Synergistic effect of tartaric acid with 2,6-diaminopyridine on the corrosion inhibition of mild steel in 0.5 M HCl

Yujie Qiang; Lei Guo; Shengtao Zhang; Wenpo Li; Shanshan Yu; Jianhong Tan

doi:10.1038/srep33305

Synergistic effect of tartaric acid with 2,6-diaminopyridine on the corrosion inhibition of mild steel in 0.5 M HCl

Sci Rep. 2016 Sep 15:6:33305. doi: 10.1038/srep33305.

Authors

Yujie Qiang^{1

2

3}, Lei Guo⁴, Shengtao Zhang^{1

3}, Wenpo Li^{1

3}, Shanshan Yu¹, Jianhong Tan⁵

Affiliations

¹ School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China.
² School of chemical engineering, Sichuan University of Science and Engineering, Zigong 643000, China.
³ National-municipal Joint Engineering Laboratory for Chemical Process Intensification and Reaction, Chongqing 400044, China.
⁴ School of Materials and Chemical Engineering, Tongren University, Tongren 554300, China.
⁵ School of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China.

Abstract

The inhibitive ability of 2,6-diaminopyridine, tartaric acid and their synergistic effect towards mild steel corrosion in 0.5 M HCl solution was evaluated at various concentrations using potentiodynamic polarization measurements, electrochemical impedance spectroscopy (EIS), and weight loss experiments. Corresponding surfaces of mild steel were examined by atomic force microscope (AFM), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) analysis. The experimental results are in good agreement and reveal a favorable synergistic effect of 2,6-diaminopyridine with tartaric acid, which could protect mild steel from corrosion effectively. Besides, quantum chemical calculations and Monte Carlo simulation were used to clarify the inhibition mechanism of the synergistic effect.

Publication types

Research Support, Non-U.S. Gov't