Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N- Hydroxyethyl Imidazoline on Carbon Steel in Simulated Seawater Reverse Osmosis Product Water

doi:10.11902/1005.4537.2014.200

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (5): 407-414 DOI: 10.11902/1005.4537.2014.200

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Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N- Hydroxyethyl Imidazoline on Carbon Steel in Simulated Seawater Reverse Osmosis Product Water

Yuna WANG¹,Kaibin NIE¹,Dong YANG¹,Juanyang YAO²,Wantian DONG³,Qiangqiang LIAO¹(

)

1. Key Lab of Shanghai Colleges and Universities for Corrosion Control in Electric Power and Applied Electrochemistry, Shanghai University of Electric Power, Shanghai 200090, China
2. Shanghai Fenghua Middle School, Shanghai 200072, China
3. Shanghai Fakai Chemical Industry Co. Ltd., Shanghai 201505, China

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Abstract

Corrosion inhibition of 2-undecyl-N-carboxymethyl-N-hydroxyethyl imidazoline (UHCI) on carbon steel in an artificial water, which simulated the water produced by seawater reverse osmosis (RO) process, was investigated by mass loss test, electrochemical methods, and X-ray photoelectron spectroscopy (XPS). Results show that UHCI could inhibit the corrosion of carbon steel, and the inhibition efficiency increases with the increasing concentration of UHCI. The UHCI acts as an anodic type inhibitor responsible for reducing the anodic current density. XPS results suggest that UHCI was adsorbed on the mild steel surface, which can effectively protect carbon steel from corrosion in the artificial water. Quantum chemical calculation results reveal that carboxymethyl and the ring of UHCI play the important role when UHCI adsorbed on carbon steel surface, which leads to the enhancement in the corrosion resistance of carbon steel and thereby a reduction in the corrosion rate.

Key words: 20# carbon steel imidazoline corrosion inhibition seawater desalination reverse osmosis permeate

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	Yuna WANG
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	Dong YANG
	Juanyang YAO
	Wantian DONG
	Qiangqiang LIAO

Cite this article:

Yuna WANG, Kaibin NIE, Dong YANG, Juanyang YAO, Wantian DONG, Qiangqiang LIAO. Corrosion Inhibition of 2-Undecyl-N-Carboxymethyl-N- Hydroxyethyl Imidazoline on Carbon Steel in Simulated Seawater Reverse Osmosis Product Water. Journal of Chinese Society for Corrosion and protection, 2015, 35(5): 407-414.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.200 OR https://www.jcscp.org/EN/Y2015/V35/I5/407

Fig.1 Molecular structure of 2-undecyl-N-carboxymethyl-N-hydroxyethly imidazoline

Fig.2 Optimized molecular structure of UHCI

Table 1 Calculated corrosion rates and inhibition efficiencies in mass loss tests

Fig.3 Polarization curves of carbon steel electrode after immersion for 1 d in simulated seawater RO product water with different concentrations of UHCI

Table 2 Electrochemical parameters of the carbon steel electrode after immersion for 1 d in simulated seawater RO product water with different concentrations of UHCI

Fig.4 Nyquist (a) and Bode plots (b, c) of carbon steel electrode after immersion for 1d in simulated seawater RO product water with different concentrations of UHCI

Fig.5 Equivalent circuit of carbon steel electrode after immersion for 1 d in simulated seawater RO product water with different concentrations of UHCI

Table 3 Fitted results for EIS of carbon steel electrode

Fig.6 XPS full spectrum (a) and peak spectra of C1s (b), O1s (c), N1s (d) and Fe2p3/2 (e) of carbon steel specimen immersed in simulated seawater RO product water with 180 mg/L UHCI for 1d

Table 4 Element content and binding energy of obtained<br/>tained by XPS for carbon steel after immersion for 1 d in simulated seawater RO product water with 180 mg/L UHCI

Fig.7 SEM images of the carbon steel electrodes after immersion for 1 d in simulated seawater RO product water without (a) and with (b) 180 mg/L UHCI

Fig.8 HOMO (a) and LUMO (b) of UHCI molecule

Table 5 Calculated Fukui functions and atomic charges for part atoms of UHCI molecule

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