Volume 70, Issue 10 pp. 1907-1916
ARTICLE

Synthesis and evaluation of hexamethylenetetramine quaternary ammonium salt as corrosion inhibitor

Dexin Liu

Corresponding Author

Dexin Liu

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

Correspondence Dexin Liu, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China. Email: [email protected]

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Xiaolong Qiu

Xiaolong Qiu

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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Minglu Shao

Minglu Shao

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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Jianchong Gao

Jianchong Gao

Tianjin Branch, CNOOC China Limited, Tianjin, P. R. China

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Jiaju Xu

Jiaju Xu

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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Qixin Liu

Qixin Liu

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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Hua Zhou

Hua Zhou

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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Zizhao Wang

Zizhao Wang

School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong, P. R. China

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First published: 27 May 2019
Citations: 16

Abstract

A novel corrosion inhibitor, hexamethylenetetramine quaternary ammonium salt, is synthesized using hexamethylenetetramine (HMTA) and bromohexane as main reactants. The inhibitive action of HQAS on QT800-2 steel in hydrochloric acid medium is evaluated by weight-loss method, electrochemical method, and quantum chemical calculation. The obtained results show that the efficiency of 0.5 wt% HQAS inhibitor in 30 wt.% HCl solution at 363 K is 92.95% and HQAS can form an excellent synergistic effect with some additives. Polarization curves reveal that HQAS behaves as a mixed-type inhibitor with dominant anodic inhibition. Furthermore, the theoretical calculation verifies the relationship between the HQAS molecular structure and corrosion inhibition properties.

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