直升机结构钢涂层体系防护性能在模拟海洋大气环境中的变化
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摘要
目的对比、评价服役于海洋大气环境中直升机结构钢防护体系的防护性能。方法通过模拟海洋大气环境加速试验方法,研究直升机结构钢防护体系在实际服役过程中出现的损伤。结果涂层A微观结构较为疏松,加速试验中涂层基体产生鼓泡,并发生腐蚀。电化学阻抗谱(EIS)方法测得低频区的阻抗模值相对较低,说明涂层防护性能较差,与宏观试验结果一致。结论在模拟海洋大气环境的加速试验中,涂层表面的微小缺陷(如疏松结构中的微小孔洞)会成为腐蚀溶液进入的快速通道,进而降低涂层的防护性能。利用电化学阻抗谱(EIS)方法可有效表征有机涂层涂覆下的金属腐蚀行为,并评估涂层的防护性能。
Objective To compare and evaluate the protective properties of coatings on structural steel used on helicopter that serves in ocean atmospheric environment. Methods The damage in the protective system of structural steel used on helicopter in service was researched via accelerated testing method of simulating the ocean atmospheric environment. Results Blistering and rusting occurred in the sample of coating A after accelerated testing because of the loose structure of coating A. The|Z| f=0.1 Hz measured by the EIS was low so that the protective properties was poor, which was in accordance with the macroscopic observation. Conclusion During the accelerated testing of simulating the ocean atmospheric environment, the small detect in the coatings(such as the porous structure) would become erosion solution entering the fast channel and reducing the protective properties. Corrosion behavior of metal coated by organic coatings can be effectively characterized and the performance of the coating can be accessed by the EIS method.
Objective To compare and evaluate the protective properties of coatings on structural steel used on helicopter that serves in ocean atmospheric environment. Methods The damage in the protective system of structural steel used on helicopter in service was researched via accelerated testing method of simulating the ocean atmospheric environment. Results Blistering and rusting occurred in the sample of coating A after accelerated testing because of the loose structure of coating A. The|Z| f=0.1 Hz measured by the EIS was low so that the protective properties was poor, which was in accordance with the macroscopic observation. Conclusion During the accelerated testing of simulating the ocean atmospheric environment, the small detect in the coatings(such as the porous structure) would become erosion solution entering the fast channel and reducing the protective properties. Corrosion behavior of metal coated by organic coatings can be effectively characterized and the performance of the coating can be accessed by the EIS method.
引文
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[15]陈朝轶,杨京,李军旗,等.模拟海洋大气环境下Cl-质量分数对3003铝合金腐蚀行为的影响[J].表面技术,2015,44(3):116-121.
[16]李晓琳,淡婷,邓丽芬,等.1Cr18Ni9Ti不锈钢球头表面腐蚀原因分析[J].失效分析与预防,2014,9(5):271-274.
[2]张栋.飞机结构件在当量环境谱下加速腐蚀试验和日历寿命估算方法[J].航空学报,2000,21(3):196-201.
[3]李世平,魏广平.飞机涂层老化模式及日历寿命预测[J].环境技术,2017,35(1):24-26.
[4]MILLS G,ELIASSON J.Factors Influencing Early Crack Development in Marine Cargo and Ballast Tank Coatings[J].Journal of Protective Coatings and Linings,2006,23(2):10-21.
[5]AMIMDIN A,BARREAU C,HELLOUIN R,et a1.Evaluation of Anti-corrosive Pigments by Pigment Extract Studies,Atmospheric Exposure and Electrochemical Impedance Spectroscopy[J].Progress in Organic Coatings,1995,25(4):339-355.
[6]CAO C N.Principles of Electrochemistry of Corrosion[M].Peking:Chem Ind Press,2008.
[7]LIU Y,WANG J W,LIU L,et a1.Study of the Failure Mechanism of an Epoxy Coating System Under Hish Hydrostatic Pressure[J].Corrosion Science,2013,74(3):59-70.
[8]LONG A K,ROSENTHAL R R.Causes and Prevention of Coating Failures[J].Materials Protection,1970,9(3):32-36.
[9]张勇,丁文勇,陈跃良,等.有机涂层户外曝晒与加速试验对比研究[J].装备环境工程,2013,10(2):14-17.
[10]余存烨.涂层钢腐蚀破坏的原因与防护[J].全面腐蚀控制,2014(1):32-40.
[11]ZHANG J T,HU J M,ZHANG J Q,et a1.Studies of Impedance Models and Water Transport Behaviors of Polypropylene Coated Metals in NaCl Solution[J].Progress in Organic Coatings,2004,49(4):293-301.
[12]LEE S S.Analysis of Interface Crack in Polymer Liner Subjected to Hygrothermal Stress[J].Key Engineering Materials,2006,324/325:1249-1252.
[13]BERGO A,FEDRIZZI L.Thermal Aging of Painted Galvanized Steel after Mechanical Deformation[J]Progress in Organic Coatings,2005,52(4):328-338.
[14]LIU Xu-wen,XIONG Jin-ping,CAO Jing-yi,et al.Electrochemical Corrosion Behavior of Three Coating Systems by EIS[J].Journal of Chemical Industry and Engineering,2008,59(3):659-664.
[15]陈朝轶,杨京,李军旗,等.模拟海洋大气环境下Cl-质量分数对3003铝合金腐蚀行为的影响[J].表面技术,2015,44(3):116-121.
[16]李晓琳,淡婷,邓丽芬,等.1Cr18Ni9Ti不锈钢球头表面腐蚀原因分析[J].失效分析与预防,2014,9(5):271-274.