Inhibition Action of Cassava Starch Ternary Graft Copolymer on Steel in H2SO4 Solution

doi:10.11902/1005.4537.2019.035

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 105-114 DOI: 10.11902/1005.4537.2019.035

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Inhibition Action of Cassava Starch Ternary Graft Copolymer on Steel in H₂SO₄ Solution

LI Xianghong¹(

), DENG Shuduan², XU Xin¹

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

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Abstract

Cassava starch ternary graft copolymer (CS-SAS-AAGC) was prepared by grafting two monomers of sodium allylsulfonate (SAS) and acryl amide (AA) simultaneously on the plain cassava starch (CS). The inhibition effect of CS-SAS-AAGC on the corrosion of cold rolled steel (CRS) in H₂SO₄ was studied by mass loss method, electrochemical technique, scanning electron microscope (SEM) and contact angle measurement. The results show that inhibition performance of CS-SAS-AAGC is better than the single CS, AA or SAS, and the maximum inhibition efficiency is higher than 90%. The adsorption of CS-SAS-AAGC on CRS surface obeys Langmuir isotherm. Inhibitive action gradually decreases with the increase of temperature and acid concentration, while almost remains stable along with the increase of immersion time. CS-SAS-AAGC acts as a mixed-type inhibitor while mainly retards the cathodic reaction. With the addition of CS-SAS-AAGC, the charge transfer resistance of CRS electrode surface is drastically increased, the CRS surface becomes hydrophobic, as a result, its corrosion is efficiently mitigated.

Key words: cassava starch ternary graft copolymer inhibition cold rolled steel sulfuric acid adsorption

Received: 14 March 2019

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51561027);Training Programs of Young and Middle Aged Academic and Technological Leaders in Yunnan Province(2015HB049);Training Programs of Young and Middle Aged Academic and Technological Leaders in Yunnan Province(2017HB030)

Corresponding Authors: LI Xianghong E-mail: xianghong-li@163.com

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LI Xianghong, DENG Shuduan, XU Xin. Inhibition Action of Cassava Starch Ternary Graft Copolymer on Steel in H₂SO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 105-114.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.035 OR https://www.jcscp.org/EN/Y2020/V40/I2/105

Fig.1 FTIR of CS and CS-SAS-AAGC

Fig.2 Relations between inhibition efficiency of CS-SAS-AAGC and inhibitor mass fraction in 1.0 mol/L H₂SO₄ solution at 20 ℃

Fig.3 Straight lines of c/θ-c in 1.0 mol/L H₂SO₄ at solution 20 ℃

Table 1 Linear regression parameters of c/θ-c and standard adsorption Gibbs free energy ΔG⁰

Fig.4 Relations between inhibition efficiency and tempera-ture in1.0 mol/L H₂SO₄ solution

Fig.5 Fitted lines of ln v-1/T in1.0 mol/L H₂SO₄ solution

Table 2 Corrosion kinetic parameters of the straight lines oflnv-1/T

Fig.6 Fitted lines of ln(v/T)-1/T in1.0 mol/L H₂SO₄ solution

Table 3 Corrosion kinetic parameters of the straight lines ofln(v/T)-1/T

Fig.7 Relations between inhibition efficiency and concen-tration of H₂SO₄ solution

Fig.8 Fitted lines of lnv-C in H₂SO₄ solutions at 20 ℃

Table 4 Corrosion kinetic parameters of the straight lines of lnv-C

Fig.9 Changed curves of η_w-t in 1.0 mol/L H₂SO₄ soluti-ons at 20 ℃

Fig.10 Polarization curves for CRS in 1.0 mol/L H₂SO₄ solution containing CS-SAS-AAGC at 20 ℃

Table 5 Potentiodynamic polarization parameters for CRS in 1.0 mol/L H₂SO₄ solution at 20 ℃

Fig.11 Nyquist plots for steel in 1.0 mol/L H₂SO₄ soluti-on containing CS-SAS-AAGC at 20 ℃

Fig.12 Equivalent circuit used to fit the EIS

Table 6 Electrochemical impedance spectroscopy parameters for CRS in 1.0 mol/L H₂SO₄ at 20 ℃

Fig.13 SEM micrographs of cold rolled steel surfaces: (a) before immersion, (b) corrosion immersion in 1.0 mol/L H₂SO₄ at 20 ℃ for 6 h, (c) corrosion immersion in 1.0 mol/L H₂SO₄ containing 50 mg/L CS-SAS-AAGC at 20 ℃ for 6 h

Fig.14 Contact angle images of cold rolled steel surfaces: (a) before immersion, (b) corrosion immersion in 1.0 mol/L H₂SO₄ at 20 ℃ for 6 h, (c) corrosion immersion in 1.0 mol/L H₂SO₄ containing 50 mg/L CS-SAS-AAGC at 20 ℃ for 6 h

Fig.15 Molecular structures of CS (a) and CS-SAS-AAGC (b)

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