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首页> 外文期刊>Colloids and Surfaces, A. Physicochemical and Engineering Aspects >Adsorption and inhibition effect of tetraaza-tetradentate macrocycle ligand and its Ni (II), Cu (II) complexes on the corrosion of Cu10Ni alloy in 3.5% NaCl solutions
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Adsorption and inhibition effect of tetraaza-tetradentate macrocycle ligand and its Ni (II), Cu (II) complexes on the corrosion of Cu10Ni alloy in 3.5% NaCl solutions

机译：四氮杂型大环烯烃配体及其Ni（II），Cu（II）复合物对3.5％NaCl溶液Cu10Ni合金腐蚀的吸附和抑制作用

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摘要

In an attempt to search for high performance, effective and ecofriendly corrosion inhibitors, the macrocyclic compartmental ligand: (2E)-3,6,10,13-tetramethyl-2,7,9,14-tetraaza-1,8(1,4)dibenzena cyclotetradecaphane2,6,9,13-tetraene (PDHDH) and its Ni (II), Cu (II) complexes have been synthesized and characterized by elemental and spectroscopic techniques. For corrosion inhibition studies of Cu10Ni alloy, different concentrations of synthesized inhibitors were added to 3.5 % NaCl as corrosive media and surveyed by potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The surface of alloy samples treated with these inhibitors was analyzed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) to confirm the existence of adsorbed protected film. PDP curves showed that the PDHDH and its Ni (II), Cu (II) complexes behave as mixed type inhibitors. The data demonstrated that the synthesized inhibitors could assist as active inhibitors for Cu10Ni alloy corrosion in 3.5 % NaCl solutions and their protection capacity reached to 95.7 % at 100 mu M additive concentration. The synthesized inhibitors obey Freundlich adsorption isotherm, furthermore, the adsorption of these inhibitors on Cu10Ni is physisorption. DFT calculations, Fukui indices, Mulliken atomic charges and molecular electrostatic potential (MEP) mapping were accomplished to support the adsorption features and the corrosion inhibition mechanism of the investigated inhibitors.
机译：为了寻找高效、高效、环保的缓蚀剂，我们合成了大环间隔配体：（2E）-3,6,10,13-四甲基-2,7,9,14-四氮杂-1,8（1,4）二苯并环十四烷2,6,9,13-四烯（PDHDH）及其Ni（II）、Cu（II）配合物，并用元素和光谱技术对其进行了表征。为了研究Cu10Ni合金的缓蚀性能，将不同浓度的合成缓蚀剂添加到3.5%的NaCl中作为腐蚀介质，并通过动电位极化（PDP）、电化学阻抗谱（EIS）和电化学频率调制（EFM）技术进行测量。用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）分析了经这些抑制剂处理的合金样品的表面，以确认吸附保护膜的存在。PDP曲线表明，PDHDH及其Ni（II）、Cu（II）配合物具有混合型抑制剂的性能。结果表明，合成的缓蚀剂对Cu10Ni合金在3.5%NaCl溶液中的腐蚀有一定的缓蚀作用，在100μM添加剂浓度下，缓蚀剂的缓蚀能力可达95.7%。合成的缓蚀剂符合Freundlich吸附等温线，而且这些缓蚀剂在Cu10Ni上的吸附是物理吸附。通过DFT计算、Fukui指数、Mulliken原子电荷和分子静电势（MEP）作图来支持所研究的缓蚀剂的吸附特性和缓蚀机理。

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