在本研究中,作者的主要目标是避免在盐水介质中的3.5%NaCl溶液对低碳钢(MS)的腐蚀性侵蚀,通过添加少量的称为配体(HL)的酰肼的新衍生物,作为缓蚀剂。这项研究是通过采用不同的电化学测量来实现的,例如,开路电位(OCP),电化学阻抗谱(EIS)和动态电位极化(PDP)方法。电化学测试(OCP)的结果,表明,低碳钢在盐溶液中的开路电位,在配体(HL)的存在下被引导到更正的方向,在其理想浓度(1×10-3M),与(OCP)相比,在没有(HL)的情况下的低碳钢。电化学方法的结果,EIS和PDP提出,配体(HL),作为一种很好的缓蚀剂,用于阻碍低碳钢在3.5%氯化钠中的腐蚀过程,因为它记录了良好的抑制效率百分比(77.45%,53.41%,分别通过EIS和PDP技术),在其最佳浓度(1×10-3M)。此外,低碳钢在盐水介质中的腐蚀速率(HL),被列出约(0.0017毫米/年),虽然存在(HL),减少到大约(0.00061毫米/年)的值。同样,(HL)的一些电性能,及其衍生物[Pd(II),Cr(III),和Ru(III)],研究了复合物,如;活化能(Ea(ac)),其中记录的值在0.02-0.44(eV)范围内,电导率在室温下列出的值在10-5-10-8S范围内。cm-1.(HL)的交流和直流电导率测量结果,及其衍生物[Pd(II),Cr(III)和Ru(III)]配合物表明半导体性质,这表明这些化合物可用于电子器件中。此外,配合物表现出比(HL)更高的电导率值。光物理研究表明,HL具有良好的荧光特性,表明它可用于通过猝灭和计算量子产率来确定大多数没有荧光特性的药物。此外,酰肼配体(HL),已显示出作为人类乳腺癌和结肠癌的活性抗癌候选药物的选择性。密度泛函理论证明,配合物的前沿分子轨道HOMO表现出相似的行为,电荷密度位于所有研究配合物的金属区域。此外,配体(HL)的能隙值,及其配合物Pd(II),Cr(III)和Ru(III),按HL>Cr(III)>Ru(III)>Pd(II)的顺序排列。报告了使用不同光谱技术进行的所有表征,以阐明所提出的结构,例如;热分析,元素分析C,H,和N个原子,使用红外光谱分析,UV,1HNMR技术,扫描电子显微镜和能量色散X射线分析。
In the present study the authors\' main goal is to avoid the corrosive attack of the chloride ions of 3.5% NaCl solution in saline medium on the mild steel (MS), by addition of small amount of a new derivative of the hydrazide called ligand (HL), as a corrosion inhibitor. This study had been achieved by employing different electrochemical measurements such as, open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentio-dynamic polarization (PDP) methods. The results of the electrochemical test (OCP), showed that, the open circuit potential of the mild steel in saline solution, was guided to more positive direction in presence of the ligand (HL), at its ideal concentration (1 × 10-3 M), compared to the (OCP), of the mild steel in absence of (HL). The results of the electrochemical methods, EIS and PDP presented that, the ligand (HL), was acted as a good corrosion inhibitor for hindering the corrosion process of the mild steel in 3.5% sodium chloride, as it was recorded a good percentage of the inhibition efficiency (77.45%, 53.41%, by EIS and PDP techniques respectively), at its optimum concentration (1 × 10-3 M). Also, the corrosion rate of the mild steel in the saline medium without (HL), was listed about (0.0017 mm/year), while in existence of (HL), was decreased to a value about (0.00061 mm/year). As well, some of electrical properties of (HL), and its derivative [Pd(II), Cr(III), and Ru(III)], complexes were investigated such as; the activation energy (Ea(ac)), which recorded values in the range of 0.02-0.44 (eV) range and electrical conductivity which listed values at room temperature in the range of 10-5-10-8 S.cm-1. The results of the AC and DC electrical conductivity measurements for (HL), and its derivative [Pd(II), Cr(III) and Ru(III)] complexes indicate semiconducting nature which suggests that these compounds could be used in electronic devices. Also, the complexes exhibited higher conductivity values than (HL). Photophysical studies showed good florescence properties of HL that indicated that it can be used to determine most of the drugs with no fluorescence properties by quenching and calculating quantum yield. Moreover, the hydrazide ligand (HL), has shown selectivity as an active anticancer candidate drug for both breast and colon cancer in humans. Density function theory demonstrated that, the frontier molecular orbital HOMOs of the complexes have exhibited similar behavior and the charge density has localized in the metallic region of all the studied complexes. Also, the values of the energy gap of the ligand (HL), and its complexes Pd(II), Cr(III) and Ru(III), had been arranged in this order HL > Cr(III) > Ru(III) > Pd(II). All characterization using different spectroscopic techniques were reported to elucidate the proposed structures such as; thermal analysis, elemental analysis of C, H, and N atoms, spectral analysis using IR, UV, 1H NMR techniques, scanning electron microscopy and energy dispersive X-ray analyses.