盐雾试验对电子设备机箱涂层的影响(英文)
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摘要
飞机服役于沿海环境中,各部位极易受到盐雾等腐蚀性气氛的影响。通过盐雾试验对机载电子设备机箱涂层进行耐蚀性检测,利用扫面电镜、电化学工作站,红外光谱等方法对涂层进行分析,研究其在盐雾条件下的失效机理及退化规律。结果表明:涂层在盐雾环境下的失效主要是由于物理过程,而非化学老化导致,且涂层失效过程主要包含3个进程,用交流阻抗谱对其整个腐蚀过程可以精确地表征。
Aircraft materials and products can be corroded by the salt fog environment in ocean areas.In this paper,the performance of the composite coating on the avionics cases was examined by salt fog test.Coating's failure mechanisms were analyzed according to the electrochemical method and infrared analysis.The result shows that physical factor is the main reason for the coating failure.The micro-holes and defects are the sources that pitting corrosion occurs on the metal.What is more,integrity is affected by the micro defect.The main reason for the coating failure is that those electrolytes penetrate into the coating through micro-holes and defects,finally reach to the metal substrate and cause corrosion on the metal.The whole corrosion process can be characterized accurately by EIS(Electrochemical Impedance Spectroscopy).
Aircraft materials and products can be corroded by the salt fog environment in ocean areas.In this paper,the performance of the composite coating on the avionics cases was examined by salt fog test.Coating's failure mechanisms were analyzed according to the electrochemical method and infrared analysis.The result shows that physical factor is the main reason for the coating failure.The micro-holes and defects are the sources that pitting corrosion occurs on the metal.What is more,integrity is affected by the micro defect.The main reason for the coating failure is that those electrolytes penetrate into the coating through micro-holes and defects,finally reach to the metal substrate and cause corrosion on the metal.The whole corrosion process can be characterized accurately by EIS(Electrochemical Impedance Spectroscopy).
引文
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[2]Song Enpeng,Liu Wenting,Yang Xu.Study on accelerated corrosion test environment spectrum for internal aircraft structure[J].Acta Aeronautica et Astronautica Sinica,2006,27(4):643-649.
[3]Ranjbar,Z,Moradian S,Attar M R M Z.EIS investigation of cataphoretically electrodeposited epoxy coatings having different EEWs[J].Progress in organic coatings,2004,51(2):87-90.
[4]Le Pen C,Lacabanne C,Pébère N.Characterisation of water-based coatings by electrochemical impedance spectroscopy[J].Progress in organic coatings,2003,46(2):77-83.
[5]Luo Zhenhua,Yao Pei,Cai Jianping,et al.Progress ofevaluation techniques for organic coatings performance[J].Corrosion Science and Protection Technology,2004,16(5):314-317.
[6]Hinderliter B R,Croll S G,Tallman D E,et al.Interpretation of EIS data from accelerated exposure of coated metals based on modeling of coating physical properties[J].Elctrochimica Acta,2006,51(21):4505-4515.
[7]Zhang Jintao,Hu Jiming,Zhang Jianqing,et al.A review on modern method of organic coatings[J].Journal of Materials Science and Engineering,2003,21(5):763-768.
[8]Darowicki K,Slepski P,Szocinski M.Application of the dynamic EIS to investigation of transport within organic coatings[J].Progress in Organic Coatings,2005,52(4):306-310.
[9]Bierwagen G,Tallman D,He J P,et al.EIS studies of coated metals in accelerated exposure[J].Progress in Organic Coatings,2003,46(2):148-157.
[10]Sharer Z,Sykes J.Insights into protection mechanisms of organic coatings from thermal testing with EIS[J].Progress in Organic Coatings,2012,74(2):405-409.
[11]Fredj N,Cohendoz S,Feaugas X,er al.Ageing of marine coating in natural and artificial seawater under mechanical stresses[J].Progress in Organic Coatings,2012,74(2):391-399.
[12]ZHANG W,WANG J,LI Y N,et al.Evaluation of metal corrosion under defective coatings by WBE and EIS technique[J].Acta Physico-Chimica Sinica,2010,26(11):2941-2950.
[13]Zuo S,Yao C,Liu W,et al.Porous palygorskite-polythiophene conductive composites for acrylic coatings[J].Journal of Applied Polymer Science,2013,129(5):2707-2715.
[14]MIL-STD-810 Committee.Environmental Test Methods and Engineering Guides[S].MIL-STD-810F,2000.
[2]Song Enpeng,Liu Wenting,Yang Xu.Study on accelerated corrosion test environment spectrum for internal aircraft structure[J].Acta Aeronautica et Astronautica Sinica,2006,27(4):643-649.
[3]Ranjbar,Z,Moradian S,Attar M R M Z.EIS investigation of cataphoretically electrodeposited epoxy coatings having different EEWs[J].Progress in organic coatings,2004,51(2):87-90.
[4]Le Pen C,Lacabanne C,Pébère N.Characterisation of water-based coatings by electrochemical impedance spectroscopy[J].Progress in organic coatings,2003,46(2):77-83.
[5]Luo Zhenhua,Yao Pei,Cai Jianping,et al.Progress ofevaluation techniques for organic coatings performance[J].Corrosion Science and Protection Technology,2004,16(5):314-317.
[6]Hinderliter B R,Croll S G,Tallman D E,et al.Interpretation of EIS data from accelerated exposure of coated metals based on modeling of coating physical properties[J].Elctrochimica Acta,2006,51(21):4505-4515.
[7]Zhang Jintao,Hu Jiming,Zhang Jianqing,et al.A review on modern method of organic coatings[J].Journal of Materials Science and Engineering,2003,21(5):763-768.
[8]Darowicki K,Slepski P,Szocinski M.Application of the dynamic EIS to investigation of transport within organic coatings[J].Progress in Organic Coatings,2005,52(4):306-310.
[9]Bierwagen G,Tallman D,He J P,et al.EIS studies of coated metals in accelerated exposure[J].Progress in Organic Coatings,2003,46(2):148-157.
[10]Sharer Z,Sykes J.Insights into protection mechanisms of organic coatings from thermal testing with EIS[J].Progress in Organic Coatings,2012,74(2):405-409.
[11]Fredj N,Cohendoz S,Feaugas X,er al.Ageing of marine coating in natural and artificial seawater under mechanical stresses[J].Progress in Organic Coatings,2012,74(2):391-399.
[12]ZHANG W,WANG J,LI Y N,et al.Evaluation of metal corrosion under defective coatings by WBE and EIS technique[J].Acta Physico-Chimica Sinica,2010,26(11):2941-2950.
[13]Zuo S,Yao C,Liu W,et al.Porous palygorskite-polythiophene conductive composites for acrylic coatings[J].Journal of Applied Polymer Science,2013,129(5):2707-2715.
[14]MIL-STD-810 Committee.Environmental Test Methods and Engineering Guides[S].MIL-STD-810F,2000.