Corrosion Inhibition Performance of Imidazoline Derivatives

doi:10.11902/1005.4537.2017.181

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (6): 523-532 DOI: 10.11902/1005.4537.2017.181

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Corrosion Inhibition Performance of Imidazoline Derivatives

Jianguo LIU(

),Ge GAO,Yazhou XU,Zili LI,Wanran JI

1. Qingdao Key Laboratory of Circle Sea Oil & Gas Storage and Transportation Technology, Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety, College of Pipeline and Civil Engineering, China University of Petroleum East China, Qingdao 266580, China

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Abstract

The effect of inhibitor concentration and temperature on the effectiveness of inhibitors of imidazoline derivatives was studied by means of weight loss method, electrochemical measurement, and surface analysis, while the effect of different substituted groups on the inhibition performance of imidazoline inhibitors was also analyzed. The results show that the sixteen alkyl imidazoline has good inhibition effect on the anode and cathode processes, especially for the anode process. The influence of concentration and temperature on the inhibition performance of corrosion inhibitors is interrelated. At lower (25 ℃) or higher (60 ℃) temperatures, only high concentration of corrosion inhibitor can exhibit higher corrosion inhibition rate. At temperatures in the range 40~50 ℃, low concentration of corrosion inhibitor can reach a good corrosion inhibition rate, while the corrosion inhibition rate changes little when the concentration increases. The substituted groups, such as phenylpropionate, can degrade the corrosion inhibition performance of imidazoline inhibitors.

Key words: imidazoline inhibitor mass-loss method electrochemical method

Received: 04 November 2017

ZTFLH:

TG174.42

Fund: Fundamental Research Funds for the Central Universities(16CX02037A);Innovation Program of Qingdao City(15-9-1-70-jch)

Corresponding Authors: Jianguo LIU E-mail: liujianguo@upc.edu.cn

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Cite this article:

Jianguo LIU,Ge GAO,Yazhou XU,Zili LI,Wanran JI. Corrosion Inhibition Performance of Imidazoline Derivatives. Journal of Chinese Society for Corrosion and protection, 2018, 38(6): 523-532.

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https://www.jcscp.org/EN/10.11902/1005.4537.2017.181 OR https://www.jcscp.org/EN/Y2018/V38/I6/523

Fig.1 Corrosion inhibition efficiency of sixteen alkyl imi-dazoline to 20# carbon steel in 3.5%NaCl solution at different temperatures

Fig.2 SEM images of 20 # carbon steel after immersed in 3.5%NaCl solution containing different concentrations of sixteen alkyl imidazoline at different temperatures for 7 d: (a) 30 ℃, 140 mg/L; (b) 30 ℃, 300 mg/L; (c) 30 ℃, 600 mg/L; (d) 50 ℃, 140 mg/L; (e) 50 ℃, 300 mg/L; (f) 50 ℃, 600 mg/L

Table 1 Fitting parameters of 20# carbon steel in 3.5%NaCl solution containing different concentrations of sixteen alkyl imidazoline at 25 ℃

Table 2 Fitting parameters of 20# carbon steel in 3.5%NaCl solution containing different concentrations of imidazoline phenylpropionate at 25 ℃

Fig.3 Polarization curves of 20# carbon steel in 3.5%NaCl solution containing sixteen alkyl imidazoline at 25 ℃

Fig.4 Polarization curves of 20# carbon steel in 3.5%NaCl solution containing imidazoline phenylpropionate at 25 ℃

Fig.5 Nyquist plots of 20# carbon steel during immersion at 25 ℃ in 3.5%NaCl solutions without inhibitor (a) and with different concentrations of sixteen alkyl imidazoline (b) and imidazoline phenylpropionate (c)

Fig.6 Equivalent circuit models for fitting EIS in Fig. 5a and c (a) and Fig.5b (b)

Table 3 Fitting parameters of 20# carbon steel in 3.5%NaCl solutions containing different inhibitors at 25 ℃

Fig.7 Temperature dependences of corrosion inhibition rate of 20# carbon steel in 3.5%NaCl solutions with different concentrations of sixteen alkyl imid-azoline

Fig.8 Polarization curves of 20# carbon steel in 3.5%NaCl solutions with 140 mg/L (a), 200 mg/L (b), 300 mg/L (c) and 600 mg/L (d) sixteen alkyl imidazoline at different temperatures

Table 4 Fitting parameters of polarization curves of 20# carbon steel in 3.5%NaCl solutions containing different concentrations of sixteen alkyl imidazoline at different temperatures

Fig.9 EIS of 20# carbon steel in 3.5%NaCl solutions containing 140 mg/L (a), 200 mg/L (b), 300 mg/L (c) and 600 mg/L (d) sixteen alkyl imidazoline at different temperatures

Fig.10 SEM images of 20# carbon steel after immersion in 3.5%NaCl solutions containing 140 mg/L sixteen alkyl imidazoline for 7 d at 30 ℃ (a), 40 ℃ (b), 50 ℃ (c) and 60 ℃ (d)

Fig.11 SEM images of 20# carbon steel after immersion in 3.5%NaCl solutions containing 300 mg/L sixteen alkyl imidazoline for 7 d at 30 ℃ (a), 40 ℃ (b), 50 ℃ (c) and 60 ℃ (d)

Fig.12 SEM images of 20# carbon steel after immersion in 3.5%NaCl solutions containing 600 mg/L sixteen alkyl imidazoline for 7 d at 30 ℃ (a), 40 ℃ (b), 50 ℃ (c) and 60 ℃ (d)

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