摘要:
聚环氧琥珀酸(PESA)作为绿色阻垢剂,具有较好的阻垢作用,但其缓蚀作用一般。为增强其缓蚀能力,采用L-半胱氨酸和氨基乙磺酸作为改性剂对PESA进行改性得到聚环氧琥珀酸衍生物PESA-Lcy-Sea,利用红外光谱仪(FTIR)和氢核磁共振谱仪(NMR)对PESA-Lcy-Sea的结构进行表征,通过热重分析(TGA)研究PESA-Lcy-Sea的热稳定性,用失重法和电化学法探究PESA-Lcy-Sea的缓蚀性能,并以扫描电镜(SEM)和接触角对添加PESA-Lcy-Sea后Q235碳钢试片的形貌和表面变化情况进行分析。结果表明,PESA-Lcy-Sea具有PESA、L-半胱氨酸和氨基乙磺酸的结构官能团,合成成功,具有良好的热稳定性;PESA-Lcy-Sea在0.5 mol/L HCl溶液中对Q235钢有较好的缓蚀作用,在加药量为400 mg/L时,缓蚀率最高可达81.23%;PESA-Lcy-Sea分子在碳钢表面的吸附符合Langmuir吸附等温线;极化曲线证明了PESA-Lcy-Sea为混合型缓蚀剂;钢表面的SEM和接触角分析证明了PESA-Lcy-Sea在其表面形成了保护膜,从而有效减缓了溶液对Q235钢的腐蚀。
关键词:
聚环氧琥珀酸衍生物,
碳钢,
腐蚀,
电化学,
接触角
Abstract:
Polyepoxysuccinic acid (PESA), as a green scale inhibitor, has good scale inhibition, but its corrosion inhibition is not so good. In order to enhance its corrosion inhibition ability, PESA was modified with L-cysteine and taurine as modifiers to obtain a polyepoxysuccinic acid derivative(PESA-Lcy-Sea). The structure of PESA-Lcy-Sea was characterized by infrared spectroscopy (FTIR) and hydrogen nuclear magnetic resonance spectroscopy (NMR). The thermal stability of PESA-Lcy-Sea was studied by thermogravimetric analysis(TGA), the corrosion inhibition performance of PESA-Lcy-Sea was investigated by weight loss method and electrochemical method, and the morphology and surface changes of Q235 carbon steel samples after adding PESA-Lcy-Sea were analyzed by SEM and contact angle. The results showed that PESA-Lcy-Sea had the structural functional groups of PESA, L-cysteine and taurine, which was successfully synthesized and had good thermal stability. PESA-Lcy-Sea had good corrosion inhibition on Q235 steel in 0.5 mol/L HCl solution, and the highest corrosion inhibition rate could reach 81.23% when the dosage was 400 mg/L. The adsorption of PESA-Lcy-Sea molecules on the surface of carbon steel conformed to the Langmuir adsorption isotherm. The polarization curve proved that PESA-Lcy-Sea was a mixed corrosion inhibitor. SEM and contact angle analysis of the steel surface proved that a protective film was formed on the surface by PESA-Lcy-Sea, which effectively slowed down the corrosion of Q235 steel in acid solution.
Key words:
polyepoxysuccinic acid derivatives,
carbon steel,
corrosion,
electrochemistry,
contact angle
中图分类号:
刘会媛, 柳鑫华, 关俊霞, 王瀛, 舒世立, 王磊, 李雨龙, 闫子萱, 夏雨博, 杜嘉瑞, 周鑫, 向和琼, 张心媛. 聚环氧琥珀酸衍生物在酸介质中的缓蚀性能[J]. 工业水处理, 2025, 45(3): 137-143.
Huiyuan LIU, Xinhua LIU, Junxia GUAN, Ying WANG, Shili SHU, Lei WANG, Yulong LI, Zixuan YAN, Yubo XIA, Jiarui DU, Xin ZHOU, Heqiong XIANG, Xinyuan ZHANG. Corrosion inhibition properties of polyepoxysuccinic acid derivatives in acid media[J]. Industrial Water Treatment, 2025, 45(3): 137-143.