嵌入了包含腐蚀抑制剂的pH响应纳米胶囊的智能涂层。,ACS Applied Materials & Interfaces

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嵌入了包含腐蚀抑制剂的pH响应纳米胶囊的智能涂层。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-22 , DOI: 10.1021/acsami.9b20238
Changkyu Kim ₁ , Ahmad Ivan Karayan ₁ , Jose Milla ₂ , Marwa Hassan ₃ , Homero Castaneda ₁

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将基于胺的腐蚀抑制剂三乙醇胺（TEA）封装，然后嵌入环氧涂料中，以提供铝合金3003的长期腐蚀保护。通过自由基聚合将TEA封装，平均粒径为450 nm。由于TEA的吸附，包含10wt％的纳米胶囊的施加的环氧涂层长期成功地保护了人工缺陷区域，这导致形成了抑制层。电化学阻抗谱显示，当金属在其早期受到轻微腐蚀时，其抑制效率超过85％，并且该抑制层通过局部pH值变化而开始形成，从而触发了TEA的释放。根据扫描振动电极技术的结果，在包封的TEA涂层的情况下，金属表面的电流密度显着低于没有纳米胶囊的对照涂层的电流密度。光学显微镜和扫描电子显微镜图像显示，与对照样品相比，在60天的测试后，附近封装有TEA的样品表面的污渍明显更少，这表明金属基材受到了抑制层的保护。通过能量色散X射线光谱法进行的元素分析进一步证实金属表面被很好地保存，并且氧含量显着低表明金属的氧化被抑制。核磁共振谱还证明了在整个实验期间成功释放了TEA。

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Smart Coating Embedded with pH-Responsive Nanocapsules Containing a Corrosion Inhibiting Agent.

Triethanolamine (TEA), an amine-based corrosion inhibitor, was encapsulated and then embedded into an epoxy coating to provide long-term corrosion protection of aluminum alloy 3003. TEA was encapsulated by means of free-radical polymerization, yielding an average particle size of 450 nm. An applied epoxy coating containing 10 wt % of the nanocapsules successfully protected an artificially defective area for a long period due to TEA adsorption, which resulted in the formation of an inhibiting layer. Electrochemical impedance spectroscopy showed an inhibition efficiency surpassing 85% when the metal experienced mild corrosion in its early stages, and the inhibiting layer started to form by local pH level change, which triggered the release of TEA. On the basis of the results of a scanning vibrating electrode technique, the current density of the metal surface in the presence of an encapsulated TEA coating was significantly lower than that of the control coating with no nanocapsules. Optical microscope and scanning electron microscope images revealed that the sample surface that had encapsulated TEA nearby was considerably less stained after 60 days of testing compared with that of the control sample, which indicated that the metal substrate was protected by an inhibiting layer. Elemental analysis performed by energy-dispersive X-ray spectroscopy further confirmed that the metal surface was well preserved, and a remarkably low oxygen content indicated suppressed metal oxidation. The nuclear magnetic resonance spectra also evidenced a successful release of TEA throughout the experimental period. These findings reflected a spontaneous surface repassivation with the help of encapsulated TEA coating.

更新日期：2020-01-23

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