Performance Evaluation of a Novel and Effective Water-Soluble Aldehydes as Corrosion Inhibitor for Carbon Steel in Aggressive Hydrochloric Medium
  • Yun Wang1, Tiantian Wang2, Bei Wang1, Wei Chang3, Jiangli Cao1, Lihua Hu3, Minxu Lu1, Lei Zhang1,*
1 University of Science and Technology Beijing, Beijing, 100083, China
2 Wenzhou Hongfeng Electrical Alloy Co., Ltd., Wenzhou, 325603, China
3 CNOOC Research Institute, Beijing, 100028, China * Corresponding Author: Lei Zhang. Email: zhanglei@ustb.edu.cn
(This article belongs to this Special Issue:Green Coating and Film for Degeneration Protection)
Received 24 December 2020; Accepted 11 March 2021 ; Published online 22 April 2021
Abstract
A novel and effective water-soluble aldehydes (β-HA) as corrosion inhibitor was synthesized for N80 steel corrosion in 15% HCl solution, and the corrosion inhibition performance was evaluated by using weight loss, electrochemical measurements, scanning electron microscope (SEM), quantum chemical calculation and molecular dynamics simulation (MDS). The results show that synthesized β-HA showed excellent corrosion performance compared with MHB and PE for carbon steel in 15% HCl solution compared with MHB and PE, and the inhibition efficiency increased with increasing concentration of the inhibitor. The inhibition efficiency of β-HA at 8 mmol/L reached the maximum value 94.08%. The inhibitor acted as mixed-type inhibitor via blocking both the anodic and cathodic reaction. The adsorption of inhibitors on N80 steel surface obeyed Langmuir adsorption isotherm, and the process contained chemisorption and physisorption. The ΔGads of β-HA was −28.81 kJ·mol−1 under the standard atmospheric pressure. Moreover, the theoretical calculation parameters revealed stronger combination and higher interaction energy for inhibitor β-HA comparing with MHB and PE, further demonstrating the correlation between the theoretical and experimental results.
Keywords
Corrosion; inhibitors; n80 steel; electrochemical; adsorption; molecular dynamics simulation