苯胺三聚体对碳钢在盐酸溶液中的缓蚀性能
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摘要
为了研究苯胺低聚物对金属的缓蚀保护作用,采用化学氧化法制备了一种含N原子型缓蚀剂苯胺三聚体(AT),利用红外光谱和紫外-可见光谱及核磁共振氢谱对其结构进行了表征。通过极化曲线、交流阻抗谱、静态腐蚀失重试验评价了不同浓度AT在1 mol/L盐酸溶液中对碳钢的缓蚀性能,采用扫描电子显微镜(SEM)对腐蚀表面进行分析。结果表明,AT缓蚀剂对金属具有良好的缓蚀性能,当AT含量为100 mg/L时,其缓蚀效率高达99%。利用Langmuir吸附等温线模型结合EDS谱研究AT对金属的缓蚀机理,结果表明AT的缓蚀机理是缓蚀剂在碳钢表面吸附成膜,从而有效阻挡了碳钢表面与盐酸溶液的接触,对金属起到了较好的保护作用。
In order to investigate the corrosion inhibition effect of aniline oligomer on metal substrate,aniline trimer(AT) was prepared by direct mixed oxidation and then characterized by Fourier infrared spectroscopy(FT-IR),ultraviolet and visible spectroscopy(UVVis) and nuclear magnetic resonance(NMR).The corrosion inhibition performance of different content of AT on carbon steel was investigated by polarization curves,electrochemical impedance spectroscopy(EIS) and static weight loss tests in 1 mol/L HC1 solution.Moreover,the surface corrosion morphology was observed by scanning electron microscopy(SEM).Results showed that AT inhibitor had excellent corrosion inhibition effect on metal substrate.When the concentration of AT was 100 mg/L,the inhibition efficiency reached at 99%.The corrosion inhibition mechanism studied by Langmuir adsorption isotherm and EDS analysis was that the inhibitor formed film on the surface of carbon steel,blocking steel from contacting with HCl,so that AT could effectively protect the metal substrate.
In order to investigate the corrosion inhibition effect of aniline oligomer on metal substrate,aniline trimer(AT) was prepared by direct mixed oxidation and then characterized by Fourier infrared spectroscopy(FT-IR),ultraviolet and visible spectroscopy(UVVis) and nuclear magnetic resonance(NMR).The corrosion inhibition performance of different content of AT on carbon steel was investigated by polarization curves,electrochemical impedance spectroscopy(EIS) and static weight loss tests in 1 mol/L HC1 solution.Moreover,the surface corrosion morphology was observed by scanning electron microscopy(SEM).Results showed that AT inhibitor had excellent corrosion inhibition effect on metal substrate.When the concentration of AT was 100 mg/L,the inhibition efficiency reached at 99%.The corrosion inhibition mechanism studied by Langmuir adsorption isotherm and EDS analysis was that the inhibitor formed film on the surface of carbon steel,blocking steel from contacting with HCl,so that AT could effectively protect the metal substrate.
引文
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[3]Wei Y,Li S,Jia X,et al.Electroactive Aniline Oligomers of Well-Defined Structures and Their Polymeric Derivatives[J].Acs Symposium,1999,735:384~398.
[4]Wei Y,Wang W,Yeh J M,et al.Viny-polymer-modified hybrid materials and photoacid-catalysed sol-gel reactions[M].Washington DC:ACS,1995:125~141.
[5]Lu W K,Elsenbaumer R L,Wessling B.Corrosion protection of mild steel by coatings containing polyaniline[J].Synthetic Metals,1995,71(1/3):2 163~2 166.
[6]Ding K,Jia Z B,Ma W S,et al.Thiokol rubber composite coatings for the corrosion protection of mild steel[J].Mater Chem Phys,2002,76:137~142.
[7]Huang K Y,Shiu C L,Wu P S,et al.Effect of aminocapped aniline trimer on corrosion protection and physcal properties for electroactive epoxy thermosets[J].Electrochimica Acta,2009,54:5 400~5 407.
[8]Peng C W,Hsu C H,Lin K H,et al.Electrochemical corrosion protection studies of aniline-capped aniline trimerbased electroactive polyurethane coatings[J].Electrochimica Acta,2011,58:614~620.
[9]Sein Jr L T,Weib Y,Jansena S A.The role of adsorption of aniline trimers on the corrosion inhibition process:a ZINDO/1 study[J].Computational and Theoretical Polymer Science,2001,11:83~88.
[10]Sein Jr L T,Weib Y,Jansena S A.Corrosion inhibition by aniline oligomers through charge transfer[J].Synthetic Metals,2004,143(1):1~12.
[11]Huang K Y,Shiu C L,Wu P S,et al.Effect of amino-capped aniline trimer on corrosion protection and physical properties for electroactive epoxy thermosets[J].Electrochimical Acta,2009,54:5 400~5 407.
[12]Goulart C M,Esteves-Souza A,Martinez-Huitle C A,et al.Experimental and theoretical evaluation of semicarbazones and thiosemicarbazones as organic corrosion inhibitors[J].Corrosion Science,2013,67:281~291.
[13]Huang H Y,Huang T C,Lin J C,et al.Advanced environmentally friendly coatings prepared from amine-capped aniline trimer-based waterborne electroactive polyurethane[J].Materials Chemistry and Physics,2013,137:772~780.
[14]Huang K Y,Jhuo Y S,Wu P S,et al.Electrochemical studies for the electroactivity of amine-capped aniline trimer on the anticorrosion effect of as-prepared polyimide coatings[J].Electrochimica Acta,2011,58:614~620.
[15]魏宝明.金属腐蚀理论与应用[M].北京:化学工业出版社,1984:39~62.
[16]曹楚南,张鉴清.电化学阻抗谱导轮[M].北京:科学出版社,2002:1~20.
[17]De Berry D W.Modifieation of the electrochemical and eorrosion behavior of stainless steel with electroactive coating[J].J Eleetroanal Chem,1985,132(5):1 022~1 026.
[18]赵红冉,周玉丰,刘栓,等.2,3-二巯基丁二酸对铜的缓蚀性能研究[J].表面技术,2015(10):79~85.
[19]谢发之,宣寒.多点位吸附型咪唑啉季铵盐缓蚀剂的合成及其缓蚀性能[J].应用化学,2011,28(1):94~100.
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