酸性介质中含N杂环曼尼希碱缓蚀剂对N80钢缓蚀性能研究  

Study on corrosion inhibition of N-heterocyclic Mannich base inhibitor for N80 steel in acid medium

作　　者：袁忆雪 张娇玉 YUAN Yi-xue;ZHANG Jiao-yu(Yangtze University College Of Chemistry&Environmental Engineering,Jingzhou 434023,China)

机构地区：[1]长江大学化学与环境工程学院,湖北荆州434023

出　　处：《化学研究与应用》2025年第2期392-400,共9页Chemical Research and Application

摘　　要：曼尼希碱作为一种缓蚀效率优良的缓蚀剂,可以有效抑制碳钢的腐蚀。为了解决酸化腐蚀问题,合成了一种新型含N杂环曼尼希碱缓蚀剂(XY)。首先以苯并三氮唑、4-苯基-3-硫代氨基脲、甲醛为原料经过曼尼希反应,合成了XY。采用红外光谱仪对合成产物进行表征;采用静态失重法和电化学法评价合成产物在强酸环境中对N80碳钢的缓蚀性能;采用量子化学分析以及分子动力学模拟等方法探究缓蚀剂的缓蚀机理和吸附行为。实验结果表明:在15%HCl介质中XY缓蚀剂对N80碳钢表现出良好的缓蚀性能;电化学研究表明XY缓蚀剂为混合抑制型缓蚀剂;XY在碳钢表面的吸附行为符合Langmuir吸附等温式,能够自发地吸附在碳钢表面;量子化学分析及分子动力学模拟显示,XY缓蚀剂具有多吸附位点,在Fe(110)的晶面以平面方式吸附在低碳钢表面,且能取代吸附在Fe(110)表面的腐蚀粒子以达到防腐蚀目的。As a corrosion inhibitor with good corrosion inhibition efficiency,Mannich base can effectively inhibit the corrosion of carbon steel.In order to solve the problem of acidification corrosion,a new N-heterocyclic Mannich base corrosion inhibitor(XY)was prepared.Firstly,XY was synthesized with benzotriazole,4-phenyi-3-thiosemicarbazide and formaldehyde as starting materials by Mannich reaction.The synthesized product was characterized by infrared spectrometer.The static weight loss method and electrochemical method were used to evaluate the corrosion inhibition performance of the synthesized product on N80 steel in strong acid environment.Quantum chemical analysis,SEM and molecular dynamics simulation were used to explore the corrosion inhibition mechanism and adsorption behavior of corrosion inhibitors.Test experiment result showed that XY corrosion inhibitor had excellent corrosion inhibition performance for N80 steel sheet in 15%HCl acid medium.The electrochemical study showed that the corrosion inhibitor was a mixed inhibitor.The adsorption behavior of XY on the surface of carbon steel accorded with Langmuir adsorption isotherm,and it could spontaneously adsorb on the surface of carbon steel.Quantum Chemical analysis and molecular dynamics simulation showed that the XY corrosion inhibitor had multiple adsorption sites,and the crystal plane of Fe(110)in a plane manner,the surface of low carbon steel could replace corrosive particles absorbed on the surface of Fe(110)to achieve the purpose of anti-corrosion.

关 键 词：曼尼希碱 缓蚀剂 酸性介质 缓蚀作用机理 

分 类 号：O646.6[理学—物理化学]