淀粉接枝共聚物对Zn的缓蚀性能

doi:10.11902/1005.4537.2019.236

中国腐蚀与防护学报

2021, Vol. 41

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

研究报告

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淀粉接枝共聚物对Zn的缓蚀性能

王亚婷¹, 王棵旭¹, 高鹏翔¹, 刘冉¹, 赵地顺¹(

), 翟建华¹, 屈冠伟²

^1.河北科技大学化学与制药工程学院石家庄 050000
^2.河北奥环胶粘制品有限公司保定 071000

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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摘要:

以过硫酸铵-亚硫酸氢钠为引发剂，将丙烯酰胺单体接枝到淀粉上制备了淀粉接枝共聚物 (St-g-PAM)，可作为一种新型“绿色”缓蚀剂。通过失重实验和电化学测试研究了St-g-PAM对1.0 mol/L HCl溶液中Zn的缓蚀效果。结果表明，St-g-PAM在HCl溶液中对Zn具有较好的缓蚀性，是一种混合抑制型缓蚀剂。缓蚀率随St-g-PAM质量浓度的增加而增大；但当浓度超过50 mg/L时，缓蚀率增加变缓慢。在20~50 ℃下，St-g-PAM在Zn表面的吸附过程与Langmuir吸附模型一致。动电位极化曲线和电化学阻抗测试结果表明，St-g-PAM在HCl溶液中对Zn有较好的缓蚀作用，表现为St-g-PAM存在条件下，Zn腐蚀电流密度减小，电荷转移电阻增大。

关键词 ：淀粉接枝共聚物, Zn, 缓蚀剂, 缓蚀机理

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

收稿日期: 2019-11-18

ZTFLH:

TG174.42

基金资助:国家自然科学基金(20576026);石家庄市科学技术研;究与发展计划(161070251A)

通讯作者: 赵地顺 E-mail: zhao_dsh@hebust.edu.cn

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

作者简介: 王亚婷，女，1995年生，硕士生

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引用本文:

王亚婷, 王棵旭, 高鹏翔, 刘冉, 赵地顺, 翟建华, 屈冠伟. 淀粉接枝共聚物对Zn的缓蚀性能[J]. 中国腐蚀与防护学报, 2021, 41(1): 131-138.
Yating WANG, Kexu WANG, Pengxiang GAO, Ran LIU, Dishun ZHAO, Jianhua ZHAI, Guanwei QU. Inhibition for Zn Corrosion by Starch Grafted Copolymer. Journal of Chinese Society for Corrosion and protection, 2021, 41(1): 131-138.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.236 或 https://www.jcscp.org/CN/Y2021/V41/I1/131

图1 St-g-PAM的红外谱图

表1 不同温度下锌片在不同质量浓度St-g-PAM的1.0 mol/L HCl溶液中的腐蚀速率

图2 不同温度下缓蚀率与缓蚀剂St-g-PAM质量浓度的关系曲线

图3 Zn在含不同质量浓度St-g-PAM的1.0 mol/L HCl溶液中的极化曲线

表2 Zn在不同质量浓度St-g-PAM条件下的极化曲线参数

图4 Zn在含不同质量浓度St-g-PAM的1.0 mol/L HCl溶液中的Nyquist图

表3 Zn在不同质量浓度St-g-PAM下的阻抗参数

图5 拟合电化学阻抗谱的等效电路图

图6 St-g-PAM在Zn表面的Langmuir吸附等温线

表4 c/θ-c直线回归参数表

图7 St-g-PAM在Zn表面吸附的lnK-1/T的关系曲线

表5 St-g-PAM在Zn表面的吸附热力学参数

图8 St-g-PAM在Zn表面吸附的lnν与1/T的关系曲线

表6 由lnν-1/T关系曲线拟合得到的腐蚀动力学参数

图9 St-g-PAM在Zn表面吸附的 ln (ν/T) 与1/T的关系曲线

表7 由ln (ν/T)-1/T直线拟合得到的腐蚀动力学参数

图10 Zn在20 ℃下1.0 mol/L HCl溶液中浸泡2 h的SEM和AFM像

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