木薯淀粉三元接枝共聚物对钢在H<sub>2</sub>SO<sub>4</sub>溶液中的缓蚀性能研究

doi:10.11902/1005.4537.2019.035

中国腐蚀与防护学报

2020, Vol. 40

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

研究报告

本期目录 | 过刊浏览

木薯淀粉三元接枝共聚物对钢在H₂SO₄溶液中的缓蚀性能研究

李向红¹(

), 邓书端², 徐昕¹

1 西南林业大学化学工程学院昆明 650224
2 西南林业大学材料科学与工程学院昆明 650224

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

全文: PDF(3700 KB) HTML

摘要:

将两种烯类单体烯丙基磺酸钠 (SAS) 和丙烯酰胺 (AA) 同时接枝共聚在木薯淀粉 (CS) 上制备出木薯淀粉三元接枝共聚物CS-SAS-AAGC；用失重法、电化学法、扫描电镜 (SEM) 和接触角测试研究了CS-SAS-AAGC对冷轧钢在H₂SO₄溶液中的缓蚀性能。结果表明，CS-SAS-AAGC的缓蚀性能远远优于CS，SAS和AA，最大缓蚀率可超过90%，且在钢表面的吸附符合Langmuir吸附等温式。缓蚀性能随温度和酸浓度的增加而逐渐下降，但随腐蚀浸泡时间的延长而基本保持不变。CS-SAS-AAGC为抑制阴极为主的混合抑制型缓蚀剂；添加CS-SAS-AAGC后钢电极表面的电荷转移电阻显著增大，腐蚀微观形貌显著降低，且具有较强的疏水性。

关键词 ：三元接枝共聚物, 缓蚀, 冷轧钢, 硫酸, 吸附

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

收稿日期: 2019-03-14

ZTFLH:

TG174

基金资助:国家自然科学基金(51561027);云南省中青年学术和技术带头人人才培养项目(2015HB049);云南省中青年学术和技术带头人人才培养项目(2017HB030)

通讯作者: 李向红 E-mail: xianghong-li@163.com

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

作者简介: 李向红，男，1981年生，博士，教授

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引用本文:

李向红, 邓书端, 徐昕. 木薯淀粉三元接枝共聚物对钢在H₂SO₄溶液中的缓蚀性能研究[J]. 中国腐蚀与防护学报, 2020, 40(2): 105-114.
Xianghong LI, Shuduan DENG, Xin XU. 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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.035 或 https://www.jcscp.org/CN/Y2020/V40/I2/105

图1 CS和CS-SAS-AAGC的FTIR谱图

图2 20 ℃时1.0 mol/L H2SO4溶液中CS-SAS-AAGC的缓蚀率与缓蚀剂浓度的关系

图3 20 ℃时1.0 mol/L H2SO4溶液中的c/θ-c直线

表1 c/θ-c直线回归参数及标准吸附Gibbs自由能

图4 1.0 mol/L H2SO4溶液中的缓蚀率与温度的关系

图5 1.0 mol/L H2SO4溶液中ln v-1/T拟合直线

表 2 lnv-1/T直线的腐蚀动力学参数

图6 1.0 mol/L H2SO4溶液中ln(v/T)-1/T拟合直线

表3 ln(v/T)-1/T直线的腐蚀动力学参数

图7 20 ℃时缓蚀率与H2SO4溶液浓度的关系

图8 20 ℃ 时H2SO4溶液中lnv-C拟合直线

表 4 lnv-C直线的腐蚀动力学参数

图9 20 ℃ 时1.0 mol/L H2SO4溶液中ηw-t变化曲线

图10 CRS在20 ℃时含CS-SAS-AAGC的1.0 mol/L H2SO4溶液中的极化曲线

表5 20 ℃时冷轧钢在1.0 mol/L H2SO4溶液中的动电位极化参数

图11 钢在20 ℃时含CS-SAS-AAGC的1.0 mol/L H2SO4溶液中的Nyquist图

图12 拟合EIS的等效电路图

表6 20 ℃时冷轧钢在1.0 mol/L H2SO4中的电化学阻抗谱参数

图13 冷轧钢表面浸泡前后的SEM微观形貌

图14 冷轧钢表面浸泡前后的接触角形貌

图15 CS和CS-SAS-AAGC的分子结构式

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