薄层液膜下空间电场对碳酸环己胺缓蚀性能的影响
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摘要
研究了薄层液膜下空间电场对碳酸环己胺(CHC)缓蚀性能的影响。结果表明,CHC主要抑制碳钢腐蚀反应的阳极过程,对碳钢腐蚀具有显著的缓蚀效果,但施加垂直方向的电场后CHC缓蚀效果显著下降。扫描电镜和X射线光电子能谱分析表明,电场作用导致碳钢表面的腐蚀形貌出现明显变化,CHC在碳钢表面的吸附量显著减少。CHC分子的偶极距(μ)、最高占据轨道能(E_(HOMO))、最低空余轨道能(E_(LUMO))以及能隙(?E=E_(LUMO)-E_(HOMO))在不同的电场条件下的变化规律表明,电场会削弱CHC的反应活性和吸附能力,从而降低其缓蚀效率。
Effect of external electric field on the inhibition efficiency of cyclohexylamine carbonate(CHC) for carbon steel N80 beneath adsorbed thin electrolyte layers(ATEL) was investigated by means of electrochemical measurement,scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).The results illustrated that CHC mainly suppresses the anodic corrosion reaction and has strong inhibition effect on the carbon steel corrosion.When an electric field vertical to the steel was applied,the inhibition efficiency of CHC decreased greatly and the adsorption of CHC on the carbon steel surface decreased significantly,so that the surface morphology varied quite obviously after corrosion test.The relevant quantum chemical parameters related to the corrosion inhibition efficiency of CHC were calculated by materials studio software.The acquired parameters such as dipole moment(μ),E_(HOMO),E_(LUMO) and ?E all implied that the reactivity and adsorption ability of CHC were reduced significantly after applying external electric field,which affects the inhibition efficiency of CHC.
Effect of external electric field on the inhibition efficiency of cyclohexylamine carbonate(CHC) for carbon steel N80 beneath adsorbed thin electrolyte layers(ATEL) was investigated by means of electrochemical measurement,scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS).The results illustrated that CHC mainly suppresses the anodic corrosion reaction and has strong inhibition effect on the carbon steel corrosion.When an electric field vertical to the steel was applied,the inhibition efficiency of CHC decreased greatly and the adsorption of CHC on the carbon steel surface decreased significantly,so that the surface morphology varied quite obviously after corrosion test.The relevant quantum chemical parameters related to the corrosion inhibition efficiency of CHC were calculated by materials studio software.The acquired parameters such as dipole moment(μ),E_(HOMO),E_(LUMO) and ?E all implied that the reactivity and adsorption ability of CHC were reduced significantly after applying external electric field,which affects the inhibition efficiency of CHC.
引文
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[2]Ju Y L,Li Y.Research progress of vapor phase inhibitors[J].J.Chin.Soc.Corros.Prot.,2014,34:27(鞠玉琳,李焰.气相缓蚀剂的研究进展[J].中国腐蚀与防护学报,2014,34:27
[3]Rammelt U,Koehler S,Reinhard G.Efficiency of vapor phase corrosion inhibitors for ferrous metals in neutral and alkaline solutions[J].Corrosion,2011,67:045001
[4]Shi W Y,Cang H,Xia Y,et al.Quantum chemical and molecular dynamics studies on the corrosion inhibition mechanism of five kinds of amino acids[J].J.Yancheng Inst.Technol.(Nat.Sci.Ed.),2011,24(2):25(石文艳,仓辉,夏媛等.5种氨基酸缓蚀机理的量子化学及分子动力学研究[J].盐城工学院学报(自然科学版),2011,24(2):25)
[5]Yang H Y,Chen J J,Cao C N,et al.Study on corrosion and inhibition mechanism in H2S aqueous solutions-VI.The relationship between molecular structure of imidazoline derivatives and inhibition performance in H2S solutions[J].J.Chin.Soc.Corros.Prot.,2002,22:148(杨怀玉,陈家坚,曹楚南等.H2S水溶液中的腐蚀与缓蚀作用机理的研究—VI.H2S溶液中咪唑啉衍生物分子结构与其缓蚀性能的关系[J].中国腐蚀与防护学报,2002,22:148
[6]Taleb M,Didierjean C,Jelsch C,et al.Equilibrium kinetics of lysozyme crystallization under an external electric field[J].J.Cryst.Growth,2001,232:250
[7]Tan Y,Huang X,Xu X,et al.Theoretical studies on the effect of electric field on the structures of metal string complex Ni3(dpa)4Cl2[J].Chem.J.Chin.Univ.,2012,33:1278(谭莹,黄晓,许旋等.电场对Ni3(dpa)4Cl2金属串配合物结构影响的理论研究[J].高等学校化学学报,2012,33:1278)
[8]Yue Q,Shao Z Z,Chang S L,et al.Adsorption of gas molecules on monolayer Mo S2and effect of applied electric field[J].Nanoscale Res.Lett.,2013,8:425
[9]Li Y D.The influence of electric field on electron density of molecule wires[J].Chin.J.Low Temp.Phys.,2008,30:182(李英德.电场对分子线电荷密度的影响[J].低温物理学报,2008,30:182)
[10]Grüber C,Buss V.Quantum-mechanically calculated properties for the development of quantitative structure-activity relationships(QSAR'S).p KA-values of phenols and aromatic and aliphatic carboxylic acids[J].Chemosphere,1989,19:1595
[11]Zhang C,Duan H B,Zhao J M.Synergistic inhibition effect of imidazoline derivative and L-cysteine on carbon steel corrosion in a CO2-saturated brine solution[J].Corros.Sci.,2016,112:160
[12]Hu Q S,Hu J C,Yu J H,et al.Quantitative structure-activity relationship studies on corrosion inhibition of benzimidazole and its derivatives[J].J.Chin.Soc.Corros.Prot.,2010,30:354(胡松青,胡建春,郁金华等.苯并咪唑及其衍生物缓蚀性能的定量构效关系研究[J].中国腐蚀与防护学报,2010,30:354)
[13]Zhang D Q,Gao L X,Zhou G D.Molecular design and synergistic effect of morpholinium type volatile corrosion inhibitor[J].J.Chin.Soc.Corros.Prot.,2006,26:120(张大全,高立新,周国定.吗啉衍生物气相缓蚀剂的分子设计和缓蚀协同作用研究[J].中国腐蚀与防护学报,2006,26:120)
[14]Li Y,Guo Y,Cai H,et al.Quantum chemistry study of the structure-activity relationship of corrosion inhibitor[J].Corros.Prot.,2007,28:392(李酽,郭英,才华等.缓蚀剂构效关系的量子化学研究[J].腐蚀与防护,2007,28:392)
[15]Khalil N.Quantum chemical approach of corrosion inhibition[J].Electrochim.Acta,2003,48:2635