Insight into the anti-corrosion performance of three imidazo-pyridazines for Al alloy in different concentrations of hydrochloric acid solutions

[Display omitted] Imidazo-pyridazine and Bromo/Chloro-Imidazo-pyridazines are employed as the inhibitors for Al alloy in 0.1 M HCl and 0.5 M HCl solutions. The electrochemical tests and adsorption model analysis revealed that three compounds are mixed-type inhibitors and Imidazo-pyridazine exhibited...

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Bibliographic Details
Published in:Journal of industrial and engineering chemistry (Seoul, Korea) Korea), 2022-09, Vol.113, p.348-359
Main Authors: Ren, Xiaolei, Bai, Jinwu, Gu, Xingxing, Xu, Hui, Tan, Bochuan, Xu, Shenying, Hao, Jiangyu, Gao, Fang, Li, Xin
Format: Article
Language:English
Subjects:
Adsorption
Al alloys
Electrochemistry
Inhibitor
Interface
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Summary:[Display omitted] Imidazo-pyridazine and Bromo/Chloro-Imidazo-pyridazines are employed as the inhibitors for Al alloy in 0.1 M HCl and 0.5 M HCl solutions. The electrochemical tests and adsorption model analysis revealed that three compounds are mixed-type inhibitors and Imidazo-pyridazine exhibited the best anti-corrosion performance for Al electrode in HCl solutions by physisorption. From electrochemical results, the best anti-corrosion efficiency is 88.1% for Al in 0.5 M HCl with 2.0 mM IP, while the efficiency is 75.5% for Al in 0.5 M HCl with 1.0 mM IP. The different inhibition behaviors result from the probability of the formation of AlCl-ads and N-onium ions. The formation of adsorption is due to the electrostatic attraction between AlCl-ads and N-onium ions. The surface topography test revealed that the Imidazo-pyridazine is the best corrosion barrier for Al in 0.5 M HCl. The dynamic simulation demonstrated that the inhibition molecules and protonated molecules can adsorb on the Al surface spontaneously with parallel adsorption configuration no matter in more or less Cl- atmosphere.
ISSN:1226-086X
DOI:10.1016/j.jiec.2022.06.008