SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (12): 2641-2653.DOI: 10.1016/j.cjche.2018.02.029

• Materials and Product Engineering • Previous Articles     Next Articles

Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·L-1 H2SO4 solution

Xianghong Li1, Shuduan Deng2, Xiaoguang Xie3   

  1. 1 Faculty of Chemical Engineering, Southwest Forestry University, Kunming 650224, China;
    2 Faculty of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China;
    3 School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
  • Received:2017-12-14 Revised:2018-02-21 Online:2019-01-09 Published:2018-12-28
  • Contact: Xianghong Li
  • Supported by:

    Supported by the National Natural Science Foundation of China (51361027) and the Training Program of Young and Middle Aged Academic and Technological Leaders in Yunnan Province (2015HB049).

Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·L-1 H2SO4 solution

Xianghong Li1, Shuduan Deng2, Xiaoguang Xie3   

  1. 1 Faculty of Chemical Engineering, Southwest Forestry University, Kunming 650224, China;
    2 Faculty of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China;
    3 School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
  • 通讯作者: Xianghong Li
  • 基金资助:

    Supported by the National Natural Science Foundation of China (51361027) and the Training Program of Young and Middle Aged Academic and Technological Leaders in Yunnan Province (2015HB049).

Abstract: The corrosion inhibition of cold rolled steel (CRS) in 7.0 mol·L-1 H2SO4 solution by red tetrazolium (RTZ) was carefully investigated using both experimental procedures and theoretical techniques. The results show that RTZ acts as an effective inhibitor for the corrosion of CRS in 7.0 mol·L-1 H2SO4, and the maximum inhibition efficiency is higher than 95% with a RTZ concentration of 2.0 mmol·L-1. The adsorption of RTZ on CRS surface follows Langmuir isotherm. RTZ effectively retards both cathodic and anodic reactions, and acts as a mixed-type inhibitor. EIS exhibits two capacitive loops, and their resistances increase drastically in the presence of RTZ. SEM and AFM confirm that the addition of RTZ could significantly retard the corrosion of CRS surface. A series of characterizations like FTIR, RS, XRD and XPS reveal that the corrosion CRS surface is composed of the corrosion products of iron sulfates, iron oxides and iron hydroxide, as well as inhibitor. Theoretical results of quantum chemical calculation and molecular dynamics (MD) indicate that the adsorption center of RTZ+ (organic cationic part of RTZ) mainly relies on its tetrazole ring, and the adsorption of RTZ+ on Fe (001) surface is in a nearly flat orientation mode.

Key words: Steel, Sulfuric acid, Red tetrazolium, Corrosion inhibitor, Adsorption

摘要: The corrosion inhibition of cold rolled steel (CRS) in 7.0 mol·L-1 H2SO4 solution by red tetrazolium (RTZ) was carefully investigated using both experimental procedures and theoretical techniques. The results show that RTZ acts as an effective inhibitor for the corrosion of CRS in 7.0 mol·L-1 H2SO4, and the maximum inhibition efficiency is higher than 95% with a RTZ concentration of 2.0 mmol·L-1. The adsorption of RTZ on CRS surface follows Langmuir isotherm. RTZ effectively retards both cathodic and anodic reactions, and acts as a mixed-type inhibitor. EIS exhibits two capacitive loops, and their resistances increase drastically in the presence of RTZ. SEM and AFM confirm that the addition of RTZ could significantly retard the corrosion of CRS surface. A series of characterizations like FTIR, RS, XRD and XPS reveal that the corrosion CRS surface is composed of the corrosion products of iron sulfates, iron oxides and iron hydroxide, as well as inhibitor. Theoretical results of quantum chemical calculation and molecular dynamics (MD) indicate that the adsorption center of RTZ+ (organic cationic part of RTZ) mainly relies on its tetrazole ring, and the adsorption of RTZ+ on Fe (001) surface is in a nearly flat orientation mode.

关键词: Steel, Sulfuric acid, Red tetrazolium, Corrosion inhibitor, Adsorption