Development of pH-sensitive chitosan/plant extract microcapsules: Enhanced corrosion protection for carbon steel in HCl solution

Qihui Wang; Xiaofeng Sun; Ruozhou Wang; Ruby Aslam; Jinmei Zhao; Yi Sun; Zhitao Yan; Xueming Li

doi:10.1016/j.ijbiomac.2024.137461

Development of pH-sensitive chitosan/plant extract microcapsules: Enhanced corrosion protection for carbon steel in HCl solution

Int J Biol Macromol. 2024 Nov 9;282(Pt 6):137461. doi: 10.1016/j.ijbiomac.2024.137461. Online ahead of print.

Authors

Qihui Wang¹, Xiaofeng Sun², Ruozhou Wang², Ruby Aslam², Jinmei Zhao², Yi Sun³, Zhitao Yan⁴, Xueming Li⁵

Affiliations

¹ School of Mechanical and Intelligent Manufacturing, Chongqing University of Science and Technology, Chongqing 401331, China; School of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, China; Chongqing Key Laboratory of Energy Engineering Mechanics & Disaster Prevention and Mitigation, Chongqing University of Science and Technology, Chongqing 401331, China. Electronic address: qihuiwang@cqust.edu.cn.
² School of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.
³ School of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, China; Chongqing Key Laboratory of Energy Engineering Mechanics & Disaster Prevention and Mitigation, Chongqing University of Science and Technology, Chongqing 401331, China. Electronic address: sunyi@cqust.edu.cn.
⁴ Chongqing Industry & Trade Polytechnic, Chongqing 408000, China.
⁵ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.

PMID: 39528181
DOI: 10.1016/j.ijbiomac.2024.137461

Abstract

In recent years, controlled-release green corrosion inhibitors have become a research hotspot in the field of corrosion. In this study, chitosan/plant extract microcapsules (GCI@CS) loaded with Ambrosia artemisiifolia extract (green corrosion inhibitor, GCI) were prepared by emulsification cross-linking. Both the functional groups and micromorphology of GCI@CS were characterized using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and optical microscopy (OM). The loading capacity and encapsulation efficiency of GCI@CS were analyzed using UV-Vis spectroscopy. The corrosion inhibition performance of GCI@CS on carbon steel (C-steel) in 1.0 mol/L HCl was investigated using electrochemical impedance spectroscopy (EIS). The results indicated that GCI@CS, as a pH-sensitive microcapsule, can provide effective corrosion protection for C-steel in HCl solution. Notably, the corrosion resistance of GCI@CS improved with increasing concentration and time. The corrosion inhibition efficiency (η_EIS) of C-steel immersed in 1.0 mol/L HCl (with 500 mg/L GCI@CS) for 24 h reached 93.48 %. This study provides important insights for the industrial deployment of green corrosion inhibitors with controlled release properties.

Keywords: Chitosan microcapsules; Corrosion inhibitor; Plant extract.