Q345钢预热时间对熔结环氧粉末涂层防护性能的影响Ⅰ:界面结合性能分析
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摘要
通过拉伸实验和湿附着力评级实验,研究了210℃下基体的预热时间对熔结环氧粉末涂层/Q345钢界面结合性能的影响。结果表明,预热时间对涂层体系结合性能影响显著,Q345基体在210℃下预热6 h其结合性能达到最佳。采用CLSM、AFM和XPS等表面测试技术分别对基体表面形貌、粗糙度和化学成分进行表征,并探讨基体表面状态与涂层体系结合性能的相关性。结果表明,预热处理使得Q345基体表面生成致密氧化膜,氧化膜成分由外到内依次为Fe_2O_3层和Fe_3O_4层。随着预热时间延长,表层Fe_2O_3厚度基本不变,内层Fe_3O_4逐渐增厚,基体表面粗糙度改变;基体表面粗糙度的改变影响涂层体系结合性能。
The effect of substrate preheating time on the interface bonding of fusion bonded epoxy powder coating/Q345 substrate was investigated by means of tensile test and wet adhesion test. Results showed that the preheating time presents significant effect on the interface bonding of coating/Q345 substrate, and among others, the best bonding performance could be acquired for the substrate being preheated for 6 h at 210 ℃. The surface morphology, roughness and chemical composition of the substrate were characterized by CLSM, AFM, XPS, and the correlation between the surface state of the substrate and the bonding performance of coating/substrate was inquired into. Results revealed that the preheating treatment resulted in the formation of a dense oxide scale on the surface of Q345 substrate, which composed of an outer layer Fe_2O_3 and an inner layer Fe_3O_4. With the prolonging preheating time, the thickness of Fe_2O_3 layer was almost the same and the inner layer Fe_3O_4 became thicker, whilst the surface roughness of the substrate changed gradually. The change of the surface roughness of the substrate affected the bonding performance of the coating/substrate system.
The effect of substrate preheating time on the interface bonding of fusion bonded epoxy powder coating/Q345 substrate was investigated by means of tensile test and wet adhesion test. Results showed that the preheating time presents significant effect on the interface bonding of coating/Q345 substrate, and among others, the best bonding performance could be acquired for the substrate being preheated for 6 h at 210 ℃. The surface morphology, roughness and chemical composition of the substrate were characterized by CLSM, AFM, XPS, and the correlation between the surface state of the substrate and the bonding performance of coating/substrate was inquired into. Results revealed that the preheating treatment resulted in the formation of a dense oxide scale on the surface of Q345 substrate, which composed of an outer layer Fe_2O_3 and an inner layer Fe_3O_4. With the prolonging preheating time, the thickness of Fe_2O_3 layer was almost the same and the inner layer Fe_3O_4 became thicker, whilst the surface roughness of the substrate changed gradually. The change of the surface roughness of the substrate affected the bonding performance of the coating/substrate system.
引文
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[5]Elsner C I,Cavalcanti E,Ferraz O,et al.Evaluation of the surface treatment effect on the anticorrosive performance of paint systems on steel[J].Prog.Org.Coat.,2003,48:50
[6]Wang Z P,Xie Z,Li L,et al.The influence of steel surface treatment process on epoxy resin coating adhesion[J].Total Corros.Control,2013,27(11):60(王志鹏,谢众,李龙等.钢材表面处理工艺对环氧涂层附着力的影响[J].全面腐蚀控制,2013,27(11):60)
[7]Jamali S S,Mills D J.Steel surface preparation prior to painting and its impact on protective performance of organic coating[J].Prog.Org.Coat.,2014,77:2091
[8]Cho K,Cho E C.Effect of the microstructure of copper oxide on the adhesion behavior of epoxy/copper leadframe joints[J].J.Adhes.Sci.Technol.,2000,14:1333
[9]Li W C,Zhang M M,Qiao J F,et al.Preparation and properties of phosphating and silane films on cold rolled steel[J].Corros.Prot.,2015,36:334(李文超,张明明,乔静飞等.冷轧钢表面磷化膜和硅烷膜的制备与性能[J].腐蚀与防护,2015,36:334)
[10]Vakili H,Ramezanzadeh B,Amini R.The corrosion performance and adhesion properties of the epoxy coating applied on the steel substrates treated by cerium-based conversion coatings[J].Corros.Sci.,2015,94:466
[11]Liu B,Fang Z G,Wang H B,et al.Effect of cross linking degree and adhesion force on the anti-corrosion performance of epoxy coatings under simulated deep sea environment[J].Prog.Org.Coat.,2013,76:1814
[12]S?rensen P A,Kiil S,Dam-Johansen K,et al.Anticorrosive coatings:a review[J].J.Coat.Technol.Res.,2009,6:135
[13]NIST XPS database.http://srdata.nist.gov/xps/
[14]Mi W B,Jiang E Y,Bai H L.Fe3+/Fe2+ratio controlled magnetic and electrical transport properties of polycrystalline Fe3(1-δ)O4films[J].J.Phys.:Appl.Phys.,2009,42D:105007
[15]Fujii T,De Groot F M F,Sawatzky G A,et al.In situ XPS analysis of various iron oxide films grown by NO2-assisted molecularbeam epitaxy[J].Phys.Rev.,1999,59B:3195
[16]Aronniemi M,Sainio J,Lahtinen J.Chemical state quantification of iron and chromium oxides using XPS:The effect of the background subtraction method[J].Surf.Sci.,2005,578:108
[17]Wielant J,Goossens V,Hausbrand R,et al.Electronic properties of thermally formed thin iron oxide films[J].Electrochim.Acta,2007,52:7617
[18]Li M S.High Temperature Corrosion of Metals[M].Bejing:Metallurgical Industry Press,2001:111(李美栓.金属的高温腐蚀[M].北京:冶金工业出版社,2001:111)
[19]Bertrand N,Desgranges C,Poquillon D,et al.Iron oxidation at low temperature(260~500℃)in air and the effect of water vapor[J].Oxid.Met.,2010,73(1/2):139
[20]Bahlakeh G,Ghaffari M,Saeb M R,et al.A close-up of the effect of iron oxide type on the interfacial interaction between epoxy and carbon steel:Combined molecular dynamics simulations and quantum mechanics[J].Phys.Chem.,2016,120C:11014