigate localized corrosion is presented. The new self‐healing system consists of microcapsule‐thickened low‐viscosity oil and exhibits length scale‐dependent viscosity. Macroscopically, the coating is viscous due to the formation of a 3D particle network, which allows it to stick to vertical metal surfaces against gravity and turbulent flow. Microscopically, the oil exhibits low viscosity and can rapidly flow to damaged areas to re‐establish the particle network. The coating exhibits remarkable barrier properties and protects metal from corrosion for a long time. Moreover, the coating is able to repeatedly self‐heal over the same area hundreds of times over. The strategy described here illustrates how contradicting material properties (e.g., viscosity) co‐exist in a “smart” material system by accommodating them at different length scales.

中文翻译：

油基自修复屏障涂料：流动但不流动

局部腐蚀涉及在较小的裸露位置选择性腐蚀金属。对于承重结构而言，这尤其是毁灭性的，即使材料损失很少，承重结构也可能发生灾难性的故障。不幸的是，局部腐蚀很难预防，预测和检测。可以通过阻隔涂层来防止腐蚀，但是，诸如针孔和划痕之类的缺陷会暴露出小面积的金属，并最终导致局部腐蚀。本文提出了一种可以减轻局部腐蚀的自愈，耐损伤涂层的新策略。新的自修复系统由微胶囊增稠的低粘度油组成，并具有取决于长度的粘度。在宏观上，由于3D粒子网络的形成，涂层是粘稠的，这使其可以抵抗重力和湍流而粘在垂直的金属表面上。从微观上讲，该油的粘度低，可以迅速流到受损区域以重新建立颗粒网络。该涂层具有出色的阻隔性能，可长时间保护金属免受腐蚀。此外，涂层能够在同一区域重复自我修复数百次。此处描述的策略说明了通过在不同的长度范围内容纳“智能”材料系统中矛盾的材料特性（例如，粘度）如何共存。此外，涂层能够在同一区域重复自我修复数百次。此处描述的策略说明了通过在不同的长度范围内容纳“智能”材料系统中矛盾的材料特性（例如，粘度）如何共存。此外，涂层能够在同一区域重复自我修复数百次。此处描述的策略说明了通过在不同的长度范围内容纳“智能”材料系统中矛盾的材料特性（例如，粘度）如何共存。

更新日期：2020-01-11

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