In this work, the functional groups of Eurohypnum leptothallum extract (ELE) were extracted by aqueous immersion and identified by FTIR. The corrosion inhibitory effect of ELE as a natural plant corrosion inhibitor on pure iron in 0.5 mol L−1 H2SO4 solution was investigated by test methods such as the weight loss method, electrochemical behaviour and detection of metal surface topography. The results show that ELE has a positive inhibitory effect on the corrosion behaviour of pure iron in 0.5 mol L−1 H2SO4 solution, and the higher the concentration of ELE, the greater the corrosion inhibitory effect. It can still reach 83.97 % at high temperatures. The results of SEM examination and contact angle measurements show that the corrosion degree of the metal decreases significantly after the additon of ELE and that the hydrophobicity of the metal surface increases. The adsorption of ELE on the surface of pure iron tends to isothermal Langmuir adsorption and, as a mixed corrosion inhibitor, the charge transfer resistance of the system increases significantly and the capacitance value of the electrical double layer decreases significantly.

中文翻译：

---

Eurohypnum leptothallum 提取物在 0.5 mol L−1 H2SO4 中对纯铁的腐蚀抑制：基于实验和 GC-MS 的研究

在这项工作中，功能组细叶欧洲兰提取物（ELE）通过水浸提取并通过 FTIR 鉴定。ELE作为天然植物缓蚀剂在0.5 mol·L-1中对纯铁的缓蚀效果−1H2所以4通过失重法、电化学行为、金属表面形貌检测等测试方法对溶液进行了研究。结果表明，ELE对0.5 mol·L-1纯铁的腐蚀行为具有积极的抑制作用−1H2所以4溶液中，ELE浓度越高，缓蚀效果越大。在高温下仍能达到83.97%。SEM观察和接触角测量结果表明，添加ELE后金属的腐蚀程度显着降低，金属表面的疏水性增加。ELE在纯铁表面的吸附趋于等温朗缪尔吸附，作为混合缓蚀剂，体系的电荷转移电阻显着增加，双电层电容值显着降低。