Corrosion Inhibition of Mild Steel by Cetrimonium trans-4-Hydroxy Cinnamate: Entrapment and Delivery of the Anion Inhibitor through Speciation and Micellar Formation,The Journal of Physical Chemistry Letters

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Corrosion Inhibition of Mild Steel by Cetrimonium trans-4-Hydroxy Cinnamate: Entrapment and Delivery of the Anion Inhibitor through Speciation and Micellar Formation
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-11-10 , DOI: 10.1021/acs.jpclett.0c02389
Mahdi Ghorbani ₁ , Jhonatan Soto Puelles ₁ , Maria Forsyth ₁ , Rainier A. Catubig ₁ , Leigh Ackland ₁ , Laura Machuca ₂ , Herman Terryn ₃ , Anthony E. Somers ₁

Affiliation

Chemical inhibitors are widely used to protect metallic alloys from corrosion in aqueous environments. This Letter investigates the possible synergistic behavior of a quaternary ammonium carboxylate compound toward the development of a new system taking advantage of the surface activity of a known antimicrobial surfactant molecule, hexadecyl trimethylammonium cation, combined with a known organic corrosion inhibitor, the trans-4-hydroxy-cinnamate anion. Short-term potentiodynamic polarization (PP) studies combined with immersion in aqueous chloride solutions demonstrated the high inhibition efficiency of the combination of ions, and NMR pfg-diffusion measurements revealed micellar formation that was concentration- and pH-dependent. The NMR data suggest that speciation changes occur in the solution that correlate with enhanced corrosion inhibition efficiency at higher pH and at concentrations above the CMC of the compound. This new contribution may provide a rational molecular design toward delivering corrosion inhibitors to a metal surface through controlled speciation in solution.

中文翻译：

低碳钢的缓蚀十六烷基三甲基反式-4-羟基肉桂：圈套，并通过形态和胶束形成阴离子抑制剂的交付

化学抑制剂广泛用于保护金属合金在水环境中不受腐蚀。这封信调查了羧酸季铵盐化合物对新系统的开发可能的协同作用，该系统利用了已知的抗菌表面活性剂分子十六烷基三甲基铵阳离子与已知的有机腐蚀抑制剂反式结合，-4-羟基肉桂酸酯阴离子。短期电位动力学极化（PP）研究与浸入氯化物水溶液相结合显示了离子组合的高抑制效率，而NMR pfg扩散测量表明胶束形成是浓度和pH依赖性的。NMR数据表明，在较高的pH值和高于化合物CMC的浓度下，溶液中会发生形态变化，与腐蚀抑制效率的提高相关。这一新的贡献可以为通过控制溶液中的形态将缓蚀剂输送到金属表面提供合理的分子设计。

更新日期：2020-11-19

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