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Open AccessArticle

Experimental and Theoretical Studies on the Corrosion Inhibition of Carbon Steel by Two Indazole Derivatives in HCl Medium

1
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
2
School of Chemistry and Chemical Engineering, Yibin University, Yibin 644000, China
3
School of Material and Chemical Engineering, Tongren University, Tongren 554300, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(8), 1339; https://doi.org/10.3390/ma12081339
Received: 2 April 2019 / Revised: 23 April 2019 / Accepted: 23 April 2019 / Published: 24 April 2019
(This article belongs to the Special Issue Recent Advances in Corrosion Science)
In this work, two indazole derivatives, namely 5-aminoindazole (AIA) and 5-nitroindazole (NIA), were investigated as corrosion inhibitors for carbon steel in 1 M HCl solution by experimental and density functional theory (DFT) methods. The electrochemical results indicate that the inhibition ability follows the order of AIA > NIA, which is due to the stronger electron-donating effect of –NH2 of the AIA group than the –NO2 group of NIA. Besides, the frontier orbital theory shows that the AIA exhibits higher reaction activity than NIA, and a more negative adsorption energy for AIA was also obtained, which is consistent with the analysis of the electrochemical measurements. We draw the conclusion that the electron-donating effect makes it easier for AIA to donate electrons to iron atoms to form a stronger protective layer than NIA. View Full-Text
Keywords: corrosion inhibitor; carbon steel; indazole derivatives; electrochemistry; DFT corrosion inhibitor; carbon steel; indazole derivatives; electrochemistry; DFT
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MDPI and ACS Style

Xu, S.; Zhang, S.; Guo, L.; Feng, L.; Tan, B. Experimental and Theoretical Studies on the Corrosion Inhibition of Carbon Steel by Two Indazole Derivatives in HCl Medium. Materials 2019, 12, 1339.

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