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

Xianghong Li; Shuduan Deng; Xiaoguang Xie

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

Materials and Product Engineering | Updated：2026-01-06

- Red tetrazolium as an effective inhibitor for the corrosion of cold rolled steel in 7.0 mol·L^-1 H₂SO₄ solution
- Chinese Journal of Chemical Engineering Vol. 26, Issue 12, Pages: 2641-2653(2018)
- Affiliations：
  
  1. 2 Faculty of Materials Science and Engineering, Southwest Forestry University,Kunming,China,650224
  2. 3 School of Chemical Science and Technology, Yunnan University,Kunming,China,650091
- Author bio：
- Funds：
- DOI：
  CLC：
- Published：2018
- Accepted：
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摘要

Abstract

The corrosion inhibition of cold rolled steel (CRS) in 7.0 mol·L

-1

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

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

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 R

(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.

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