Inhibition Performance of Coconut Diethanolamide on Cold Rolled Steel in Trichloroacetic Acid Solution

doi:10.11902/1005.4537.2022.077

Journal of Chinese Society for Corrosion and protection

2023, Vol. 43

Issue (2): 301-311 DOI: 10.11902/1005.4537.2022.077

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Inhibition Performance of Coconut Diethanolamide on Cold Rolled Steel in Trichloroacetic Acid Solution

QIU Li¹, LI Xianghong², LEI Ran², DENG Shuduan¹(

)

^1.Faculty of Materials Science and Engineering, Southwest Forestry University, Kunming 650224, China
^2.College of Chemical Engineering, Southwest Forestry University, Kunming 650224, China

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Abstract

The corrosion inhibition effect of nonionic surfactant coconut oleic acid diethanolamide (CDEA) on a cold rolled steel in 0.10 mol/L trichloroacetic acid (Cl₃CCOOH) solution was studied by mass loss method, electrochemical test, surface morphology characterization (SEM and AFM) and contact angle tester，while the relation of the inhibition performance of CDEA with the surface tension and electrical conductivity of its solution was also studied.The results show that CDEA has obvious corrosion inhibition effect on CRS in Cl₃CCOOH solution. The corrosion inhibition efficiency can reach as high as 95% for the CRS corrosion at 20 and 30 ℃ with the CDEA dose of only 20 mg/L. The corrosion inhibition performance increase with the increasing CDEA concentration, but decreases with the rising temperature. The adsorption of CDEA on the CRS surface is in accordance with the Langmuir adsorption, a spontaneous and exothermic process, and the standard free energy of Gibbs adsorption is -33.6--33.0 kJ/mol at 20-50 ℃. CDEA is a mixed corrosion inhibitor that inhibits both the cathodic hydrogen evolution and anodic dissolution, and the corrosion inhibition mechanism is "geometric coverage effect". With the addition of CDEA, the capacitive arc of Nyquist diagram is enlarged, and the charge transference increased. SEM and AFM micrographs further confirm that CDEA significantly inhibited the corrosion of CRS surface in Cl₃CCOOH solution. Being treated by CDEA inhibitor, the surface of CRS shows strong hydrophobicity with a water contact angle of 100.66°. The surface tension of the solution decreased with the addition of CDEA, however after immersion test of the steel, the surface tension of the solution with CDEA turned to be higher, in the contrast to the original ones. the electrical conductivity of the solution increases with the concentration of CDEA and reached a peak near 50mg/L.

Key words: inhibition coconut oleic acid diethanolamide steel trichloroacetic acid adsorption

Received: 17 March 2022 32134.14.1005.4537.2022.077

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52161016);National Natural Science Foundation of China(51761036);Fundamental Research Project for Distinguished Young Scholars in Yunnan Province(202001AV070008);Special Project of "Top Young Talents" of Yunnan Ten Thousand Talents Plan(51900109);Special Project of "Industry Leading Talents" of Yunnan Ten Thousand Talents Plan(80201408)

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	QIU Li
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	DENG Shuduan

Cite this article:

QIU Li, LI Xianghong, LEI Ran, DENG Shuduan. Inhibition Performance of Coconut Diethanolamide on Cold Rolled Steel in Trichloroacetic Acid Solution. Journal of Chinese Society for Corrosion and protection, 2023, 43(2): 301-311.

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https://www.jcscp.org/EN/10.11902/1005.4537.2022.077 OR https://www.jcscp.org/EN/Y2023/V43/I2/301

Fig.1 Chemical molecular structure of the nonionic surfactant of coconut diethanolamide (CDEA, C₁₁H₂₃CON(CH₂CH₂OH)₂)

Fig.2 Relationship between corrosion rate (v) (a) and inhibition efficiency (η_w) (b) with changing CDEA concen-tration (c) in 0.10 mol/L Cl₃CCOOH solution at 20-50 ℃

Fig.3 Relationship of c/θ-c in 0.10 mol/L Cl₃CCOOH solu-tion at different temperatures

Table 1 Linear regression parameters between c/θ and c

Fig.4 Relationship between lnK-1/T in 0.10 mol/L Cl₃CCOOH solution at different temperatures

Table 2 Adsorption thermodynamic parameters of CDEA on steel surfacein 0.10 mol/L Cl₃CCOOH solution

Fig.5 Relationship between lnK-1/T (a) relationship between E_a and ln A with c (b) in 0.10 mol/L Cl₃CCOOH solution at different temperatures

Fig.6 Potentiodynamic polarization curves of CRS in 0.10 mol/L Cl₃CCOOH solutions without and with CDEA at 20 ℃

Table 3 Potentiodynamic polarization parameters for coldrolled steel in 0.10 mol/L Cl₃CCOOH solutions without and with CDEA at 20 ℃

Fig.7 Nyquist plots (a) and Bode modulus and Bode phases (b) of the corrosion of CRS in 0.10 mol/L Cl₃CCOOH solutions without and with CDEA at 20 ℃

Fig.8 Equivalent circuit diagram without R_s (CPER_t(LR_L)) (a) and with EDEA R_s(CPER_t) (b)

Table 4 EIS parameters for the corrosion of cold rolled steel in 0.10 mol/L Cl₃CCOOH solutions without and with different concentrations CDEA at 20 ℃

Fig.9 SEM microscopic images of steel sheet surfaces: (a) before corrosion; (b) after corrosion in 0.10 mol/L Cl₃CCOOH solution for 6 h; (c) after corrosion in 100 mg/LCDEA+0.10 mol/L Cl₃CCOOH solution for 6 h

Fig.10 3D-AFM (a, d, g), tapping amplitude and tapping phase images (b, c, e, f, h, i) of CRS surfaces: (a-c) before corrosion; (d-f) after corrosion at 20 ℃ in 0.10 mol/L Cl₃CCOOH solution for 6 h; (g-i) after corrosion at 20 ℃ in 0.10 mol/L Cl₃CCOOH solution containing 100 mg/L CDEA for 6 h

Table 5 Surface roughness parameters of 3D-AFM of CRS

Fig.11 Contact angel measurements on steel surfaces with different conditions: (a) before corrosion; (b) after 6 h corrosion in 0.10 mol/L Cl₃CCOOH at 20 ℃; (c) after 6 h corrosion in 0.10 mol/L Cl₃CCOOH solutions containing 100 mg/L CDEA at 20 ℃

Fig.12 Relationship between surface tension (σ) and CDEA concentration (c)

Fig.13 Relationship between the electrical conductivity (к) of solution and CDEA (c)

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