Insights into the newly synthesized N-doped carbon dots for Q235 steel corrosion retardation in acidizing media: A detailed multidimensional study

Mengyue Zhu; Lei Guo; Zhongyi He; Riadh Marzouki; Renhui Zhang; Elyor Berdimurodov

doi:10.1016/j.jcis.2021.10.160

Insights into the newly synthesized N-doped carbon dots for Q235 steel corrosion retardation in acidizing media: A detailed multidimensional study

J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):2039-2049. doi: 10.1016/j.jcis.2021.10.160. Epub 2021 Oct 30.

Authors

Mengyue Zhu¹, Lei Guo², Zhongyi He³, Riadh Marzouki⁴, Renhui Zhang¹, Elyor Berdimurodov⁵

Affiliations

¹ School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China.
² School of Material and Chemical Engineering, Tongren University, Tongren 554300, China; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; Key Laboratory of Material Corrosion and Protection of Sichuan Province, Sichuan University of Science and Engineering, Zigong 643000, China. Electronic address: cqglei@163.com.
³ School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China. Electronic address: zhyhe@ecjtu.edu.cn.
⁴ Chemistry Department, College of Science, King Khalid University, Abha 61413, Saudi Arabia; Chemistry Department, Faculty of Sciences, University of Sfax, 1171 Sfax 3000, Tunisia.
⁵ Faculty of Natural Sciences, Karshi State University, Karshi 180100, Uzbekistan.

PMID: 34749151
DOI: 10.1016/j.jcis.2021.10.160

Abstract

N-doped carbon quantum dots (NCQDs) were synthesized by a hydrothermal method using folic acid and o-phenylenediamine as precursors. The inhibition behaviour of the NCQDs on Q235 steel in 1 M HCl solution was appraised through electrochemical impedance spectroscopy (EIS), potentiodynamic polarization curves (PDP), and surface analysis. The results demonstrated that the synthesized NCQDs had an effective anticorrosion effect on Q235 steel, and the corrosion inhibition efficiency of 150 mg/L NCQDs reached 95.4%. Additionally, the analysis of the PDP corrosion potential changes indicated that the NCQDs acted as a mixed corrosion inhibitor. Moreover, the NCQDs adsorbed onto the surface of steel by coordinating its electron-rich atoms with the iron metal to form a protective film, which slowed the dissolution reaction of the anodic metal to achieve corrosion inhibition. The adsorption mechanism of the NCQDs was consistent with Langmuir adsorption, including physical and chemical adsorption. Therefore, this work can inspire and facilitate, to a certain extent, the future application of doped carbon quantum dots as efficient corrosion inhibitors in pickling solutions.

Keywords: Carbon dots; Corrosion inhibition; Electrochemistry; Mechanism; Q235 steel.

MeSH terms

Adsorption
Carbon
Corrosion
Quantum Dots*
Steel*

Substances

Steel
Carbon