Investigation of Corrosion Inhitibion Behavior of 2-aminobenzothiazole and Benzotriazole on Copper Surface

doi:10.11902/1005.4537.2019.195

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 577-584 DOI: 10.11902/1005.4537.2019.195

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Investigation of Corrosion Inhitibion Behavior of 2-aminobenzothiazole and Benzotriazole on Copper Surface

LU Shuang, REN Zhengbo, XIE Jinyin, LIU Lin(

)

Liaoning Province Key Laboratory for Synthesis and Application of Functional Compounds, College of Chemistry and Chemical Engineering, Bohai University, Jinzhou 121013, China

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Abstract

Corrosion inhibition films of 2-aminobenzothiazole (ABT), benzotriazole (BTA) and mixtures of ABT to BTA on Cu surface were fabricated through molecular self-assembled process and then characterized by means of field emission scanning electron microscopy (SEM), atomic force microscopy (AFM), Raman spectroscopy (RAM) and optical Contact Angle (CA) measurement, while their corrosion inhibition behavior at 25 ℃ in 3.5% (mass fraction) NaCl solution was assessed. Two factors, namely the molar ratio of ABT to BTA of their mixtures and the dose of the mixture on the corrosion inhibition behavior were studied, respectively. When the dose of the inhibitors mixture was 20 mmol/L with the molar ratio was 1:1, its corrosion inhibition efficiency could reach up to 96.34%. The inhibition mechanism of ABT and BTA were acquired through kinetic analysis. Results confirmed that there exist physical absorption and chemisorption for all of them. The corrosion inhibition performance of complex films of the two inhibitors was better than that of every single inhibitor. The relevant collaborative parameters were calculated for predicting the performance of synergistic effect.

Key words: Cu 2-aminobenzothiazole benzotriazole self-assembly membrane synergistic effect corrosion inhibition

Received: 01 November 2019

ZTFLH:

TG174.42

Fund: Liaoning Innovation Team Project(2018-479-14);Liaoning Innovation Team Project(LT2015001)

Corresponding Authors: LIU Lin E-mail: liulin@bhu.edu.cn

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LU Shuang, REN Zhengbo, XIE Jinyin, LIU Lin. Investigation of Corrosion Inhitibion Behavior of 2-aminobenzothiazole and Benzotriazole on Copper Surface. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 577-584.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.195 OR https://www.jcscp.org/EN/Y2020/V40/I6/577

Fig.1 Molecule structures of ABT (a) and BTA (b)

Fig.2 Potentiodynamic polarization curves of Cu with surface self-assembly of different concentrations of ABT (a) and BTA (b) in 3.5%NaCl solution

Table 1 Electrochemical parameters of Cu with surface self-assembly of different concentrations of ABT and BTA in 3.5%NaCl solution

Fig.3 Potentiodynamic polarization curves of Cu with surface self-assembly of ABT and BTA (their total concentration is 20 mmol/L, but the concentration of ABT varies) in 3.5%NaCl solution

Table 2 Electrochemical parameters obtained by fitting polarization curves of Cu in Fig.3

Fig.4 Potentiodynamic polarization curves of Cu with surface self-assembly of ABT and BTA (the concentration of ABT is 50%, but the total concentration of ABT and BTA varies) in 3.5% NaCl solution

Table 3 Electrochemical parameters obtained by fitting polarization curves of Cu in Fig.4

Fig.5 Nyquist plots of Cu with surface self-assembly of ABT and BTA (the total concentration of ABT and BTA is 20 mmol/L, but the concentration of ABT varies) in 3.5%NaCl solution

Table 4 Component parameters obtained by fitting Nyquist plots in Fig.5

Fig.6 Nyquist plots of Cu with surface self-assembly of ABT and BTA (the concentration of ABT is 50%, but the total concentration of ABT and BTA varies) in 3.5%NaCl solution

Table 5 Component parameters obtained by fitting Nyquist plots in Fig.6

Fig.7 Equivalent circuits of Cu with surface self-assembly of different inhibitors in 3.5%NaCl solution: (a) the concentrations of ABT is 30%, 70%, 90%; (b) the concentrations of ABT is 0%, 10%, 50%, 100%

Fig.8 Langmuir adsorption plots of (a) ABT and (b) BTA on copper surface

Fig.9 Surface micrographs of Cu samples with surface self-assemblies of ABT (a), BTA (b) and ABT-BTA (c) after corrosion in 3.5%NaCl solution and the magnified images of square areas in Fig.9a (d), Fig.9b (e) and Fig.9c (f)

Fig.10 Optical contact angle values of Cu samples without (a) and with surface self-assemblies of ABT (b), BTA (c) and ABT-BTA (d)

Fig.11 Raman spectra of Cu samples with surface self-assemblies of ABT, BTA and ABT-BTA

Fig.12 AFM images of Cu samples with surface self-assemblies of ABT (a), BTA (b) and ABT-BTA (c)

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