Performance Evaluation and Adsorption Behavior of Two New Mannich Base Corrosion Inhibitors

doi:10.11902/1005.4537.2019.220

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (1): 31-37 DOI: 10.11902/1005.4537.2019.220

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Performance Evaluation and Adsorption Behavior of Two New Mannich Base Corrosion Inhibitors

LV Xianghong¹,ZHANG Ye¹(

),YAN Yali¹,HOU Juan²,LI Jian¹,WANG Chen¹

1. School of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China
2. School of New Energy and Materials, China University of Petroleum, Beijing 102249, China

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Abstract

Two Mannich base corrosion inhibitors, ZJ-1 and ZJ-2, were synthesized by Mannich reaction. The products were characterized by infrared spectroscopy. Corrosion inhibition effect of these two inhibitors on P110 steel were studied by means of polarization curve measurement, electrochemical impedance spectroscopy and molecular dynamics simulation. While the relevant corrosion inhibition mechanism and adsorption behavior were also discussed. Results showed that the two synthesized corrosion inhibitors presented obvious corrosion inhibition effect on P110 steel in 1 mol/L NaCl+CO₂ environment, however, ZJ-1 had better corrosion inhibition effect with a corrosion inhibition efficiency up to 92.06%. These two corrosion inhibitors were belonged to mixed corrosion inhibitors based on anode control. Both the anode reaction and the cathode reaction were restrained in the corrosion process due to the adsorption film formed on the metal surface by corrosion inhibitors. Furthermore, ZJ-1 and ZJ-2 can displace water molecules and adsorb on the metal surface, the lone pair electrons provided by the active atoms N and O could form coordination bonds with the vacant orbital of Fe. Therefore, corrosion inhibitor molecules can be adsorbed on the metal surface and the corrosion inhibition effect is enhanced due to strong chemical forces of the bonds. Compared with ZJ-2 inhibitor, ZJ-1 inhibitor molecule has higher adsorption energy and better corrosion inhibition performance to the surface of Fe-based alloys.

Key words: corrosion inhibitor Mannich base corrosion inhibition mechanism adsorption behavior molecular dynamics simulation

Received: 21 May 2019

ZTFLH:

TG174.42

Fund: Natural Science Foundation of Shaanxi Province(2018JQ5108);Natural Science Foundation of Shaanxi Province(2018JQ5198);Innovation and Practice Ability Training Program of Xi'an Shiyou University(YCS19113059)

Corresponding Authors: Ye ZHANG E-mail: ZhangY931126@163.com

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	Xianghong LV
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Cite this article:

LV Xianghong,ZHANG Ye,YAN Yali,HOU Juan,LI Jian,WANG Chen. Performance Evaluation and Adsorption Behavior of Two New Mannich Base Corrosion Inhibitors. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 31-37.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.220 OR https://www.jcscp.org/EN/Y2020/V40/I1/31

Fig.1 Synthesis of ZJ-1 (a) and ZJ-2 (b) mannich base corrosion inhibitor

Fig.2 Infrared spectra of ZJ-1 (a) and ZJ-2 (b) Mannich base corrosion inhibitor

Fig.3 Polarization curves of P110 steel in different corros-ion inhibitor solutions

Table 1 Fitting electrochemical parameters of P110 steel in different corrosion inhibitor solutions

Fig.4 Electrochemical impedance spectra of P110 steel in different corrosion inhibitor solutions (a) and its equivalent circuit of blank (b) and corrosion inhib-itor (c)

Table 2 Impedance parameters of P110 steel in different corrosion inhibitor solutions

Fig.5 Initial configurations (a, c) and equilibrium adsorption configurations (b, d) of ZJ-1 (a, b) and ZJ-2 (c, d) molecules

Fig.6 Temperature equilibrium curves (a, c) and energy fluctuation curves (b, d) of adsorption of ZJ-1 (a, b) and ZJ-2 (c, d) molecules on Fe(001) surface

Table 3 Adsorption energy of corrosion inhibitor molecule and Fe(001) surface

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