摘要
为了提高甘氨酸的缓蚀率,通过分子设计,在甘氨酸分子上引入疏水碳链。运用红外和核磁进行了结构表征,表明成功合成了甘氨酸衍生物。通过失重法、极化曲线、电化学阻抗和扫描电子显微镜对甘氨酸衍生物在1 mol/L HCl中对碳钢的缓蚀性能进行了研究,并进行了热力学分析和缓蚀机理探讨。失重法结果表明甘氨酸衍生物缓蚀剂的缓蚀率高于甘氨酸,当甘氨酸衍生物的添加量为100 mg/L时,缓蚀率就可以达到93.04%。热力学分析表明甘氨酸及其衍生物缓蚀剂在碳钢表面的吸附均遵循Langmuir等温吸附模型,属于物理化学吸附,但甘氨酸衍生物的吸附自由能的绝对值较大,因此其分子与碳钢表面的作用更强。极化曲线表明添加了甘氨酸衍生物的阳极曲线向低电流密度方向移动,表现为阳极缓蚀剂。通过扫描电镜可看出添加了甘氨酸衍生物的碳钢表面光滑,无明显的腐蚀痕迹,表明甘氨酸衍生物对碳钢具有良好的保护作用。
In order to improve the corrosion inhibition efficiency of glycine,hydrophobic carbon chains were introduced onto the glycine mole⁃cule through molecular design.Using infrared spectroscopy(IR)and nuclear magnetic resonance(NMR)to characterize the structure.The test results confirmed the successful synthesis of the glycine derivatives.The corrosion inhibition performance of the glycine derivatives on carbon steel in 1 mol/L HCl was investigated using weight loss method,polarization curves,electrochemical impedance spectroscopy(EIS)and scan⁃ning electron microscopy(SEM).The thermodynamic analysis and corrosion inhibition mechanism were also discussed.The weight⁃loss results showed that the corrosion inhibition efficiency of the glycine derivatives was higher than that of glycine itself.When the concentration of glycine derivatives reached 100 mg/L,the inhibition efficiency reached 93.04%.Thermodynamic analysis revealed that the adsorption of both glycine and its derivatives on the carbon steel surface followed the Langmuir adsorption isotherm,indicating a physical⁃chemical adsorption process.However,the absolute value of the adsorption free energy for the glycine derivative was larger,suggesting a stronger interaction between the molecule and the carbon steel surface.Polarization curves showed that the anodic curve shifted towards a lower current density with the addition of the glycine derivative,behaving as an anodic corrosion inhibitor.SEM images revealed that the carbon steel surface with the glycine deriva⁃tive was smooth,without obvious corrosion marks,indicating that the glycine derivative provided effective protection for the carbon steel.
作者
郭强强
赵海燕
石春杰
GUO Qiangqiang;ZHAO Haiyan;SHI Chunjie(Department of Chemistry,Tangshan Normal College,Tangshan 063000,China;Hebei Key Laboratory of Degradable Polymers,Tangshan 063000,China)
出处
《材料保护》
2025年第1期89-96,共8页
Materials Protection
基金
河北省高等学校科学技术(青年)项目(QN202205)
唐山师范学院校内项目(2222C40)。
关键词
甘氨酸
甘氨酸衍生物
缓蚀作用
碳钢
glycine
glycine derivatives
corrosion inhibition
carbon steel
作者简介
通信作者:郭强强(1982-),博士,副教授,主要从事金属腐蚀与防护研究,E⁃mail:manson101@163.com。
