Tian Zicheng,Li Guolou,Zhou Xiaorong*,et al.Study on inhibition performance of extracted polysaccharides from mint leaves for pickling of carbon steel[J].Plating & Finishing,2024,(6):34-41.[doi:10.3969/j.issn.1001-3849.2024.06.005]
薄荷叶多糖作为碳钢酸洗缓蚀剂的研究
- Title:
- Study on inhibition performance of extracted polysaccharides from mint leaves for pickling of carbon steel
- Keywords:
- extract from mint leaves ; polysaccharide ; corrosion inhibitor ; weight loss method
- 分类号:
- TG174.42
- 文献标志码:
- A
- 摘要:
- 以水作为提取剂，以乙醇为沉淀剂，从薄荷叶中提取并分离出多糖类物质（ EPM ），作为碳钢酸洗缓蚀剂。在 2 mol·L -1 HCl 水溶液中，采用失重法测试了 20~60 o C 范围内 EPM 对碳钢的缓蚀性能。研究表明： EPM 对 碳钢在 2 mol·L -1 HCl 水溶液中的腐蚀有一定的抑制作用，随着 EPM 浓度的增大，缓蚀效率增大，当浓度达到 320 mg·L -1 以后，缓蚀效率基本保持不变。当温度为 20 o C 、 EPM 浓度为 400 mg·L -1 时，缓蚀效率达到最高，为 89.45% 。随着酸洗温度的升高， EPM 的缓蚀效率降低。当温度为 60 o C 、 EPM 的浓度为 400 mg·L -1 时，缓蚀效率降低为 49.39% 。通过热力学和动力学综合分析可知， EPM 的缓蚀作用归因于在碳钢表面形成单分子吸附层，服从 Langmuir 吸附模型，为物理吸附和化学吸附共存的放热过程， EPM 吸附层增加了碳钢在 HCl 水溶液中的腐蚀反应的表观活化能（ E a ）。将 EPM 和未分离多糖的薄荷叶总提取物（ EM ）对碳钢的缓蚀作用进行比较研究，发现在常温下使用时 EPM 的缓蚀性能优于 EM ，当腐蚀温度达到 40 o C 以上时， EPM 的缓蚀性能下降，低于 EM 。
- Abstract:
- ： Polysaccharide （ EPM ） was extracted and separated from mint leaves using water as extractant and ethanol as precipitator ， which was used as corrosion inhibitor for pickling of carbon steel. The corrosion inhibition performance of EPM on carbon steel was tested using weight loss method in 2 mol·L -1 HCl aqueous solution at temperature range of 20-60 o C. The results showed that EPM had a certain inhibitory effect on the corrosion of carbon steel in 2 mol·L -1 HCl aqueous solution. With the increase of EPM concentration ， the corrosion inhibition efficiency increased. The inhibition efficiency was relatively stable when the concentration of EPM reached 320 mg·L -1 . The maximum efficiency was 89.45% when the temperature was 20 o C and EPM concentration was 400 mg·L -1 . The corrosion inhibition efficiency of EPM decreased with the increase of pickling temperature. The inhibition efficiency decreased to 49.39% when the temperature was 60 o C and EPM concentration was 400 mg·L -1 . According to the comprehensive analysis of thermodynamics and kinetics ， the inhibition effect of EPM was attributed to the formation of a single molecular adsorption layer on the surface of carbon steel ， which followed the Langmuir adsorption model.It was an exothermic process with the coexistence of physical adsorption and chemical adsorption. The apparent activation energy （ E a ） of the corrosion process of carbon steel with EPM in HCl aqueous solution was increased. The inhibition effect of EPM and the extract of mint leaves （ EM ） on carbon steel were compared. It was found that the inhibition performance of EPM was better than that of EM at room temperature. When the corrosion temperature was above 40 o C ， the inhibition performance of EPM decreased and was lower than that of EM.
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备注/Memo
收稿日期： 2023-08-28 修回日期： 2023-11-23 作者简介： 田子诚（ 2003 —），男，本科在读 ， email ： 3259253209@qq.com * 通信作者： 周晓荣（ 1977 —），女，博士研究生，副教授， email ： zxrwhpu@163.com 基金项目： 2023 年校立大学生科研项目；湖北省自然科学基金项目（ 2020CFB777 ）?/html>