Department of Chemistry, Anna University, Chennai 600 025, India.
Faculty Homi Bhaba National Institute, Water and Steam Chemistry Division, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India.
J Colloid Interface Sci. 2018 Feb 15;512:618-628. doi: 10.1016/j.jcis.2017.09.061. Epub 2017 Sep 18.
In the present investigation, the anti corrosive performance of synthesized Naphthalen-2-yl Naphthalene-2-Carboxammide (NNC) in 1 N HCl solution as corrosion inhibitor on carbon steel was studied at room temperature. Potentiodynamic polarization study revealed the mixed behavior of the inhibitor NNC along with inhibition efficiency. The inhibition efficiency of NNC increases with increasing inhibitor concentration. The electrochemical noise analysis (ENA) and electrochemical impedance spectroscopy (EIS) studies have showed that noise resistance (R) and charge transfer resistance (R) values were increased with addition of inhibitor concentrations. The synthesized and adsorbed bonds of inhibitor with the metal atom were characterized by ATR-FTIR spectroscopy. The adsorption isotherm explored that the adsorption of NNC obeyed Langmuir adsorption to bond with metal surface at carbon steel/HCl solution interface. The thermodynamic properties were calculated to discuss the adsorption mechanism of corrosion inhibition. Atomic force microscope (AFM) study showed a less corroded and roughness surface morphology, which is due to the formation of protective film layer on the surface. Quantum chemical parameters were calculated and correlated with respect to inhibitive performance of NNC. The study revealed that the adsorption nature of inhibitor has both physisorption and chemisorption phenomena.
在本研究中，研究了合成的萘基萘-2-羧酰胺（NNC）在室温下作为缓蚀剂在 1N HCl 溶液中对碳钢的缓蚀性能。动电位极化研究表明，抑制剂 NNC 具有混合行为和抑制效率。随着抑制剂浓度的增加，NNC 的抑制效率增加。电化学噪声分析（ENA）和电化学阻抗谱（EIS）研究表明，随着抑制剂浓度的增加，噪声电阻（R）和电荷转移电阻（R）值增加。通过衰减全反射傅里叶变换红外光谱（ATR-FTIR）对抑制剂与金属原子的合成和吸附键进行了表征。吸附等温线表明，NNC 的吸附遵循 Langmuir 吸附，在碳钢/HCl 溶液界面处与金属表面键合。计算了热力学性质以讨论腐蚀抑制的吸附机理。原子力显微镜（AFM）研究表明，表面形成了保护性薄膜层，表面的腐蚀程度较低，粗糙度也较低。计算了量子化学参数，并与 NNC 的抑制性能相关联。研究表明，抑制剂的吸附性质具有物理吸附和化学吸附两种现象。
