氨基酸和磺酸改性聚天冬氨酸的阻垢缓蚀性能研究  

Study on the scale and corrosion inhibition of amino acid andsulfonic acid modified polyaspartic acid

作　　者：余嵘 许杨 张弛 段妍文 YU Rong;XU Yang;ZHANG Chi;DUAN Yanwen(School of Urban Planning and Municipal Engineering,Xi'an Polytechnic University,Xi'an 710048,China)

机构地区：[1]西安工程大学,城市规划与市政工程学院,西安710048

出　　处：《功能材料》2023年第12期12169-12176,共8页Journal of Functional Materials

基　　金：陕西省重点研发计划项目(2021NY-188)。

摘　　要：为了提高聚天冬氨酸(PASP)的阻垢缓蚀能力,采用色氨酸(Trp)及氨基甲磺酸(ASA)对PASP进行接枝改性,制备出改性PASP阻垢缓蚀剂Trp-ASA-PASP。利用红外光谱表征合成产物,碳酸钙临界过饱和法结合场发射扫描电镜(SEM)分析PASP与Trp-ASA-PASP的阻垢性能。结果显示随着阻垢剂投加量增加,Trp-ASA-PASP的相对过饱和值(Sr)始终高于PASP,说明Trp-ASA-PASP阻垢能力优于PASP。利用电化学法结合失重法评价Trp-ASA-PASP对A3碳钢的缓蚀性能;基于密度泛函理论使用量子化学计算方法,比较PASP和Trp-ASA-PASP的反应活性位点及轨道能量间隙(ΔE),及其与金属的吸附结合能力,从而进一步揭示Trp-ASA-PASP的缓蚀机理。结果显示,Trp-ASA-PASP是偏向阳极的阴阳混合型缓蚀剂,缓蚀率随其浓度的增大而增大;轨道能量间隙ΔE(Trp-ASA-PASP)为4.3482 eV小于ΔE(PASP)的6.9634 eV,说明Trp-ASA-PASP更易与金属作用,且Trp-ASA-PASP的反应活性位点主要位于侧链的磺酸基上,较PASP更容易接受来自金属表面的电子,与金属相互作用形成金属表面的保护膜从而达到缓蚀效果。To improve the scale and corrosion inhibition ability of polyaspartic acid(PASP),the modified PASP scale and corrosion inhibitor Trp-ASA-PASP was prepared by graft modification of PASP with tryptophan(Trp)and aminomethanesulfonic acid(ASA).The synthetic products were characterized by infrared spectroscopy,and the critical supersaturation method of calcium carbonate combined with field emission scanning electron microscopy(SEM)was used to analyze the scale and corrosion inhibition performance of PASP and Trp-ASA-PASP.The results showed that the relative supersaturation value(Sr)of Trp-ASA-PASP was always higher than that of PASP as the scale inhibitor dosage increased,indicating that the scale inhibition ability of Trp-ASA-PASP was better than that of PASP.The corrosion inhibition performance of Trp-ASA-PASP on A3 carbon steel was evaluated by electrochemical method combined with weight loss method.Quantum chemical calculations based on density flooding theory were used to compare the scale inhibition performance of Trp-ASA-PASP with that of PASP.The reactive sites and orbital energy gap(ΔE)of PASP and Trp-ASA-PASP,and their adsorption and binding ability to metals were compared based on density flooding theory to further reveal the corrosion inhibition mechanism of Trp-ASA-PASP.The results showed that Trp-ASA-PASP is a mixed cathodic-anodic corrosion inhibitor with an anodic bias,and the corrosion inhibition rate increased with the increase of its concentration.The orbital energy gapΔE(Trp-ASA-PASP)was 4.3482 eV smaller than that ofΔE(PASP)which was 6.9634 eV,indicating that Trp-ASA-PASP is more likely to interact with metals,and the reaction active site of Trp-ASA-PASP was mainly in the orbital energy gap.The reactive site of Trp-ASA-PASP is mainly located on the sulfonic acid group of the side chain,which is more likely to accept electrons from the metal surface than PASP and interact with the metal to form a protective film on the metal surface to achieve the corrosion inhibition effect.

关 键 词：聚天冬氨酸 阻垢缓蚀剂 碳酸钙临界过饱和法 量子化学计算 

分 类 号：TQ317[化学工程—高聚物工业]