摘要
运用吸附模型和量子化学的方法研究了1-苯基-3-甲基-5-吡唑啉酮(PMP)和1-苯基-3-乙酯基-5-吡唑啉酮(PCP)作为酸洗缓蚀剂在1 mol/L盐酸中对碳钢的缓蚀机理。通过与吸附等温式拟合,该缓蚀剂在碳钢表面吸附过程符合Langmuir吸附等温线。通过量子化学半经验算法PM3以及从头算法6-31G~*得到的量子化学参数:最高占有分子轨道能量(E_(HOMO))、最低分子空轨道能量(E_(LUMO))、能差(ΔE)以及偶极距(μ)说明,PMP和PCP酮通过与碳钢表面铁原子作用形成配位键和反馈键,在碳钢表面形成一层吸附膜,减缓腐蚀反应的发生。
The inhibition of corrosion of mild steel in 1 mol/L HCl by 1-phenyl-3-methyl-5-pyrazolone(PMP) and 1-phenyl-3-carbethoxy-5-pyrazolone(PCP) was investigated by using mass loss experiment and quantum chemical method:semi-empirical PM3 and density functional theory(DFT) method 6-31G~*.The results of mass loss test showed that the highest inhibition efficiency of PMP and PCP reached 93%and 91%respectively at 1.0×10^(-3) mol/L.A linear fit to Langmuir isotherm was obtained between C/θand C.Quantum chemical parameters such as highest occupied molecular orbital energy(E_(HOMO)),lowest unoccupied molecular orbital energy(E_(LUMO)),energy gap(ΔE) and dipole moment(μ) have been calculated for these compounds by using semi-empirical PM3 and 6-31G~*.The lone electron pair of the nitrogen atom and theπ-electrons of the phenyl make it possible to form coordination bond with iron surface.
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2010年第4期278-282,共5页
Journal of Chinese Society For Corrosion and Protection
基金
国家高技术研究发展计划项目(2008AA09Z317)资助
关键词
缓蚀剂
吡唑啉酮
量子化学
吸附等温线
corrosion inhibitor
pyrazolone
quantum chemical
absorption isotherm
作者简介
曹琨,男,1984年,博士生,研究方向为金属腐蚀与防护
通讯作者 李伟华,E-mail:liweihua@ms.qdio.ac.cn