Abstract Herein, we developed a straightforward and effective method to prepare epoxy coating for the early stage corrosion-detection of copper alloy. A selective “turn-on” chemosensor derived from rhodamine B for Cu(II), 3′,6′-Bis(diethylamino)-2-[[(2-hydroxyphenyl)methylene]amino]spiro[1H-isoindole-1,9′-[9H]xanthen]-3(2H)-one (RHS), was obtained via a two-step synthesis of acylation and schiff-base reaction. Both the colorimetric and fluorescent signals of the typical 0.5 wt% sensor-doped coating was observed, which showed that the area prior to corrosion was no significant damage. The concentration of RHS could be reduced to 0.14 wt%, after the zinc-based metal–organic framework (MOF) particle, ZIF-8, applied as a nanocontainer in this coating, and the detection sensitivity was better than the coating with bare RHS. This nondestructive strategy successfully realized early-stage corrosion detection for cupronickel in epoxy coating, which could be potentially used in the corrosion detections for copper alloys.

中文翻译：

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用于早期检测铜合金腐蚀的比色/荧光双通道敏感涂层

摘要 在此，我们开发了一种简单有效的方法来制备用于铜合金早期腐蚀检测的环氧涂层。从罗丹明 B 衍生的选择性“开启”化学传感器，用于 Cu(II), 3',6'-Bis(diethylamino)-2-[[(2-hydroxyphenyl)methylene]amino]spiro[1H-isoindole-1, 9'-[9H] 黄原胶]-3(2H)-one (RHS)，通过酰化和席夫碱反应的两步合成获得。观察到典型的 0.5 wt% 传感器掺杂涂层的比色和荧光信号，这表明腐蚀前的区域没有显着损坏。将锌基金属有机骨架 (MOF) 粒子 ZIF-8 作为纳米容器应用于该涂层后，RHS 的浓度可降低至 0.14 wt%，检测灵敏度优于裸 RHS 涂层.