纳米容器改性环氧涂层对Q235碳钢的防腐蚀性能
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摘要
以纳米SiO_2为载体,采用层层自组装技术在其表面交替沉积天然聚电解质壳聚糖和环保型缓蚀剂聚天冬氨酸,制备出纳米容器,将纳米容器分散到环氧涂层中获得改性环氧涂层。通过Zeta电位、扫描电子显微镜(SEM)和Fourier转换红外线光谱仪(FT-IR)对纳米容器进行了表征,利用电化学阻抗技术对比研究了普通环氧涂层与改性环氧涂层/Q235碳钢体系在3.5%(质量分数)NaCl溶液中的腐蚀行为。结果表明,纳米容器可以有效减缓海水在环氧涂层内部的扩散,提高环氧涂层的电阻,从而增大腐蚀反应阻力;改性后涂层的电化学阻抗在浸泡120 h后仍维持在105Ω·cm2以上,耐蚀性显著增强。
Nano-containers were synthesized via layer by layer(Lb L) self-assembly technique with SiO_2 as core and alternative layers of chitosan and polyaspartic acid inhibitor as shell. Then nano-containers modified epoxy coatings were prepared and applied on carbon steel Q235. The nano-containers were characterized by means of Malvern laser particle size analyzer, Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscope(SEM). In addition, the electrochemical behavior of epoxy coatings/Q235 systems with and without nano-containers in 3.5%(mass fraction) Na Cl solution were investigated through electrochemical impendence spectroscopy(EIS). Results indicated that the corrosion resistance of epoxy coatings had been greatly increased by the incorporating nano-containers, which can effectively reduce the diffusion of water in coating matrix and enhance the coating impedance for corrosion reaction. The impedance value of the modified epoxy coating may be maintained by above 105Ω·cm~2 even after 120 h immersion, revealing the enhanced anticorrosion performance.
Nano-containers were synthesized via layer by layer(Lb L) self-assembly technique with SiO_2 as core and alternative layers of chitosan and polyaspartic acid inhibitor as shell. Then nano-containers modified epoxy coatings were prepared and applied on carbon steel Q235. The nano-containers were characterized by means of Malvern laser particle size analyzer, Fourier transform infrared spectroscopy(FT-IR) and scanning electron microscope(SEM). In addition, the electrochemical behavior of epoxy coatings/Q235 systems with and without nano-containers in 3.5%(mass fraction) Na Cl solution were investigated through electrochemical impendence spectroscopy(EIS). Results indicated that the corrosion resistance of epoxy coatings had been greatly increased by the incorporating nano-containers, which can effectively reduce the diffusion of water in coating matrix and enhance the coating impedance for corrosion reaction. The impedance value of the modified epoxy coating may be maintained by above 105Ω·cm~2 even after 120 h immersion, revealing the enhanced anticorrosion performance.
引文
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[23]Xie D M,Tong S P,Cao J L.Fundamental Knowledge of Applied Electrochemistry[M].Beijing:Chemical Industry Press,2013(谢德明,童少平,曹江林.应用电化学基础[M].北京:化学工业出版社,2013)
[2]Olad A,Naseri B.Preparation,characterization and anticorrosive properties of a novel polyaniline/clinoptilolite nanocomposite[J].Prog.Org.Coat.,2010,67:233
[3]Ge C Y,Yang X G,Hou B R.Synthesis of polyaniline nanofiber and anticorrosion property of polyaniline-epoxy composite coating for Q235 steel[J].J.Coat.Technol.Res.,2012,9(1):59
[4]Liu Y W.Corrosion resistance of anticorrosive coatings of epoxy resin modified by nano Si O2-rare elements[J].Corros.Prot.,2015,36:738(刘元伟.纳米Si O2-稀土元素复合改性环氧树脂防腐蚀涂料的耐蚀性[J].腐蚀与防护,2015,36:738)
[5]Li G L.Epoxy Resin and Epoxy Coating[M].Beijing:Chemical Industry Press,2003(李桂林.环氧树脂与环氧涂料[M].北京:化学工业出版社,2003)
[6]Song J J,Liu C W,Chen H J,et al.Study on modification of anticorrosive epoxy powder coating[J].Thermosetting Resin,2007,22(4):24(宋加金,刘长维,陈红军等.耐腐蚀环氧粉末涂料的改性研究[J].热固性树脂,2007,22(4):24)
[7]Liu G Z,Yang Z S,Zhang Y,et al.Corrosion inhibition performance of imidazoline amide for carbon steel in HCl/NH4Cl-H2O and H2S/NH4HS-H2O solution[J].Corros.Prot.,2016,37:189(刘公召,杨振声,张艳等.咪唑啉酰胺在HCl/NH4Cl-H2O和H2S/NH4HS-H2O体系中对碳钢的缓蚀性能[J].腐蚀与防护,2016,37:189)
[8]Xiang Y G,Cui Y S,Qiao K Q.Corrosion inhibition of A3 steel by lauryl dihydroxyethyl amine oxide in 0.5 mol·L-1H2SO4solution[J].Corros.Prot.,2016,37:30(向云刚,崔益顺,谯康全.十二烷基二羟乙基氧化胺在0.5 mol·L-1H2SO4中对A3钢的缓蚀性能[J].腐蚀与防护,2016,37:30)
[9]Yang P P,Gai S L,Lin J.Functionalized mesoporous silica materials for controlled drug delivery[J].Chem.Soc.Rev.,2012,41:3679
[10]Sun J T,Hong C Y,Pan C Y.Fabrication of PDEAEMA-Coated mesoporous silica nanoparticles and p H-responsive controlled release[J].J.Phys.Chem.,2010,114C:12481
[11]Slowing I I,Trewyn B G,Giri S,et al.Mesoporous silica nanoparticles for drug delivery and biosensing applications[J].Adv.Funct.Mater.,2007,17:1225
[12]Haase M F,Grigoriev D O,M?hwald H,et al.Development of nanoparticle stabilized polymer nanocontainers with high content of the encapsulated active agent and their application in waterborne anticorrosive coatings[J].Adv.Mater.,2012,24:2429
[13]Borisova D,M?hwald H,Shchukin D G.Mesoporous silica nanoparticles for active corrosion protection[J].ACS Nano,2011,5:1939
[14]Saremi M,Yeganeh M.Application of mesoporous silica nanocontainers as smart host of corrosion inhibitor in polypyrrole coatings[J].Corros.Sci.,2014,86:159
[15]Klitzing R V.Internal structure of polyelectrolyte multilayer assemblies[J].Phys.Chem.Chem.Phys.,2006,8:5012
[16]Iler R K.Multilayers of colloidal particles[J].J.Colloid Interface Sci.,1966,21:569
[17]Gittins D I,Caruso F.Multilayered polymer nanocapsules derived from gold nanoparticle templates[J].Adv.Mater.,2000,12:1947
[18]Antunes J C,Pereira C L,Molinos M,et al.Layer-by-layer self-assembly of chitosan and poly(γ-glutamic acid)into polyelectrolyte complexes[J].Biomacromolecules,2011,12:4183
[19]Liu Y H,Li C M,Gu N.The study of the performance of environmentally friendly corrosion inhibitor-polyaspartic acid on carbon steel in tap water[J].Sichuan Environ.,2013,32(4):11(刘英华,李春梅,谷宁.环境友好缓蚀剂聚天冬氨酸在自来水中对碳钢的缓蚀性能研究[J].四川环境,2013,32(4):11)
[20]Xu Q J,Zhu L Y,Cao W M,et al.Inhibition action and adsorption behavior of environment-friendly inhibitor poly-aspartate on copper[J].Acta Phys.-Chim.Sin.,2008,24:1724(徐群杰,朱律均,曹为民等.绿色缓蚀剂聚天冬氨酸对铜的缓蚀性能与吸附行为[J].物理化学学报,2008,24:1724)
[21]Qian B,Wang J,Zheng M,et al.Synergistic effect of polyaspartic acid and iodide ion on corrosion inhibition of mild steel in H2SO4[J].Corros.Sci.,2013,75:184
[22]Cao C N,Zhang J Q.An Introduction to Electrochemical Impedance Spectroscopy[M].Beijing:Science Press,2002(曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002)
[23]Xie D M,Tong S P,Cao J L.Fundamental Knowledge of Applied Electrochemistry[M].Beijing:Chemical Industry Press,2013(谢德明,童少平,曹江林.应用电化学基础[M].北京:化学工业出版社,2013)