桉叶油对5%草酸介质中黄铜的缓蚀作用  

Corrosion inhibition effect of eucalyptus oil on brass in 5% oxalic acid solution

作　　者：杜玮 伊钟毓 相若函 王涛 石振平 DU Wei;YI Zhongyu;XIANG Ruohan;WANG Tao;SHI Zhenping(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081

出　　处：《电镀与涂饰》2023年第14期64-70,共7页Electroplating & Finishing

基　　金：国铁集团科研计划项目(2119jhA802)。

摘　　要：通过浸泡腐蚀实验、动电位极化曲线测量和电化学阻抗谱研究了桉叶油对黄铜在5%草酸溶液中的缓蚀性能。结果表明,桉叶油浓度越高对黄铜的保护作用越大。扫描电镜和原子力显微镜对铜腐蚀后表面形貌的表征也证明了以上结论。量子化学理论计算表明,桉叶油的高EHOMO(最高占据分子轨道能量)、低ELUMO(最低未占分子轨道能量)和小带隙都显示出其优异的自发吸附能力。分子动力学计算表明,桉叶油分子在黄铜表面排列后形成保护层,保证其优异的缓蚀性能。The inhibition effect of eucalyptus oil on the corrosion of brass in 5% oxalic acid solution was studied by weight loss test,potentiodynamic polarization curve measurement,and electrochemical impedance spectroscopy(EIS).The results showed that the higher the concentration of eucalyptus oil was,the better protection performance it had for brass.This was also proved by the characterization of surface morphology by scanning electron microscopy(SEM) and atomic force microscopy(AFM).The theoretical calculation of quantum chemistry indicated that eucalyptus oil has excellent spontaneous adsorbability due to its high EHOMO(highest occupied molecular orbital energy),low ELUMO(lowest unoccupied molecular orbital energy),and small band gap.The molecular dynamics calculation showed that the eucalyptus oil molecules arrange on the brass surface and form a protective layer which has excellent corrosion inhibition performance.

关 键 词：黄铜 桉叶油 缓蚀剂 吸附 电化学 分子动力学 量子化学 

分 类 号：TG174.42[金属学及工艺—金属表面处理]