ES150型纳米改性有机硅涂料的防护作用及其应用
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摘要
采用物理混合的方法制备了ES150型纳米改性有机硅涂料,并采用电化学阻抗技术、盐雾腐蚀实验和浸泡实验研究了涂层的防腐蚀性能。结果表明,清漆涂层存在大量的微孔,严重影响涂层的防护性能。纳米改性复合涂层的致密度显著提高,经6000 h盐水浸泡和5000 h中性盐雾腐蚀实验,涂层未出现起泡、剥落等破坏,涂层下的基体镁合金未发生腐蚀。在浸泡过程中涂层的阻抗保持在109Ω·cm2以上,具有优异的耐腐蚀性能。SO2加速腐蚀实验表明,ES150型纳米复合有机硅涂料实现了对飞机零部件在恶劣环境中的有效防护,实际应用效果显著。
A novel protective coating, namely ES150 silicone modified with nano-particulate of metal was prepared by physical blending process, which was further applied on AZ91 D Mg-alloy, and then the corrosion resistance of the coated alloy was evaluated by electrochemical impedance spectroscopy(EIS), immersion test in 3.5%(mass fraction) Na Cl solution and neutral salt spray exposure. The results indicated that lots of micropores could be observed within the silicone lacquer coating, which deteriorates its protective efficiency. In contrast, the number of micropores decreased greatly for the modified silicone coatings with nano-particulate of metal. The modified ES150 coatings can withstand 6000 h immersion in3.5%Na Cl solution and 5000 h neutral salt spray exposure without blistering, peeling off or corrosion. Theimpedance of the coatings is larger than 109Ω·cm2 during immersion in 3.5%Na Cl solution. The SO2 accelerated corrosion experiments revealed that the coatings provide sufficient protectiveness for airplane workpieces.
A novel protective coating, namely ES150 silicone modified with nano-particulate of metal was prepared by physical blending process, which was further applied on AZ91 D Mg-alloy, and then the corrosion resistance of the coated alloy was evaluated by electrochemical impedance spectroscopy(EIS), immersion test in 3.5%(mass fraction) Na Cl solution and neutral salt spray exposure. The results indicated that lots of micropores could be observed within the silicone lacquer coating, which deteriorates its protective efficiency. In contrast, the number of micropores decreased greatly for the modified silicone coatings with nano-particulate of metal. The modified ES150 coatings can withstand 6000 h immersion in3.5%Na Cl solution and 5000 h neutral salt spray exposure without blistering, peeling off or corrosion. Theimpedance of the coatings is larger than 109Ω·cm2 during immersion in 3.5%Na Cl solution. The SO2 accelerated corrosion experiments revealed that the coatings provide sufficient protectiveness for airplane workpieces.
引文
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[2]Yang Q,Luo J L.Effects of hydrogen and tensile stress on the breakdown of passive films on type 304 stainless steel[J].Electrochim.Acta,2001,46:851
[3]Li P,Qin P,Pang S J,et al.Effect of SO2on the corrosion behaviors of Co Cr Fe Ni Ti0.5 alloy anti-alkali metal sulfate[J].Rare Met.Mater Eng.,2017,46:680(李萍,秦鹏,庞胜娇等.SO2对Co Cr Fe Ni Ti0.5合金耐碱金属硫酸盐腐蚀行为的影响[J].稀有金属材料与工程,2017,46:680)
[4]Gilewicz-Wolter J,?urekt Z.Corrosion of iron in sulfur dioxide at0.1 MPa[J].Oxid.Met.,1996,45:469
[5]Oh S J,Cook D C,Townsend H E.Atmospheric corrosion of different steels in marine,rural and industrial environments[J].Corros.Sci.,1999,41:1687
[6]Sasaki T,Kanagawa R,Ohtsuka T,et al.Corrosion products of tin in humid air containing sulfur dioxide and nitrogen dioxide at room temperature[J].Corros.Sci.,2003,45:847
[7]Hellstr?m K,Hall J,Malmberg P,et al.Mitigation of fireside corrosion in power plants:The combined effect of sulfur dioxide and potassium chloride on the corrosion of a Fe Cr Al alloy[J].Energy Fuels,2014,28:6116
[8]Sun S Q,Zheng Q F,Li D F,et al.Long-term atmospheric corrosion behaviour of aluminium alloys 2024 and 7075 in urban,coastal and industrial environments[J].Corros.Sci.,2009,51:719
[9]Wang C,Wang Z Y,Ke W.Initial corrosion behavior of carbon steel Q235 in the atmosphere with SO2[J].Acta Metall.Sin.,2008,44:729(汪川,王振尧,柯伟.Q235碳钢在SO2气体中的初期腐蚀行为[J].金属学报,2008,44:729)
[10]Oguzie E E.Evaluation of the inhibitive effect of some plant extracts on the acid corrosion of mild steel[J].Corros.Sci.,2008,50:2993
[11]Masahashi N,Kimura G,Oku M,et al.Corrosion behavior of ironaluminum alloys and its composite steel in sulfuric acid[J].Corros.Sci.,2006,48:829
[12]Khaled K F.Experimental and atomistic simulation studies of corrosion inhibition of copper by a new benzotriazole derivative in acid medium[J].Electrochim.Acta,2009,54:4345
[13]Barletta M,Venettacci S,Puopolo M,et al.Design and manufacturing of protective barriers on Fe 430 B substrates by phenyl methyl polysiloxane coatings:micromechanical response,chemical inertness,and corrosion resistance[J].J.Coat.Technol.Res.,2015,12:333
[14]Balakrishnan V,Rau S R,Kasi R,et al.Evaluation of heat resistant properties of silicone-acrylic polyol coating by electrochemical methods[J].Pigm.Resin.Technol.,2013,42:117
[15]Xiao J,Chen J M,Zhou H D,et al.Study of several organic resin coatings as anti-ablation coatings for supersonic craft control actuator[J].Mater.Sci.Eng.,2007,A452/453:23
[16]Mi?kovi?-Stankovi?V B,Zotovi?J B,Ka?arevi?-Popovi?Z,et al.Corrosion behaviour of epoxy coatings electrodeposited on steel electrochemically modified by Zn-Ni alloy[J].Electrochim.Acta,1999,44:4269
[17]Stratmann M,Feser R,Leng A.Corrosion protection by organic films[J].Electrochim.Acta,1994,39:1207
[18]Souto R M,González-García Y,Izquierdo J,et al.Examination of organic coatings on metallic substrates by scanning electrochemical microscopy in feedback mode:Revealing the early stages of coating breakdown in corrosive environments[J].Corros.Sci.,2010,52:748
[19]Grundmeier G,Schmidt W,Stratmann M.Corrosion protection by organic coatings:Electrochemical mechanism and novel methods of investigation[J].Electrochim.Acta,2000,45:2515
[20]Dong Y H,Zhou Q.Relationship between ion transport and the failure behavior of epoxy resin coatings[J].Corros.Sci.,2014,78:22
[21]Ramezanzadeh B,Ahmadi A,Mahdavian M.Enhancement of the corrosion protection performance and cathodic delamination resistance of epoxy coating through treatment of steel substrate by a novel nanometric sol-gel based silane composite film filled with functionalized graphene oxide nanosheets[J].Corros.Sci.,2016,109:182
[22]Ramezanzadeha B,Niroumandrad S,Ahmadi A,et al.Enhancement of barrier and corrosion protection performance of an epoxy coating through wet transfer of amino functionalized graphene oxide[J].Corros.Sci.,2016,103:283
[23]Hirschorn B,Orazem M E,Tribollet B,et al.Determination of effective capacitance and film thickness from constant-phase-element parameters[J].Electrochim.Acta,2010,55:6218
[24]Stafford O A,Hinderliter B R,Croll S G.Electrochemical impedance spectroscopy response of water uptake in organic coatings by finite element methods[J].Electrochim.Acta,2006,52:1339
[25]Behzadnasab M,Mirabedini S M,Kabiri K,et al.Corrosion performance of epoxy coatings containing silane treated Zr O2nanoparticles on mild steel in 3.5%Na Cl solution[J].Corros.Sci.,2011,53:89
[26]Battocchi D,Sim?es A M,Tallman D E,et al.Electrochemical behaviour of a Mg-rich primer in the protection of Al alloys[J].Corros.Sci.,2006,48:1292
[27]Funke W.Problems and progress in organic coatings science and technology[J].Prog.Org.Coat.,1997,31:5