Loto Roland Tolulope
Department of Mechanical Engineering, Covenant University, Ota, Ogun State, Nigeria.
Sci Rep. 2017 Dec 14;7(1):17555. doi: 10.1038/s41598-017-17867-0.
The synergistic properties of the combined admixture of benzenecarbonitrile and 5-bromovanillin (BNV) on the corrosion resistance of 1018 carbon steel in 1 M HCl was analysed with potentiodynamic polarization technique, weight loss method, micro-analytical studies and ATF-FTIR spectroscopy. Results obtained show the admixed organic compound was effective with optimal corrosion inhibition values of 99.33% and 90.34% at 1.25% BNV concentration from both electrochemical methods due to the effective inhibition action and passivation characteristics of the protonated inhibitor molecules in the acid solution. Primary amines, stretch alkyl halides and C-H triple bond functional groups of the molecules were observed to actively adsorb during the corrosion inhibition reaction from ATF-FTIR spectroscopic analysis. Calculations from thermodynamic evaluation confirmed cationic adsorption mechanism to be chemisorption obeying the Langmuir and Frumkin adsorption isotherm. Micro-analytical observations of the inhibited carbon steel morphology significantly contrast the unprotected steel due to visible surface deterioration and presence of micro/macro-pits. The organic derivatives showed mixed type inhibition reactions.
采用动电位极化技术、失重法、微观分析研究和衰减全反射傅里叶变换红外光谱（ATF-FTIR），分析了苯甲腈与5-溴香草醛（BNV）的复合混合物对1018碳钢在1 M盐酸中耐腐蚀性的协同性能。所得结果表明，由于质子化抑制剂分子在酸性溶液中的有效抑制作用和钝化特性，从两种电化学方法来看，在1.25% BNV浓度下，混合有机化合物具有有效的缓蚀作用，最佳缓蚀率分别为99.33%和90.34%。通过ATF-FTIR光谱分析观察到，分子中的伯胺、仲烷基卤化物和C-H三键官能团在缓蚀反应过程中积极吸附。热力学评估计算证实，阳离子吸附机制为遵循朗缪尔和弗鲁姆金吸附等温线的化学吸附。由于可见的表面劣化以及微/宏观凹坑的存在，对缓蚀碳钢形态的微观分析观察结果与未防护的碳钢形成了显著对比。有机衍生物表现出混合型缓蚀反应。
