Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar, P C-311, Oman.
Chemical Engineering Section, Faculty of Engineering, Sohar University, Sohar, P C-311, Oman.
Chemosphere. 2022 Mar;291(Pt 3):132756. doi: 10.1016/j.chemosphere.2021.132756. Epub 2021 Nov 5.
The eco-friendly plant extract based corrosion inhibitor, synthesized using Ziziphus spina-christi, was investigated for its corrosion control and surface protection potential for carbon steel under acidic conditions. The influence of process parameters, corrosion inhibitor concentration (160-810 ppm), operating temperature (330.15-315.15 K) and immersion time (4-24 h), on inhibition efficiency was evaluated. Based on mass loss experiments, the maximum inhibition efficiency achieved was found to be 91.35% at 810 ppm inhibitor concentration and 300.15 K. Corrosion rate decreased with increase in inhibitor dose which could be due to enhanced surface coverage. The activation energy associated with this process indicated surface interaction as the main mechanism and positive values of enthalpy change confirmed the endothermic nature. The electrochemical parameters, namely corrosion potential (E), anodic and cathodic Tafel constants (β and β), and corrosion current density (i) were calculated, and the inhibitor was found to be mixed type. Through double-layer capacitance, the increase in corrosion resistance was proved. The active functional groups associated with corrosion inhibitor were identified.
以枣(Ziziphus spina-christi)为原料合成的环保型植物提取物缓蚀剂，研究了其在酸性条件下对碳钢的缓蚀作用和表面保护性能。考察了工艺参数（缓蚀剂浓度 160-810ppm、操作温度 330.15-315.15K 和浸泡时间 4-24h）对缓蚀效率的影响。通过失重实验，在 810ppm 抑制剂浓度和 300.15K 下，最大缓蚀效率达到 91.35%。随着抑制剂剂量的增加，腐蚀速率降低，这可能是由于表面覆盖增强所致。与该过程相关的活化能表明表面相互作用是主要机制，焓变的正值证实了其吸热性质。计算了电化学参数，即腐蚀电位（E）、阳极和阴极塔菲尔常数（β和β）以及腐蚀电流密度（i），并发现该抑制剂为混合型。通过双层电容，证明了耐腐蚀性的提高。鉴定了与腐蚀抑制剂相关的活性官能团。
