Inhibition for Zn Corrosion by Starch Grafted Copolymer

doi:10.11902/1005.4537.2019.236

Journal of Chinese Society for Corrosion and protection

2021, Vol. 41

Issue (1): 131-138 DOI: 10.11902/1005.4537.2019.236

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Inhibition for Zn Corrosion by Starch Grafted Copolymer

WANG Yating¹, WANG Kexu¹, GAO Pengxiang¹, LIU Ran¹, ZHAO Dishun¹(

), ZHAI Jianhua¹, QU Guanwei²

^1.College of Chemical and Pharmaceutical Engineering, Hebei University of Science and Technology Shijiazhuang 050000, China
^2.Hebei Aohuan Adhesive Products Co. , Ltd. , Baoding 071000, China

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Abstract

Starch grafted copolymer (St-g-PAM) was prepared by grafting acrylamide monomer onto starch with ammonium persulfate sodium bisulfite as initiator, which can be used as a new "green" inhibitor. Then the inhibition effect of St-g-PAM on Zn in 1.0 mol/L HCl solution was studied by mass loss method and electrochemical techniques. The results show that St-g-PAM is a mixed inhibitor with good inhibition effect for Zn corrosion in HCl solution, while the inhibition efficiency increases with the increase of St-g-PAM concentration. However, the inhibition efficiency increases slowly when the St-g-PAM concentration exceeds 50 mg/L. At 20~50 ℃, the adsorption process of St-g-PAM on Zn sheet is consistent with Langmuir adsorption model. According to the results of potentiodynamic polarization and EIS measurements, the inhibition ability of St-g-PAM for Zn corrosion in HCl solution in the presence of St-g-PAM can be expressed in both of the decreased corrosion current density and increased charge transfer resistance values.

Key words: starch graft copolymer zinc corrosion inhibitor corrosion inhibition mechanism

Received: 18 November 2019

ZTFLH:

TG174.42

Fund: National Natural Science and Foundation of China(20576026);Shijiazhuang City Science and;Technology Research and Development Plan(161070251A)

Corresponding Authors: ZHAO Dishun E-mail: zhao_dsh@hebust.edu.cn

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	Yating WANG
	Kexu WANG
	Pengxiang GAO
	Ran LIU
	Dishun ZHAO
	Jianhua ZHAI
	Guanwei QU

Cite this article:

WANG Yating, WANG Kexu, GAO Pengxiang, LIU Ran, ZHAO Dishun, ZHAI Jianhua, QU Guanwei. Inhibition for Zn Corrosion by Starch Grafted Copolymer. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 131-138.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.236 OR https://www.jcscp.org/EN/Y2021/V41/I1/131

Fig.1 IR spectra of St-g-PAM

Table 1 Corrosion rates of zinc in 1.0 mol/L HCl solutions with different concentrations of St-g-PAM at different temperatures (g·m^-2·h^-1)

Fig.2 Variations of inhibition efficiency with mass concen-tration of St-g-PAM

Fig.3 Polarization curves of zinc in 1.0 mol/L HCl solutions with different concentrations of St-g-PAM

Table 2 Polarization curve parameters of zinc in 1.0 mol/L HCl solutions with different concentrations of St-g-PAM

Fig.4 Nyquist plots of zinc in 1.0 mol/L HCl solutions with different concentrations of St-g-PAM

Table 3 Impedance parameters of zinc in 1.0 mol/L HCl solutions with different concentrations of St-g-PAM

Fig.5 Equivalent circuit diagram for fitting electrochemical impedance spectroscopy

Fig.6 Langmuir adsorption isotherms of St-g-PAM on zinc: (a) mass loss data at 20~50 ℃, (b) electroche-mical data at 20 ℃

Table 4 Linear regression parameters of c/θ-ccurves

Fig.7 InK-1/T curve for the adsorption of St-g-PAM on Zn

Table 5 Adsorption thermodynamic parameters of St-g-PAM on zinc

Fig.8 lnν-1/T curves for the adsorption of St-g-PAM on Zn

Table 6 Corrosion kinetic parameters obtained by fitting lnν-1/T straight lines

Fig.9 Relations between ln (ν/T) and 1/T for the adsorp-tion of St-g-PAM on Zn surface

Table 7 Corrosion kinetic parameters obtained by fitting ln (ν/T)-1/T straight lines

Fig.10 SEM (a, c) and AFM (b, d) images of zinc immersed in 1.0 mol/L HCl solutions at 20 ℃ for 2 h without (a, b) and with (c, d) 50 mg/L inhibitor

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