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Corrosion inhibition effect of a benzimidazole derivative on heat exchanger tubing materials during acid cleaning of multistage flash desalination plants
Desalination ( IF 9.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.desal.2019.114283
Ikenna B. Onyeachu , Moses M. Solomon , Saviour A. Umoren , Ime B. Obot , Ahmad A. Sorour

Abstract A benzimidazole derivative, 2-(2-bromophenyl)-1-methyl-1H-benzimidazole (2BPB) has been studied as a corrosion inhibitor for Cu-Ni 70/30 and 90/10 alloys in 1 mol/dm3 HCl solution at low and high temperatures using the weight loss, electrochemical (potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), & cyclic voltammetry (CV)), and surface characterization (scanning electron microscopy (SEM) & Fourier-transform infrared spectroscopy (FTIR)) techniques. The effect of immersion time (up to 72 h) and addition of iodide ions on the inhibition efficiency of 2BPB have also been investigated. At low temperature, 1.0 g/L 2BPB inhibits Cu-Ni 70/30 and 90/10 alloys by 88.9 ± 4.8% and 57.5 ± 1.3%, respectively. The performance of 2BPB improves with increase in immersion time and addition of iodide ions but slightly depreciates with rise in temperature. 2BPB acts as a mixed type corrosion inhibitor and adsorbs on the alloys surfaces through physical adsorption mechanism. SEM and FTIR results confirm the adsorption of 2BPB on the alloys surfaces. 2BPB is a potential low toxic candidate for the formulation of acid corrosion inhibitor for Cu-Ni alloys.

中文翻译:

多级闪蒸淡化厂酸洗过程中苯并咪唑衍生物对换热器管材的缓蚀作用

摘要 苯并咪唑衍生物 2-(2-溴苯基)-1-甲基-1H-苯并咪唑 (2BPB) 在 1 mol/dm3 HCl 溶液中作为 Cu-Ni 70/30 和 90/10 合金的缓蚀剂进行了研究。使用失重、电化学(动电位极化 (PDP)、电化学阻抗谱 (EIS) 和循环伏安法 (CV))和表面表征(扫描电子显微镜 (SEM) 和傅立叶变换红外光谱 (FTIR) )) 技术。还研究了浸泡时间(最多 72 小时)和添加碘离子对 2BPB 抑制效率的影响。在低温下,1.0 g/L 2BPB 对 Cu-Ni 70/30 和 90/10 合金的抑制率分别为 88.9 ± 4.8% 和 57.5 ± 1.3%。2BPB 的性能随着浸泡时间的增加和碘离子的加入而提高,但随着温度的升高而略有下降。2BPB 作为混合型缓蚀剂,通过物理吸附机制吸附在合金表面。SEM 和 FTIR 结果证实了 2BPB 在合金表面的吸附。2BPB 是用于配制 Cu-Ni 合金酸腐蚀抑制剂的潜在低毒候选物。
更新日期:2020-04-01
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