2,3,5-Triphenyl-2H-tetrazolium Chloride and 2,4,6-Tri（2-pyridyl）-s-triazine on the Corrosion of Mild Steel in HCl

Electrochemical measurement, quantum chemical method, and scanning electron microscopy （SEM） were performed to investigate the inhibitive effect of 2,3,5-triphenyl-2H-tetrazolium chloride （TTC） and 2,4,6-tri（2-pyridyl） -s-triazine（TPT） on the corrosion of mild steel in lmol.L^-1 HCl at room temperature. Impedance spectroscopy measurement showed that the polarization resistance increased and that double layer capacitance decreased with the increase in the inhibitive concentration, and the results of potentiodynamic polarization showed that the inhibitors suppressed both cathodic and anodic processes of steel corrosion without change in the mecha-nism. Higher the orbital density distribution strength of the lowest unoccupied molecular orbital, higher is the molecule dipole, and lower energy gap between the energy of the highest occupied molecular orbital and the energy of the lowest unoccupied molecular orbital resulted in higher inhibitory efficiency. The results of SEM analysis showed that the metal-was protected from aggressive corrosion by the addition of TTC and TPT.     

基于L-半胱氨酸/壳聚糖修饰的L-抗坏血酸电化学传感器的研究

通过将壳聚糖和L-半胱氨酸修饰到玻碳电极基底表面,制备了一种新型的电化学传感器,并将此传感器应用于对L-抗坏血酸的测定。通过循环伏安法和交流阻抗法对该传感器的电化学特性作了表征。通过线性伏安实验发现:L-抗坏血酸的氧化峰电流与其浓度在1.0×10-5~2.0×10-3mol/L范围内成良好的线性关系,检出限为4.3×10-6mol/L,且该传感器具有良好的重现性和稳定性,并将此传感器成功应用于对维生素C药片中L-抗坏血酸含量的检测。     

1mol/L HCl中不同浓度维生素B1和B6对碳钢的缓蚀性能及机理

通过研究盐酸硫胺(维生素B1),吡哆醇(维生素B6)作为缓独剂对碳钢的缓蚀行为及其作用机制,可为新型环境友好缓蚀剂的开发和应用提供一定的理论基础.利用失重法、极化曲线法和交流阻抗法、量子化学方法研究了不同浓度维生素B1和B6在1mol/L盐酸溶液中对Q235碳钢的缓蚀性能及机理.结果表明:碳钢的腐独速率随缓性剂浓度的增...     

干湿循环条件下有机涂层/碳钢的电化学阻抗谱等效电路模型的建立与解析

研究干湿循环条件下有机涂层/金属电极的队抗模型对于理解浪溅区钢铁设施的失效速率加快现象具有重要意义.在室内模拟干湿循环条件,采用电化学阻抗谱方法研究了30个干湿循环下醇酸铁红涂层/碳钢电极在3.5% NaCl溶液中的失效过程,建立了涂层失效在不同阶段的4种等效电路模型,解析了涂层电容及涂层电阻2个参数在30个循环周期内...     

环丙沙星、诺氟沙星、氧氟沙星在1 mol·L~(-1) HCl中对碳钢的缓蚀性能及机理研究(英文)

The inhibiting effect of ciprofloxacin,norfloxacin and ofloxacin on the corrosion of mild steel in 1 mol·L-1 HCl and the mechanism were studied at different temperatures using mass loss measurement,electrochemical method,and X-ray photoelectron spectroscopy(XPS) .Effective inhibition was shown by mass loss,potentiodynamic polarization and impedance spectroscopy measurement.The corrosion rate of the metal in the mass loss measurement,and the corrosion reaction on cathode and anode in the electrochemical measurement were accelerated when temperature was increased.XPS results showed that the inhibitors adsorbed effectively on the metal surface.     

喹诺酮药品对Q235钢在HCl溶液中缓蚀性能的影响

用失重法、极化曲线和交流阻抗等方法研究了喹诺酮类药品(诺氟沙星、氧氟沙星)对在1mol/L HCl溶液中的Q235钢的缓蚀性能和作用机理的影响.结果表明,所研究的两种喹诺酮类药品均具有较好的缓蚀性能,二者在有效浓度为3.5mmol/L时对碳钢的缓蚀效率分别为95%、92%,二者均为阳极抑制为主的的混合抑制型缓蚀剂.同时,还考察了温度对两种缓蚀剂的缓蚀性能的影响,结果是温度的升高不利于其缓蚀作用的发挥.