Developing a novel imine derivative as a corrosion inhibitor for Q235 carbon steel in 1 M HCl solution: Experiments and theoretical calculations

• Published in: Materials today communications Vol. 40; p. 109693
• Main Authors: Fang, Zheng, Fu, Shaopeng, Peng, Yichun, Yang, Xingyao, Sun, Qinghao, Li, Pangang, Ma, Hongmei, Zhang, Rongling, Liang, Zezhou, Li, Jianfeng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.08.2024
• Subjects: Corrosion inhibitors; HCl; Naphthylamine derivatives; Q235; HCl; Naphthylamine derivatives; Corrosion inhibitors; Q235
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2024.109693

During oil and gas extraction, metals are inevitably exposed to acidic environments on a regular basis. Acid solutions, particularly hydrochloric acid, are employed in a multitude of industrial processes, including oil well acidising, steel pickling, ferroalloy pickling and acid cleaning. These applications frequently result in severe metal corrosion. To cope with corrosion, the superlative simple and effective method is to prevent corrosion inhibitors. Naphthyridinimides are not as effective as rust inhibitors, but their corrosion inhibition is significantly improved by the addition of Br ions. This thesis focuses on the synthesis of naphthylimine-type novel organic corrosion inhibitors and the corrosion inhibition mechanism, with the main content of 3,3′-(1,3,6,8-tetraoxo-1,3 6,8-tetrahydrobenzo[lmn] [3,8] phenanthroline-2,7-diyl) bis (N-ethyl -N, N-Dimethyl-1-propylamine) bromide (NDI-N-Br) on Q235 carbon steel in an acidic environment (1 M hydrochloric acid solution). The corrosion inhibition efficiencies of NDI-N-Br reached 93.53 % at 300 ppm at an ambient temperature of 298 K. The corrosion inhibitor NDI-N-Br forms a protective film on the metal surface and organizes the interaction between the metal matrix and the corrosive medium, providing a rust inhibiting effect. This thesis shows that this class of compounds can be well applied to acidic environments and provide ideas for the subsequent development of naphthylimide-based organic corrosion inhibitors. [Display omitted] •In modelling the corrosion inhibition of NDI-N-Br on Q235 steel in a 1 M HCL solution.•The results showed that increasing the concentration of NDI-N-Br resulted in an inhibition efficiency of up to 94.08%.•NDI-N-Br adsorbs to the surface of Q235 steel to form a film that prevents the approach of aggressive solution.•The mechanism of corrosion inhibition by NDI-N-Br was explained using DFT and MD simulations.