Nageeb Mona M, Gaber Ghalia A, Ahmed Amal S I, Fouda Abd El Aziz S
Department of Chemistry, Faculty of Science (Girls), Al-Azhar University Nasr City Cairo Egypt.
Department of Chemistry, Faculty of Science, Mansoura University Mansoura-35516 Egypt
RSC Adv. 2024 Sep 3;14(38):28044-28057. doi: 10.1039/d4ra04758c. eCollection 2024 Aug 29.
Weight loss (WL), electrochemical, and surface analysis were used to explore the efficiency of lentil seed extract (LSE) in mitigating the electrochemical corrosion of Cu-10Ni and Cu-30Ni alloys in obviously aerated water. The adsorption of lentil seed extract (LSE) species to create a barrier layer improved the corrosion resistance of Cu-Ni alloys in a NaCl medium. It was shown that the temperature of the medium and the amount of extract used affected the enhanced inhibitory efficacy. Using the PDP approach, the Cu-10Ni alloy showed the maximum inhibition performance (IE) of about 98.58% and 8.53% with 300 ppm LSE, respectively. According to the findings, the studied extract had a good ability to slow down the step at which alloys corroded in a 3.5% NaCl solution. It was discovered that as the temperature rose, the rate of corrosion increased. The thermodynamic activation functions of the dissolution process were also calculated as a function of extract dose. PDP curve analysis reveals that LSE is a mixed-type inhibitor, and EIS findings demonstrates that increasing dose not only alters the charge transfer ( ) of Cu-10Ni alloy from 1031 to 2984 Ω cm and for Cu-N30Ni alloy from 3093-6208 Ω cm but also changes the capacitance of the adsorbed double layer ( ) for Cu-10Ni alloy from 728-678 μF cm and for Cu-30 Ni alloy from 726 to 701 μF cm. The inhibitor's adsorption provides a good fit for the "Freundlich, Temkin, and Langmuir isotherm" models. Several methods are used to confirm that the alloy surface has a protective coating.
采用失重法（WL）、电化学法和表面分析法，探究了小扁豆籽提取物（LSE）在明显曝气水中缓解Cu-10Ni和Cu-30Ni合金电化学腐蚀的效率。小扁豆籽提取物（LSE）物种的吸附形成了一个阻挡层，提高了Cu-Ni合金在NaCl介质中的耐腐蚀性。结果表明，介质温度和提取物用量会影响增强的抑制效果。采用动电位极化（PDP）方法，Cu-10Ni合金在300 ppm LSE时分别显示出约98.58%和8.53%的最大抑制性能（IE）。根据研究结果，所研究的提取物具有良好的减缓合金在3.5% NaCl溶液中腐蚀步骤的能力。研究发现，随着温度升高，腐蚀速率增加。还计算了溶解过程的热力学活化函数与提取物剂量的关系。PDP曲线分析表明LSE是一种混合型缓蚀剂，电化学阻抗谱（EIS）结果表明，增加剂量不仅会改变Cu-10Ni合金的电荷转移电阻（ ）从1031到2984 Ω·cm，以及Cu-30Ni合金的电荷转移电阻从3093 - 6208 Ω·cm，还会改变Cu-10Ni合金吸附双层电容（ ）从728 - 678 μF/cm²，以及Cu-30Ni合金的吸附双层电容从726到701 μF/cm²。缓蚀剂的吸附对“Freundlich、Temkin和Langmuir等温线”模型拟合良好。采用多种方法证实合金表面有一层保护膜。
