食用香料1,4-二硫-2,5-二醇环保型缓蚀剂对X70钢在0.5 mol/L H<sub>2</sub>SO<sub>4</sub>溶液中的缓蚀性能研究

doi:10.11902/1005.4537.2020.100

中国腐蚀与防护学报

2021, Vol. 41

Issue (4): 469-476 DOI: 10.11902/1005.4537.2020.100

研究报告

本期目录 | 过刊浏览

食用香料1,4-二硫-2,5-二醇环保型缓蚀剂对X70钢在0.5 mol/L H₂SO₄溶液中的缓蚀性能研究

谭伯川¹, 张胜涛¹(

), 李文坡¹, 向斌¹, 强玉杰²

^1.重庆大学化学化工学院重庆 400044
^2.中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波 315201

Food Spices 2,5-Dihydroxy-1,4-dithiane as an Eco-friendly Corrosion Inhibitor for X70 Steel in 0.5 mol/L H₂SO₄ Solution

TAN Bochuan¹, ZHANG Shengtao¹(

), LI Wenpo¹, XIANG Bin¹, QIANG Yujie²

^1.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China
^2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

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摘要:

使用实验和理论计算方法研究了食用香料1，4-二硫-2，5-二醇 (DDD) 对X70管线钢在0.5 mol/L硫酸溶液中的缓蚀性能。结果表明，DDD能够有效的抑制X70钢在H₂SO₄介质中的腐蚀，在温度为298 K时，DDD的缓蚀效率可以达到93.6%；随着温度的升高，DDD依然能够展现出良好的缓蚀性能。腐蚀微观形貌观察也证明了DDD能够明显抑制X70钢的腐蚀。吸附等温模型研究结果表明，DDD在X70钢表面的吸附符合Langmuir单层吸附。采用量子化学计算和分子动力学模拟从理论层面讨论了DDD在钢表面的吸附及缓蚀机理。

关键词 ：缓蚀剂, 食用香料, 硫酸, Langmuir吸附, 量子化学计算

Abstract：

The corrosion inhibition performance of 2,5-Dihydroxy-1,4-dithiane (DDD) for X70 pipeline steel in 0.5 mol/L sulfuric acid solution was studied via experimental and theoretical means. Electrochemical experimental data show that DDD can effectively inhibit the corrosion of X70 steel in sulfuric acid solution. The corrosion inhibition efficiency of DDD can reach 93.6% at 298 K. In addition, DDD can still exhibit good corrosion inhibition performance at higher temperatures. The adsorption of DDD on the surface of X70 steel is consistent with Langmuir single layer adsorption. Results of quantum chemical calculation and molecular dynamics simulation also proved the above adsorption and inhibition mechanism of DDD on steel deduced from experimental results.

Key words： corrosion inhibitor food spice sulfuric acid Langmuir adsorption quantum chemistry calculation

收稿日期: 2020-06-11

ZTFLH:

TG174

基金资助:国家自然科学基金(21878029);重庆市研究生科研创新项目(CYB19032);广东扬帆计划(2015YT02D025)

通讯作者: 张胜涛 E-mail: stzhangcqu@163.com

Corresponding author: ZHANG Shengtao E-mail: stzhangcqu@163.com

作者简介: 谭伯川，男，1992年生，博士生

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引用本文:

谭伯川, 张胜涛, 李文坡, 向斌, 强玉杰. 食用香料1,4-二硫-2,5-二醇环保型缓蚀剂对X70钢在0.5 mol/L H₂SO₄溶液中的缓蚀性能研究[J]. 中国腐蚀与防护学报, 2021, 41(4): 469-476.
Bochuan TAN, Shengtao ZHANG, Wenpo LI, Bin XIANG, Yujie QIANG. Food Spices 2,5-Dihydroxy-1,4-dithiane as an Eco-friendly Corrosion Inhibitor for X70 Steel in 0.5 mol/L H₂SO₄ Solution. Journal of Chinese Society for Corrosion and protection, 2021, 41(4): 469-476.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.100 或 https://www.jcscp.org/CN/Y2021/V41/I4/469

图1 DDD的分子结构式

图2 X70钢浸泡在0.5 mol/L硫酸溶液中在温度为298 K时含有不同浓度DDD时电化学阻抗谱图

图3 X70钢在298~313 K温度下浸泡在空白和含有5 mmol/L DDD的0.5 mol/L H2SO4溶液中的电化学阻抗谱

表1 X70钢在298 K下含有不同浓度DDD的0.5 mol/L H2SO4溶液中浸泡时的EIS拟合参数

表2 X70钢在不同温度下浸泡在含有不同浓度DDD的0.5 mol/L H2SO4溶液中EIS的拟合参数

图4 用于拟合电化学阻抗谱数据的等效电路

图5 X70钢在不同条件下的动电位极化曲线

表3 X70钢浸泡在含有不同浓度DDD的0.5 mol/L H2SO4溶液中的极化曲线拟合参数

表4 X70钢在不同温度下浸泡在未含DDD的0.5 mol/L H2SO4溶液中的极化曲线拟合参数

图6 不同等温模型的拟合曲线

图7 X70钢在不同条件下的SEM形貌图

图8 DDD分子优化后的构型，静电势图，HOMO和LUMO轨道的电子云分布

图9 DDD分子在Fe (110) 表面的稳定吸附构型

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