Quites Rodrigues Diulia, Ghorbani Mahdi, Soto Puelles Jhonatan, Crawford Simon, Paulis Maria, Forsyth Maria, Somers Anthony E
POLYMAT, Kimika Fakultatea, Kimika Aplikatua Saila, University of the Basque Country UPV/EHU, Joxe Mari Korta Center, Avda. Tolosa 72, Donostia-San Sebastián 20018, Spain.
Institute for Frontier Materials, Deakin University, Burwood, Victoria 3125, Australia.
ACS Omega. 2025 Apr 30;10(18):18225-18237. doi: 10.1021/acsomega.4c07098. eCollection 2025 May 13.
Protection of mild steel from acidic solutions used in the industry by environmentally friendly methods is an area of need. This work explores the anticorrosive properties of cetrimonium cinnamate compounds for mild steel in acid solutions as an additive in solution and as a pigment in a low-volatility organic compound (VOC) coating. Immersion tests show that protection is considerably enhanced after 24 h, at pH 1 for the control being 330 μA/cm compared to 4.3 μA/cm for CTA-MeOcinn, suggesting synergy between the cetrimonium cation and cinnamate anion systems. NMR and cryo-transmission electron microscopy (cryo-TEM) suggested entrapment of the cinnamate within the cetrimonium micelles. This is further supported by molecular dynamics (MD) simulations, which also show that the carboxylate groups on the cinnamate protrude from the cetrimonium micelles, enhancing the attachment to the surface. The inhibitors are incorporated into waterborne polymeric coatings and tested in solutions at pH 1. Electrochemical impedance spectroscopy (EIS) data show that the inhibitors form a protective barrier, significantly increasing pore and charge transfer resistances for the coating, thus demonstrating the use of safe methods to protect mild steel in acidic conditions.
采用环保方法保护工业中使用的酸性溶液中的低碳钢是一个迫切需要解决的领域。这项工作探索了十六烷基三甲基氯化铵肉桂酸盐化合物在酸性溶液中作为溶液添加剂和低挥发性有机化合物（VOC）涂层中的颜料对低碳钢的防腐性能。浸泡试验表明，24小时后保护效果显著增强，在pH值为1时，对照组的电流密度为330μA/cm，而十六烷基三甲基氯化铵-甲氧基肉桂酸盐（CTA-MeOcinn）的电流密度为4.3μA/cm，这表明十六烷基三甲基氯化铵阳离子和肉桂酸盐阴离子体系之间存在协同作用。核磁共振（NMR）和低温透射电子显微镜（cryo-TEM）表明肉桂酸盐被包裹在十六烷基三甲基氯化铵胶束中。分子动力学（MD）模拟进一步支持了这一点，模拟还表明肉桂酸盐上的羧基从十六烷基三甲基氯化铵胶束中突出，增强了与表面的附着。将抑制剂加入水性聚合物涂层中，并在pH值为1的溶液中进行测试。电化学阻抗谱（EIS）数据表明，抑制剂形成了一个保护屏障，显著增加了涂层的孔隙电阻和电荷转移电阻，从而证明了使用安全方法在酸性条件下保护低碳钢的可行性。
