ABSTRACT

The effect of different concentrations of nanoclay incorporated in the epoxy coating containing 8-hydroxyquinoline (8-HQ) on early corrosion detection, electrochemical and optical properties of the applied coating was investigated. The 8-HQ and nanoclay composite samples were characterised by UV–Vis spectroscopy, FE-SEM, EDS, XRD, EIS, fluorescence spectroscopy and microscopy. Then, the optimised coating containing 8-HQ and nanoclay was applied on the Ti–Ni conversion coated steel for further analysis. Adhesion measurements indicated that the adhesion strength of the 8-HQ + Nano + TiNiCC was 4.6 ± 0.45 MPa with dominant cohesion failure. Based on the EIS measurement, the polarisation resistance of Ti–Ni modified steel coated with 0.1 wt-% 8-HQ and 2 wt-% nanoclay composite was about 1.5 × 10¹⁰ohm.cm² even after 4 weeks immersion in 3.5 wt-% NaCl solution. During the same period as a result of fluorescence microscopic study, the fluorescent spot appeared as a result of Fe²⁺/Fe³⁺ ions production at anodic regions.

摘要

研究了在含有 8-羟基喹啉 (8-HQ) 的环氧涂层中掺入不同浓度的纳米粘土对涂层的早期腐蚀检测、电化学和光学性能的影响。8-HQ 和纳米粘土复合样品通过紫外-可见光谱、FE-SEM、EDS、XRD、EIS、荧光光谱和显微镜进行表征。然后，将含有 8-HQ 和纳米粘土的优化涂层涂覆在 Ti-Ni 转化涂层钢上进行进一步分析。附着力测量表明，8-HQ + Nano + TiNiCC 的附着强度为 4.6 ± 0.45 MPa，主要是内聚力破坏。基于 EIS 测量，涂有 0.1 wt-% 8-HQ 和 2 wt-% 纳米粘土复合材料的 Ti-Ni 改性钢的极化电阻约为 1.5 × 10 ¹⁰ ohm.cm²即使在 3.5 wt-% NaCl 溶液中浸泡 4 周后。同一时期荧光显微研究结果显示，由于阳极区产生Fe ²⁺ /Fe ³⁺离子，荧光斑点出现。