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Synthesis and anti-corrosion performance of C21H25NO on corrosion of N80 steel in hydrochloric acid solution

Yanhua Zhu (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu, China)
Liqiang Zhao (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu, China)
Pingli Liu (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu, China)
Xiao Qu (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Engineering, Southwest Petroleum University, Chengdu, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 9 August 2019

Issue publication date: 22 August 2019

Abstract

Purpose

In this work, a kind of Mannich base (C21H25NO) was synthesized with cinnamal aldehyde, acetophenone and diethylamine in a condensing reflux device based on the conventional method. Optimization of the inhibitor concentration was explored.

Design/methodology/approach

Spectral properties of this compound was investigated by FTIR, and its inhibition efficiency and mechanism on N80 steel in 20% hydrochloric acid solution were studied by weight loss measurement, electrochemical measurement (potentiodynamic polarization and electrochemical impedance spectroscopy) and surface analytical measurement (scanning electron microscope with energy dispersive spectrometer).

Findings

The results showed that the new inhibitor reduced the double-layer capacitance and increased the charge transfer resistance. The inhibition efficiency is 99.7% when the concentration of C21H25NO is 3%. The adsorption of C21H25NO on N80 steel surface in 20% HCl solution was found to be spontaneous and steady. Observed from the steel surface, an inhibition film was confirmed to be presented after adding inhibitor and successfully hindered the corrosive ions from reaching the bulk steel.

Originality/value

A new Mannich base (C21H25NO) was synthesized by cinnamal aldehyde, acetophenone and diethylamine for the corrosion prevention of N80 steel in 20% hydrochloric acid solution.

Keywords

Citation

Zhu, Y., Zhao, L., Liu, P. and Qu, X. (2019), "Synthesis and anti-corrosion performance of C21H25NO on corrosion of N80 steel in hydrochloric acid solution", Anti-Corrosion Methods and Materials, Vol. 66 No. 5, pp. 573-582. https://doi.org/10.1108/ACMM-05-2019-2119

Publisher

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Emerald Publishing Limited

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