Li Manzhi, Liu Feifei, Mou Fen, Guo Zhe, Wang Weiwei, Zeng Yongming, Sim Ley Boon, Chen Binghui
Xinjiang Key Laboratory of High Value Green Utilization of Low-rank Coal, School of Chemistry and Chemical Engineering, Changji University, Changji, Xinjiang 831100, PR China.
School of Energy and Chemical Engineering, Xiamen University Malaysia, Jalan Sunsuria, Bandar Sunsuria, Sepang 43900, Malaysia.
ACS Omega. 2025 Jun 5;10(23):24628-24641. doi: 10.1021/acsomega.5c01412. eCollection 2025 Jun 17.
A phenanthroline derivative, [1,2,5]-oxadiazolo-[3',4':5,6]-pyrazino-[2,3-]-[1,10]-phenanthroline (OPP), was synthesized and evaluated for corrosion inhibition on mild steel in a mixed acid solution of 1 mol/L HCl and 0.5 mol/L HSO. OPP achieves 99.53% efficiency at 20 °C and sustains above 86% up to 60 °C. The polarization curve shows that OPP reduces current densities at less negative potentials, with shifting less than 85 mV versus the control, indicating primary anodic protection as a mixed inhibitor. OPP shows a 10-fold increase in charge transfer resistance compared to the control as measured through EIS, demonstrating that it creates a substantial challenge to electron loss from Fe. SEM and AFM confirm that OPP alleviates the damage of acid on the steel surface. OPP adheres to the Langmuir model and chemisorption mode. XPS and EDS register OPP-iron complex formations and uniform nitrogen distribution, respectively, indicating successful OPP adsorption. OPP retains around 98 and 85% efficiency after 10 cycles at 20 and 60 °C, respectively, indicating good stability even at high temperatures. Quantum chemical results further suggest strong OPP-steel interactions, with low potential for localized corrosion and optimal adsorption geometry for robust bonding (-10.59 eV adsorption energy).
合成了一种菲咯啉衍生物，即[1,2,5]-恶二唑并-[3',4':5,6]-吡嗪并-[2,3-]-[1,10]-菲咯啉（OPP），并评估了其在1 mol/L HCl和0.5 mol/L H₂SO₄混合酸溶液中对低碳钢的缓蚀性能。OPP在20℃时的缓蚀效率达到99.53%，在60℃时仍保持在86%以上。极化曲线表明，OPP在较负电位下降低了电流密度，相对于对照，其电位偏移小于85 mV，表明作为混合型缓蚀剂起主要阳极保护作用。通过电化学阻抗谱（EIS）测量，与对照相比，OPP的电荷转移电阻增加了10倍，这表明它对铁的电子损失造成了很大阻碍。扫描电子显微镜（SEM）和原子力显微镜（AFM）证实，OPP减轻了酸对钢表面的损伤。OPP符合朗缪尔模型和化学吸附模式。X射线光电子能谱（XPS）和能谱仪（EDS）分别记录到了OPP-铁络合物的形成和氮的均匀分布，表明OPP成功吸附。OPP在20℃和60℃下经过10个循环后，缓蚀效率分别保持在98%和85%左右，表明即使在高温下也具有良好的稳定性。量子化学结果进一步表明，OPP与钢之间存在强烈的相互作用，局部腐蚀的可能性较低，且具有用于牢固键合的最佳吸附几何结构（吸附能为-10.59 eV）。
