In the present study, hexamethylene diisocyanate (HMDI) encapsulated poly-thiourea formaldehyde (PTF) (10 wt%) coating was developed in an epoxy-polyamine matrix and their anticorrosion studies on Type SS304 stainless steel substrate have been conducted using electrochemistry techniques. The compact and hydrophobic shell wall of PTF proved to be a potent shell wall material for HMDI encapsulation. The effect of temperature and pH values was found to be decisive factor in the synthesis of microcapsules. The PTF microcapsules were synthesized in acidic condition with a pH value of 3. Over 90% of the core fraction is retained in water after 21 days immersion. However, core content decreased with increasing temperature. The capsules were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and Electrochemical Impedance spectroscopy (EIS). Scanning electron microscopic analysis depicts the uniform morphology of coating with a particle size in the range of 1.08 μm–22.06 μm. The vibrational band at 2271 cm⁻¹ attributed to NCO signal further endorses the successful encapsulation of HMDI into the PTF capsules. Electrochemical testing on steel specifies the appreciable anticorrosion performance of the synthesized poly thiourea formaldehyde (PTF) coating against artificial sea water.

在本研究中，在环氧-多胺基体中开发了六亚甲基二异氰酸酯（HMDI）封装的聚硫脲甲醛（PTF）（10 wt％）涂层，并使用电化学技术对SS304型不锈钢基材进行了防腐研究。PTF的致密且疏水的壳壁被证明是用于HMDI封装的有效壳壁材料。发现温度和pH值的影响是微胶囊合成中的决定性因素。在酸性条件下，pH值为3合成PTF微囊。浸泡21天后，超过90％的核心部分保留在水中。但是，芯含量随温度升高而降低。通过傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM）对胶囊进行了表征，热重分析（TGA）和电化学阻抗谱（EIS）。扫描电子显微镜分析显示了粒径在1.08 μm–22.06μm范围内的涂层的均匀形态。在2271厘米处的振动带归因于NCO信号的^-1进一步支持将HMDI成功封装到PTF胶囊中。在钢上进行的电化学测试规定了合成的聚硫脲甲醛（PTF）涂层对人造海水的显着防腐性能。