Production Department, Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt.
Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, 44519, Egypt.
Sci Rep. 2022 Jul 21;12(1):12483. doi: 10.1038/s41598-022-16348-3.
Incorporation of novel-prepared metal-organic complexes as crosslinking accelerators for multifunctional epoxy was on top of interest by coating formulators. The present work investigated the loading of mixed ligand metal complexes (Zr(IV) and Cu(II)) of metformin (MF) and 2.2'bipyridine (Bipy) against the free ligands as crosslinking modifiers via some epoxy coating formulations to assess their superb performances on the C-steel surface. Zr(IV) and Cu(II) demonstrated the minor energy gap (∆E) values at 0.190 au compared to free MF and Bipy according to the calculated energy values, and this behavior reflected their enhanced properties via epoxy coating applications. EIS measurements using high saline formation water as a corrosive medium were performed and offered that PA-DGEBA/MC-Cu coated film showed the superior resistance values (R = 940 and R = 930 kΩ cm). The accelerated corrosion salt spray experiment clarified that PA-DGEBA/MC-Cu coating achieved the least corrosion rate at 0.00049 mm/y and exhibited the highest protection efficiency of 99.84%. SEM/EDX combination survey affirmed the protective performance of the checked coatings. AFM microanalysis confirmed that surface-treated Cu(II) coating displayed the smoothest film surface with complete curing. Mechanical durability properties were evaluated and the obtained results illustrated that pull-off adhesion for PA-DGEBA/MC-Cu coated film fulfilled the highest adhesion strength at 6.3 MPa, the best bend character at 77, and the maximum impact resistance at 59.7 J. UV immovability trial was performed at 10 irradiance and 80 h duration. PA-DGEBA/MC-Cu coated film displayed the highest resistance to UV irradiance with blistering (#8 size and few frequencies) in addition to offering a minor gloss variation and matt properties.
将新型制备的金属有机配合物作为交联加速剂用于多功能环氧树脂是涂料配方师关注的重点。本工作研究了混合配体金属配合物（Zr(IV)和 Cu(II)）负载二甲双胍（MF）和 2.2'-联吡啶（Bipy）作为交联改性剂，通过一些环氧涂料配方，评估它们在 C 钢表面的优异性能。根据计算的能量值，Zr(IV)和 Cu(II)表现出比游离 MF 和 Bipy 更小的能隙（∆E）值（0.190 au），这种行为反映了它们通过环氧涂层应用增强的性能。使用高盐水形成水作为腐蚀性介质进行了 EIS 测量，结果表明 PA-DGEBA/MC-Cu 涂层显示出较高的电阻值（R=940 和 R=930 kΩ cm）。加速腐蚀盐雾实验表明，PA-DGEBA/MC-Cu 涂层的腐蚀速率最低，为 0.00049 mm/y，保护效率最高，为 99.84%。SEM/EDX 组合研究证实了所检查涂层的保护性能。AFM 微分析证实了表面处理的 Cu(II)涂层具有最光滑的膜表面和完全固化。机械耐久性性能进行了评估，得到的结果表明，PA-DGEBA/MC-Cu 涂层的剥离附着力最高，达到 6.3 MPa，弯曲性能最好，为 77，冲击阻力最大，为 59.7 J。进行了 10 辐照度和 80 h 持续时间的 UV 不稳定性试验。PA-DGEBA/MC-Cu 涂层显示出对 UV 辐照的最高抵抗力，仅有起泡（#8 尺寸和少量频率），同时光泽变化较小，哑光性能较好。
