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中国腐蚀与防护学报  2021, Vol. 41 Issue (6): 857-863    DOI: 10.11902/1005.4537.2020.173
  研究报告 本期目录 | 过刊浏览 |
十二烷基苯磺酸钠在模拟混凝土孔隙液中对Q235钢缓蚀及吸附行为研究
唐荣茂, 刘光明(), 师超, 张帮彦, 田继红, 甘鸿禹, 刘永强
南昌航空大学材料科学与工程学院 南昌 330063
Inhibition and Adsorption Behavior of Sodium Dodecyl-benzene Sulfonate on Q235 Steel in Simulated Concrete Pore Fluid
TANG Rongmao, LIU Guangming(), SHI Chao, ZHANG Bangyan, TIAN Jihong, GAN Hongyu, LIU Yongqiang
School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China
全文: PDF(3535 KB)   HTML
摘要: 

采用动电位极化曲线、Mott-Schottky曲线与表面形貌分析等方法研究了十二烷基苯磺酸钠 (SDBS) 在0.5 mol/L NaCl和饱和Ca(OH)2溶液 (SCP) 中对Q235钢的缓蚀作用及吸附行为。结果表明,SDBS浓度在0~8.315×10-4 mol/L区间,SDBS在模拟混凝土孔隙液中对Q235钢具有较好的缓蚀效果,其缓蚀率随SDBS浓度的增加而增大。室温下添加8.315×10-4 mol/L的SDBS其缓蚀率可达85.72%,且温度从298 K升至328 K过程中,缓蚀率逐渐降低。SDBS在Q235钢表面的吸附符合Langmuir型吸附等温式,吸附过程为放热、熵增的自发过程。SDBS在Q235钢表面的吸附是以化学吸附为主的混合吸附。SDBS在Q235钢表面形成的吸附膜将Cl-等侵蚀性离子隔离,抑制了Q235钢腐蚀。

关键词 十二烷基苯磺酸钠模拟混凝土孔隙液缓蚀吸附行为    
Abstract

The corrosion inhibition and adsorption behavior of sodium dodecyl benzene sulfonate (SDBS) in the range of 0~8.315×10-4 mol/L on Q235 steel in a simulated concrete pore fluid of 0.5 mol/L NaCl saturated Ca(OH)2 solution were studied by means of potential polarization curve measurement, Mott-Schottky curve measurement and surface morphology analysis. SDBS has a good corrosion inhibition effect on Q235 steel in the simulated concrete pore fluid, and its corrosion inhibition rate increases with the increase of SDBS concentration. The addition of 8.315×10-4 mol/L SDBS has a corrosion inhibition rate of 85.72% at room temperature, and the corrosion inhibition rate gradually decreases when the temperature rises from 298 K to 328 K.The adsorption of SDBS on the surface of Q235 steel conforms to the Langmuir adsorption isotherm. The adsorption process is a spontaneous process of exothermic and entropy increase. The adsorption of SDBS on the surface of Q235 steel is a mixed adsorption based on chemical adsorption. The adsorption film of SDBS formed on the surface of Q235 steel isolates the aggressive ions such as Cl- and inhibits the corrosion of Q235 steel.

Key wordssodium dodecyl benzene sulfonate    simulated concrete pore fluid    corrosion inhibition    adsorption behavior
收稿日期: 2020-09-24     
ZTFLH:  TG147.2  
基金资助:国家自然科学基金(51961028)
通讯作者: 刘光明     E-mail: gemliu@126.com
Corresponding author: LIU Guangming     E-mail: gemliu@126.com
作者简介: 唐荣茂,男,1995年生,硕士生

引用本文:

唐荣茂, 刘光明, 师超, 张帮彦, 田继红, 甘鸿禹, 刘永强. 十二烷基苯磺酸钠在模拟混凝土孔隙液中对Q235钢缓蚀及吸附行为研究[J]. 中国腐蚀与防护学报, 2021, 41(6): 857-863.
Rongmao TANG, Guangming LIU, Chao SHI, Bangyan ZHANG, Jihong TIAN, Hongyu GAN, Yongqiang LIU. Inhibition and Adsorption Behavior of Sodium Dodecyl-benzene Sulfonate on Q235 Steel in Simulated Concrete Pore Fluid. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 857-863.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.173      或      https://www.jcscp.org/CN/Y2021/V41/I6/857

图1  实验装置示意图
图2  Q235钢在含不同浓度SDBS的SCP溶液中的极化曲线
Concentration / mol·L-1Icorr / A·cm-2Ecorr / VEbη / %
01.638×10-5-0.693-0.116---
2.364×10-45.317×10-6-0.670-0.00567.54
4.382×10-44.418×10-6-0.6800.11373.03
6.296×10-43.473×10-6-0.6670.41378.80
8.315×10-42.339×10-6-0.5920.56885.72
表1  Q235钢在含不同浓度SDBS的SCP溶液中的极化曲线拟合参数
图3  Q235钢在含不同浓度SDBS的SCP溶液中的Mott-Schottky曲线
Concentration / mol·L-1Nd / 1021 cm-3Efb / V
02.36-1.03
2.364×10-41.95-0.86
4.382×10-41.72-0.83
6.296×10-41.65-0.80
8.315×10-41.37-0.75
表2  Q235钢在不同浓度SDBS的SCP溶液中的Mott-Schottky曲线拟合参数
图4  Q235钢在SCP溶液中腐蚀24 h的SEM形貌
图5  SDBS在Q235钢表面吸附的等温吸附模型拟合
Adsorption isotherm modelFitting equationCorrelation coefficient R2
Freundlichlgθ=0.18383lgc+0.490640.94258
Langmuirc/θ=1.04163c+1.23597×10-40.98901
Temkinθ=0.32158lgc+1.829180.91834
表3  SDBS在Q235钢表面的等温吸附模型拟合参数
图6  SDBS浓度与温度对腐蚀电流密度和缓蚀率的影响
图7  SDBS在不同温度下的Langmuir型拟合曲线
Temperature KFitting equationCorrelation coefficient R2
298c/θ=1.04163c+1.23597×10-40.98901
308c/θ=1.03617c+1.69264×10-40.98796
318c/θ=1.03723c+2.28696×10-40.99953
328c/θ=1.05663c+3.04946×10-40.99975
表4  SDBS在不同温度下的Langmuir型拟合参数
图8  Q235钢在含不同浓度SDBS的SPC溶液中的Arrhen-ius拟合曲线
图9  lnK与1/T关系图
T / KΔHm / kJ·mol-1ΔGm / kJ·mol-1ΔSm / J·mol-1·K-1KL
298-24.147-32.34627.5138427.6
308-24.147-32.61327.4876121.6
318-24.147-32.87927.4594535.4
328-24.147-33.17927.5373465.0
表5  SDBS在Q235钢表面吸附的热力学参数
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