Tang Mingjin, Li Jianbo, Li Zhida, Fu Luoping, Zeng Bo, Lv Jie
School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China.
Faculty of Engineering, Computer & Mathematical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.
Materials (Basel). 2019 Feb 1;12(3):449. doi: 10.3390/ma12030449.
In this paper, a corrosion inhibitor containing nitrogen atoms and a conjugated π bond was synthesised, and its final product synthesised by the optimal conditions of the orthogonal test results is named multi-mannich base (MBT). The corrosion inhibition effect on the N80 steel sheet of the corrosion inhibitor was evaluated in a CO₂ saturated solution containing 3 wt % NaCl; the corrosion rate was 0.0446 mm/a and the corrosion inhibition rate was 90.4%. Through electrochemical and adsorption theory study, MBT is a mixed corrosion inhibitor that mainly shows cathode suppression capacity. The adsorption of MBT on the surface of the steel sheet follows the Langmuir adsorption isotherm; it can be spontaneously adsorbed on the surface of the N80 steel sheet, which has a good corrosion inhibition effect. The surface of the N80 steel sheet was microscopically characterised by atomic force microscope (AFM). It can be seen from the results that the N80 steel sheet with MBT added is significantly different from the blank control group; the surface of the steel sheet is relatively smooth, indicating that MBT forms an effective protective film on the surface of N80 steel, which inhibits the steel sheet.
本文合成了一种含氮原子和共轭π键的缓蚀剂，通过正交试验结果的最优条件合成的最终产物命名为多曼尼希碱（MBT）。在含3 wt% NaCl的CO₂饱和溶液中评估了该缓蚀剂对N80钢板的缓蚀效果；腐蚀速率为0.0446 mm/a，缓蚀率为90.4%。通过电化学和吸附理论研究，MBT是一种主要表现出阴极抑制能力的混合型缓蚀剂。MBT在钢板表面的吸附遵循朗缪尔吸附等温线；它能自发吸附在N80钢板表面，具有良好的缓蚀效果。用原子力显微镜（AFM）对N80钢板表面进行微观表征。从结果可以看出，添加MBT的N80钢板与空白对照组有显著差异；钢板表面相对光滑，表明MBT在N80钢表面形成了有效的保护膜，从而对钢板起到了缓蚀作用。
