两种低合金钢在深海环境下腐蚀行为规律研究
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摘要
目的研究两种低合金钢材料在不同深度海水环境下的腐蚀行为规律。方法通过深海实海试验,研究10CrNi3MoV与E47两种船用低合金钢在1200、2000、3000 m深度海水环境下暴露0.5、2 a的腐蚀行为规律。借助于三维视频显微镜和XRD等技术,分别进行腐蚀形貌观察与腐蚀产物成分分析,结合腐蚀动力学数据,对比研究两者深海环境耐蚀性能的优劣。结果不同深度环境下,腐蚀产物分内外两层,锈层下表面形态相对平整,存在大量细小点蚀坑。随深度的增加,点蚀坑数量呈增加趋势。腐蚀初期,2000m腐蚀速率和点蚀深度最低,随暴露时间的推移,锈层中α-FeOOH的含量明显提升,腐蚀速率均呈下降趋势。结论10CrNi3MoV深海耐蚀性劣于E47,初期2000 m深海腐蚀性略差,深度增加有利于两者点蚀形核过程。随着时间的推移,锈层对基体具有一定的保护作用,点蚀纵深发展阻力增大。
Objective To investigate corrosion behaviors and rules of two kinds of low alloy steels in deep-sea environments.Methods Through the deep-sea field exposure test, corrosion behaviors of 10 CrNi3 MoV and E47 low alloy steels exposed for0.5 a and 2 a at 1200 m, 2000 m and 3000 m depth of the sea were studied. With the help of 3 D video microscope and XRD technology, the corrosion morphology observation and corrosion product composition analysis were done, and the corrosion kinetic data were also used to compare their corrosion resistance performance. Results The corrosion products had a two-layer sructure, and the surface under the rust layers was relatively flat, distributed with a lot of small pits. With the increase of depth,the number of pits increased. In the initial stage of corrosion, the corrosion rate and pitting depths were the lowest at 2000 m.With the exposure time went on, the content of α-FeOOH in the rust layer increased obviously, while the corrosion rate showed a decreasing trend. Conclusion The deep-sea corrosion resistance of 10 CrNi3 MoV is inferior to that of E47. In the early stage,deep-sea corrosion at 2000 m is slight for both, while the sea depth increase contributes to the pitting nucleation process. Over time, the rust layer has a certain protective effect on the substrate, and the resisitance of pitting growth to depth direction increases.
Objective To investigate corrosion behaviors and rules of two kinds of low alloy steels in deep-sea environments.Methods Through the deep-sea field exposure test, corrosion behaviors of 10 CrNi3 MoV and E47 low alloy steels exposed for0.5 a and 2 a at 1200 m, 2000 m and 3000 m depth of the sea were studied. With the help of 3 D video microscope and XRD technology, the corrosion morphology observation and corrosion product composition analysis were done, and the corrosion kinetic data were also used to compare their corrosion resistance performance. Results The corrosion products had a two-layer sructure, and the surface under the rust layers was relatively flat, distributed with a lot of small pits. With the increase of depth,the number of pits increased. In the initial stage of corrosion, the corrosion rate and pitting depths were the lowest at 2000 m.With the exposure time went on, the content of α-FeOOH in the rust layer increased obviously, while the corrosion rate showed a decreasing trend. Conclusion The deep-sea corrosion resistance of 10 CrNi3 MoV is inferior to that of E47. In the early stage,deep-sea corrosion at 2000 m is slight for both, while the sea depth increase contributes to the pitting nucleation process. Over time, the rust layer has a certain protective effect on the substrate, and the resisitance of pitting growth to depth direction increases.
引文
[1]孙海静,刘莉,李瑛.深海静水压力环境下低合金高强度钢腐蚀行为研究[J].电化学,2013,19(5):418-424.
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[16]VENKATESAN R,VENKATASAMY M A,BHASK-ARAN T A,et al.Corrosion of Ferrous Alloys in Deep Sea Environments[J].British Corrosion Journal,2002,37(4):257-266.
[17]DING K,GUO W,QIU R,et al.Corrosion Behavior of Q235 Steel Exposed in Deepwater of South China Sea[J].Journal of Materials Engineering and Performance,2018,27(9):4489-4496.
[18]KLOTZ I M.Introduction to Chemical Thermodynamics[M].NewYork:W A Benjamin Inc,1964.
[2]YANG Y,ZHANG T,SHAO Y,et al.Effect of Hydrostatic Pressure on the Corrosion Behaviour of Ni-Cr-Mo-VHigh Strength Steel[J].Corrosion Science,2010,52(8):2697-2706.
[3]郭为民,李文军,陈光章.材料深海环境腐蚀试验[J].装备环境工程,2006,3(1):10-15.
[4]周建龙,李晓刚,程学群,等.深海环境下金属及合金材料腐蚀研究进展[J].腐蚀科学与防护技术,2010,22(1):47-51.
[5]TRAVERSO P,CANEPA E.A Review of Studies on Corrosion of Metals and Alloys in Deep-sea Environment[J].Ocean Engineering,2014,87:10-15.
[6]SHIFLER D A.Understanding Material Interactions in Marine Environments to Promote Extended Structural Life[J].Corrosion Science,2005,47(10):2335-2352.
[7]包木太,皮永蕊,孙培艳,等.墨西哥湾“深水地平线”溢油事故处理研究进展[J].中国海洋大学学报(自然科学版),2015,45(1):55-62.
[8]SCHUMACHER M.Seawater Corrosion Handbook[M].Park Ridge:Noyes Data Corporation,1979.
[9]DEXTER S C.Handbook of Oceanographic Engineering Materials[M].New York:Wiley InterScience,1979.
[10]DEXTER S C.Effect of Variations in Sea Water upon the Corrosion of Aluminum[J].Corrosion,1980,36(8):423-432.
[11]SPARKS C P,CABILLIC J P,SCHAWANN J C.Longitudinal Resonant Behavior of Very Deep Water Risers[J].Journal of Energy Resources Technology,1983,105(3):282-289.
[12]LAQUE F L.Marine Corrosion[M].London:John Wiley&Sons Inc,1975.
[13]CHADLER K A.Marine and Offshore Corrosion(Marine Engineering Series)[M].London:Butter Worth,1985.
[14]WARREN B A.The Deep Water of the Central Indian Basin[J].Journal of Marine Research,1982,40(s1):823-859.
[15]SAWANT S S,VENKAT K,WAGH A B.Corrosion of Metals and Alloys in the Coastal and Deep Waters of the Arabian Sea and the Bay of Bengal[J].Indian Journal of Technology,1993,31(12):862-866.
[16]VENKATESAN R,VENKATASAMY M A,BHASK-ARAN T A,et al.Corrosion of Ferrous Alloys in Deep Sea Environments[J].British Corrosion Journal,2002,37(4):257-266.
[17]DING K,GUO W,QIU R,et al.Corrosion Behavior of Q235 Steel Exposed in Deepwater of South China Sea[J].Journal of Materials Engineering and Performance,2018,27(9):4489-4496.
[18]KLOTZ I M.Introduction to Chemical Thermodynamics[M].NewYork:W A Benjamin Inc,1964.