菠菜提取物在柠檬酸体系中对Q235钢的缓蚀性能
收稿日期: 2023-06-26
修回日期: 2023-07-16
录用日期: 2023-08-20
网络出版日期: 2024-01-08
基金资助
河北省自然科学基金(D2022105004);唐山师范学院基金项目(2022C42)资助
Inhibitory Performance of Spinach Extract on the Corrosion of Q235 Steel in a Citric Acid System
Received date: 2023-06-26
Revised date: 2023-07-16
Accepted date: 2023-08-20
Online published: 2024-01-08
和
和吸附性能参数
和
的影响。结果表明:SPE的主要成分为叶绿素,SPE在0.5 mol/L CA溶液中具有较好的稳定性。SPE明显减缓了0.5 mol/L CA溶液中Q235钢的腐蚀速率,属于抑制阴、阳极的混合型缓蚀剂。随SPE浓度的增大,阴、阳极电流减少,活性腐蚀部位被阻断,腐蚀速率降低,缓蚀效率增大。在温度303 K、SPE浓度2.134 g/L的条件下,根据失重法、PDP、LPR和EIS计算出的缓蚀效率均在80%以上。随体系温度的升高SPE对Q235钢的缓蚀效率降低,但变化较小。与空白体系相比,添加SPE后体系的活化能Ea明显增大。SPE的有效成分在Q235钢表面的吸附符合Langmuir等温式,且以物理吸附为主,属于单分子层的吸附。在0.5 mol/L CA溶液体系中,SPE对Q235钢具有较好的缓蚀性能,是一种在酸洗领域中有着较好应用前景的绿色缓蚀剂,可以为植物提取类缓蚀剂的发展提供一定参考。
关键词： 菠菜提取物; 叶绿素; 缓蚀剂; Langmuir单层吸附; 电化学测试
柳鑫华, 王赢, 罗宝晶, 张源, 李繁麟, 刘会媛, 胡海凤, 舒世立, 张青, 王磊, 刘斯瑜, 古林艳, 张国炜 . 菠菜提取物在柠檬酸体系中对Q235钢的缓蚀性能[J]. 材料保护, 2023 , 56(12) : 65 -78 . DOI: 10.16577/j.issn.1001-1560.2023.0290
were studied by calculation. Results showed that chlorophyll was the main component of SPE, which exhibited good stability in a 0.5 mol/L CA solution. Furthermore, SPE significantly reduced the corrosion rate of Q235 steel in the 0.5 mol/L CA medium, acting as a mixed corrosion inhibitor for both cathodic and anodic reactions. With the increase of SPE concentration, both cathodic and anodic currents were reduced, active corrosion sites were blocked, the corrosion rate was decreased, and the corrosion inhibition efficiency was enhanced. The corrosion inhibition efficiency of Q235 steel obtained by weight loss method, PDP, LPR and EIS was more than 80% with 2.134 g/L of SPE concentration at 303 K. With the increase of system temperature, the corrosion inhibition efficiency of SPE on Q235 steel decreased, but the change was smaller. Compared to the blank system, the activation energy (Ea) of the system significantly increased after the addition of SPE. The effective components of SPE adsorped to the surface of Q235 steel in accordance with the Langmuir isotherm, predominantly through physical adsorption, and were characterized as monolayer adsorption. SPE exhibited good corrosion inhibition performance for Q235 steel in a 0.5 mol/L CA solution system, which was a green corrosion inhibitor with good application prospects in the pickling field. It could provide certain guidance for the development of plant extract-based corrosion inhibitors.
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