| Related citation: | Xue Luo,Haijun Huang,Zhenqiang Wang1，2，Zhiyong Wang,Shengtao Zhang,Hongru Li,Fang Gao.Crude Extract of Detergent-Like Gleditsia sinensis lam Exhibiting Self-Organization for Protection of Mild Steel in Harsh Hydrochloric Acid Solution: How to Seek Crude Natural Plant Extracts as Green Corrosion Inhibitors[J].Journal of Harbin Institute Of Technology(New Series),2020,27(5):1-21.DOI:10.11916/j.issn.1005-9113.2020008. |
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| Author Name | Affiliation | | Xue Luo | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China | | Haijun Huang | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China | | Zhenqiang Wang1，2，Zhiyong Wang | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China | | Shengtao Zhang | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China | | Hongru Li | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China | | Fang Gao | College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China |
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| Abstract: |
| This study proposes a thought to employ detergent-like renewable low-cost crude extract of Gleditsia sinensis lam (GSL) as green corrosion inhibitor for mild steel in HCl solution. Crude Gleditsia sinensis lam extract (GSLE) was gained at mild conditions by simply refluxing in ethanol with a Soxhlet extractor. The target GSLE extract exhibited regular self-organization in mixed solvents of organic solvents/H2O such as ethanol/H2O (v/v, 50/50) at room temperature, which was evidenced by different means including scanning electron microscopy, transmission electron microscopy, and dynamic light scattering. The study demonstrates that the yielded assemblies of the crude extract of GSLE displayed chemical adsorption on the studied mild steel sample surfaces. Furthermore, the formed stable crude extract assemblies of GSL presented outstanding anti-corrosion capability in 1.0 mol/L HCl aqueous solution based on electrochemical measurements including polarization curves and impedance spectroscopy. It is discovered that the maximal corrosion inhibition efficiency could reach approximate 95%. The molecular modeling was performed to acquire the nature of frontier orbitals of the main representative chemical components of crude GSLE for deep understanding of chemical interactions with iron. The results presented herein would guide us to seek sustainable environmentally friendly low-cost detergent-like plant crude extracts for corrosion inhibition of various metals in aggressive acid environments |
| Key words: crude extraction of Gleditsia sinensis lam self-organization chemical adsorption corrosion inhibition HCl solution |
| DOI：10.11916/j.issn.1005-9113.2020008 |
| Clc Number:TG178 |
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| Descriptions in Chinese: |
| 类洗涤剂具有自组装的皂角粗提取物在严酷盐酸溶液中保护钢的研究：如何寻求植物粗提取物作为绿色缓蚀剂 罗雪1#，黄海军#1，王震强1, 2，王治永1，张胜涛1*，李红茹1*，高放1* (1. 化学化工学院, 重庆大学，重庆 400044; 2. 化学学院, 重庆师范大学, 重庆 401331) 创新点说明：提出了能够发生自组装的类洗涤剂的皂角粗提取物作为可再生低成本的绿色缓蚀剂，可以用于钢在盐酸溶液中的高效缓蚀作用的思路。 研究目的： 大多数有机缓蚀剂通常通过多步化学合成途径获得，不但可能对环境造成威胁，而且会产生高昂的成本，且合成的有机缓蚀剂可能具有毒性，影响了其大规模应用的潜力。从天然植物中获得环境友好、低毒或无毒的粗提取物可能是金属在HCl溶液中抗腐蚀的优异候选材料。然而一般难以预言何种天然植物粗提取物具有高效的缓蚀作用，使人们不得不“撞轮盘”一样去尝试不同天然植物提取物。为解决上述科学问题，本文提出类洗涤剂的皂角粗提取物可能作为可再生低成本的绿色缓蚀剂，这样粗提取物可通过自组装过程形成自组装体，并有效提高在盐酸水介质中对金属的缓蚀效率。 研究方法： 1）皂角粗提取物的自组装过程 （利用扫描电镜研究） 2）自组装体在金属表面的强烈吸附作用（傅立叶变换红外光谱、拉曼光谱和X射线光电子能谱、原子力测试） 3. 金属缓蚀作用的电化学测试（包括动电位极化曲线测试，交流阻抗测试）。 研究结果： 1） 证明了皂角粗提取物在乙醇/水（v/v，50/50）混合溶剂中的自组装过程。 2） 通过傅立叶变换红外光谱、拉曼光谱和X射线光电子能谱等测试，证实了皂角粗提取物自组装体与钢表面存在强烈化学吸附作用。 3） 通过动电位极化曲线和交流阻抗测试等电化学方法明确了皂角提取物自组装体在1.0 mol/L HCl溶液的缓蚀效率，证明了其具有优异的抗腐蚀性能。 4） 对皂角粗提取物主要化学成分进行分子模拟，进一步了解皂角粗提取物与金属之间的化学作用。 研究结论： 通过系统研究证明了皂角粗提取物形成的自组织体，能够对钢产生强烈的化学吸附作用，并在1.0 mol/L HCl溶液中具有良好的缓蚀性能。本文的研究结果将有助于我们发现类洗涤剂的天然植物粗提取物的自组装体可作为环境友好的可再生缓蚀剂，对于实现金属在强酸介质中的高效缓蚀具有极其重要的意义。 关键词：皂角粗提取物；自组装；化学吸附；缓蚀；金属缓蚀剂；盐酸溶液 |
