ABSTRACT

Seven analytical and electroanalytical techniques, namely gravimetric, thermometric, gasometrical, acidimetric, atomic absorption spectroscopy (AAS), potentiodynamic polarization, and electrochemical impedance spectroscopy, EIS, were applied in the determination of ferrous (Fe⁺²) ions that result from corrosion of steel in aqueous lower pH medium, in the presence and absence of omeprazole drugs as corrosion inhibitors. The effects of pH, concentration and temperature were studied; the ferrous ion (Fe⁺²) concentration and consequently the corrosion rate decreased by increasing drug concentration, while the concentration of ferrous ions (Fe⁺²) and corrosion rate increased by lowering pH and with rising temperature. Potentodynamic polarization techniques show that the used drugs act as mixed type inhibitors for steel in all studied pH values. The maximum inhibition efficiency, obtained using 300 ppm of omeprazole drugs, is 96% within the range when it is compared with the obtained efficiency in the cited references. All the used techniques are in good agreement with each other (±2%) and show that the used drugs act as green corrosion inhibitors for the steel at lower pH values.

摘要

七种分析和电分析技术，分别用于重量法，温度法，气相法，酸度法，原子吸收光谱法（AAS），电势极化法和电化学阻抗光谱法EIS ，用于测定由铁的腐蚀引起的亚铁（Fe ⁺²）离子。钢在较低pH的水性介质中，在存在和不存在奥美拉唑药物作为缓蚀剂的情况下。研究了pH，浓度和温度的影响；亚铁离子（铁²）浓度，因此腐蚀速率降低了药物浓度的增加，而亚铁离子的浓度（铁⁺²降低pH值并随温度升高而增加腐蚀速率。电位动力学极化技术表明，所用药物在所有研究的pH值中均作为钢的混合型抑制剂。与引用的参考文献中获得的效率相比，使用300 ppm的奥美拉唑药物获得的最大抑制效率在此范围内为96％。所有使用的技术彼此之间都具有良好的一致性（±2％），并表明所用的药物在较低的pH值下可作为钢的绿色缓蚀剂。