Corrosion inhibition performance of composite based on chitosan derivative
By Zheng, Yuxuan; Gao, Yuhua; Li, Haihua; Yan, Meifang; Guo, Ruhui; Liu, Zhenfa
Published in Journal of Molecular Liquids
Journal of Molecular Liquids
2020
Abstract
The shortage of water resources has resulted in municipal wastewater (MWW) becoming the main source of industrial cooling water replenishment. However, MWW causes severe erosion in carbon steel water pipelines, and the most widely used phosphorus-containing corrosion inhibitor currently available, 2-hydroxyphosphonocarboxylic acid (HPAA), only shows effective inhibitory effects at high doses. In this work, a natural polymer, N-carboxylated chitosan (NCC), was developed via a pollution-free method, and the resulting compound was formulated as a water treatment corrosion inhibitor. This compound was composited with NCC, HPAA, gluconic acid sodium (GA), and ZnSO4, and the resulting compound was abbreviated as NHGZ. This process greatly reduced the use of phosphorus-containing compounds. The performances of NCC and NHGZ were then evaluated by electrochemical and weight-loss studies. Electrochemical test results demonstrated that NCC is a cathodic corrosion inhibitor, whereas NHGZ is a mixed corrosion inhibitor. The weight-loss studies showed that the corrosion rate of NHGZ in MWW at 40