海洋柔性立管用高强钢的高温海水腐蚀行为
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摘要
通过开展浸泡腐蚀实验和电化学腐蚀实验研究了海洋柔性立管用高强钢在高温海水环境中的腐蚀行为。通过分析实验钢的腐蚀速率、腐蚀产物物相组成、腐蚀产物形态特征以及不同腐蚀时间后实验钢动电位极化曲线,揭示了实验钢的高温海水腐蚀行为与机制。结果表明:随着腐蚀时间的延长,腐蚀速率先是快速下降随后缓慢下降并趋于稳定,稳定状态的腐蚀速率为0.071 mm/a。而基体表面附着的腐蚀产物的致密度则是随时间的延长不断增加,抑制了腐蚀过程中的电化学反应。钢中耐蚀元素Cr、Mo、Ni的添加不仅可以促进形成致密稳定的腐蚀产物层,还可提高基体的自腐蚀电位,降低自腐蚀电流,增强实验钢的耐蚀性。
The corrosion behavior of high strength steel for marine flexible pipe in high temperature seawater environment was studied by immersion and electrochemical corrosion experiments. The corrosion behavior and mechanism of the tested steel at high temperature were revealed by analyzing corrosion rate, phase composition of corrosion products, morphological characteristics of corrosion products and potentiodynamic polarization curves of experimental steels after different corrosion time. The results show that with the prolongation of corrosion time, the corrosion rate decreases rapidly and then decreases slowly and tends to stabilize, and the stable corrosion rate is 0.071 mm/a. However, the densities of the corrosion products attached to the substrate are increasing with the increase of corrosion time, which inhibits the electrochemical reaction in the corrosion process. The addition of corrosion resistant element Cr, Mo and Ni can not only promote the formation of dense and stable corrosion product layer, but also increase the corrosion potential of the substrate, reduce the corrosion current and enhance the corrosion resistance of the tested steel.
The corrosion behavior of high strength steel for marine flexible pipe in high temperature seawater environment was studied by immersion and electrochemical corrosion experiments. The corrosion behavior and mechanism of the tested steel at high temperature were revealed by analyzing corrosion rate, phase composition of corrosion products, morphological characteristics of corrosion products and potentiodynamic polarization curves of experimental steels after different corrosion time. The results show that with the prolongation of corrosion time, the corrosion rate decreases rapidly and then decreases slowly and tends to stabilize, and the stable corrosion rate is 0.071 mm/a. However, the densities of the corrosion products attached to the substrate are increasing with the increase of corrosion time, which inhibits the electrochemical reaction in the corrosion process. The addition of corrosion resistant element Cr, Mo and Ni can not only promote the formation of dense and stable corrosion product layer, but also increase the corrosion potential of the substrate, reduce the corrosion current and enhance the corrosion resistance of the tested steel.
引文
[1] 余荣华,袁鹏斌.海洋非粘结型柔性软管的性能结构及其研究热点[J].油气储运,2016,35(12):1255-1260.YU Rong-hua,YUAN Peng-bin.Structure and research focus of marine unbonded flexible pipes[J].Oil and Gas Storage and Transportation,2016,35(12):1255-1260.
[2] Liu Z G,Gao X H,Du L X,et al.Comparison of corrosion behaviour of low-alloy pipeline steel exposed to H2S/CO2-saturated brine and vapour-saturated H2S/CO2 environments[J].Electrochimica Acta,2017,232:528-541.
[3] Zhang M M,Chen X Q,Fu S X,et al.Theoretical and numerical analysis of bending behavior of unbonded flexible risers[J].Marine Structures,2015,44:311-325.
[4] Stergaard N H,Lyckegaard A,Andreasen J H.On modelling of lateral buckling failure in flexible pipe tensile armour layers[J].Marine Structures,2012,27:64-81.
[5] Ruan W D,Bai Y,Yuan S.Dynamic analysis of unbonded flexible pipe with bend stiffener constraint and bending hysteretic behavior[J].Ocean Engineering,2017,130:583-596.
[6] Zhang D Z,Gao X H,Su G Q,et al.Effect of tempered martensite and ferrite/bainite on corrosion behavior of low alloy steel used for flexible pipe exposed to high-temperature brine environment[J].Journal of Materials Engineering and Performance,2018,27:4911-4920.
[7] Taravel-Condat C,Desamais N.Qualification of high strength carbon steel wires for use in specific annulus environment of flexible pipes containing CO2 and H2S[C]//25th International Conference on Offshore Mechanics and Arctic Engineering,Hamburg,Germany,June 4-9,2006:1-7.
[8] 翁镭,吴红艳,杜林秀.高钛耐候钢在模拟海洋气候下的腐蚀行为[J].材料热处理学报,2018,39(5):94-99.WENG Lei,WU Hong-yan,DU Lin-xiu.Corrosion behavior of high-Ti weathering resistant steel in simulated marine climate[J].Transactions of Materials and Heat Treatment,2018,39(5):94-99.
[9] Kamimura T,Hara S,Miyuki H,et al.Composition and protective ability of rust layer formed on weathering steel exposed to various environments[J].Corrosion Science,2006,48:2799-2812.
[10] Qian Y H,Ma C H,Niu D,et al.Influence of alloyed chromium on the atmospheric corrosion resistance of weathering steels[J].Corrosion Science,2013,74:424-429.
[11] 晁月林,周玉丽,邸全康,等.Cu,P,Cr和Ni对低碳钢耐蚀性的影响[J].中国腐蚀与防护学报,2014,34(1):70-74.CHAO Yue-lin,ZHOU Yu-li,DI Quan-kang,et al.Effect of micro-alloying elements on corrosion resistance of low carbon steels[J].Journal of Chinese Society for Corrosion and Protection,2014,34(1):70-74.
[12] Gao M,Pang X,Gao K.The growth mechanism of CO2 corrosion product films[J].Corrosion Science,2011,53:557-568.
[13] Han W,Pan C,Wang Z Y,et al.A study on the initial corrosion behavior of carbon steel exposed to outdoor wet-dry cyclic condition[J].Corrosion Science,2014,88:89-100.
[14] Zhang D Z,Gao X H,Su G Q,et al.Corrosion behavior of low-C medium-Mn steel in simulated marine immersion and splash zone environment[J].Journal of Materials Engineering and Performance,2017,26(6):2599-2607.
[15] 郑莹莹,邹妍,王佳.海洋环境中锈层下碳钢腐蚀行为的研究进展[J].腐蚀科学与防护技术,2011,23(1):93-98.ZHENG Ying-ying,ZOU Yan,WANG Jia.Research progress on corrosion of carbon steels under rust layer in marine environment[J].Corrosion Science and Protection Technology,2011,23(1):93-98.
[16] Song D,Sun W,Jiang J Y,et al.Corrosion behavior of Cr micro-alloyed corrosion-resistant rebar in neutral Cl--containing environment[J].Journal of Iron and Steel Research International,2016,23(6):608-617.
[2] Liu Z G,Gao X H,Du L X,et al.Comparison of corrosion behaviour of low-alloy pipeline steel exposed to H2S/CO2-saturated brine and vapour-saturated H2S/CO2 environments[J].Electrochimica Acta,2017,232:528-541.
[3] Zhang M M,Chen X Q,Fu S X,et al.Theoretical and numerical analysis of bending behavior of unbonded flexible risers[J].Marine Structures,2015,44:311-325.
[4] Stergaard N H,Lyckegaard A,Andreasen J H.On modelling of lateral buckling failure in flexible pipe tensile armour layers[J].Marine Structures,2012,27:64-81.
[5] Ruan W D,Bai Y,Yuan S.Dynamic analysis of unbonded flexible pipe with bend stiffener constraint and bending hysteretic behavior[J].Ocean Engineering,2017,130:583-596.
[6] Zhang D Z,Gao X H,Su G Q,et al.Effect of tempered martensite and ferrite/bainite on corrosion behavior of low alloy steel used for flexible pipe exposed to high-temperature brine environment[J].Journal of Materials Engineering and Performance,2018,27:4911-4920.
[7] Taravel-Condat C,Desamais N.Qualification of high strength carbon steel wires for use in specific annulus environment of flexible pipes containing CO2 and H2S[C]//25th International Conference on Offshore Mechanics and Arctic Engineering,Hamburg,Germany,June 4-9,2006:1-7.
[8] 翁镭,吴红艳,杜林秀.高钛耐候钢在模拟海洋气候下的腐蚀行为[J].材料热处理学报,2018,39(5):94-99.WENG Lei,WU Hong-yan,DU Lin-xiu.Corrosion behavior of high-Ti weathering resistant steel in simulated marine climate[J].Transactions of Materials and Heat Treatment,2018,39(5):94-99.
[9] Kamimura T,Hara S,Miyuki H,et al.Composition and protective ability of rust layer formed on weathering steel exposed to various environments[J].Corrosion Science,2006,48:2799-2812.
[10] Qian Y H,Ma C H,Niu D,et al.Influence of alloyed chromium on the atmospheric corrosion resistance of weathering steels[J].Corrosion Science,2013,74:424-429.
[11] 晁月林,周玉丽,邸全康,等.Cu,P,Cr和Ni对低碳钢耐蚀性的影响[J].中国腐蚀与防护学报,2014,34(1):70-74.CHAO Yue-lin,ZHOU Yu-li,DI Quan-kang,et al.Effect of micro-alloying elements on corrosion resistance of low carbon steels[J].Journal of Chinese Society for Corrosion and Protection,2014,34(1):70-74.
[12] Gao M,Pang X,Gao K.The growth mechanism of CO2 corrosion product films[J].Corrosion Science,2011,53:557-568.
[13] Han W,Pan C,Wang Z Y,et al.A study on the initial corrosion behavior of carbon steel exposed to outdoor wet-dry cyclic condition[J].Corrosion Science,2014,88:89-100.
[14] Zhang D Z,Gao X H,Su G Q,et al.Corrosion behavior of low-C medium-Mn steel in simulated marine immersion and splash zone environment[J].Journal of Materials Engineering and Performance,2017,26(6):2599-2607.
[15] 郑莹莹,邹妍,王佳.海洋环境中锈层下碳钢腐蚀行为的研究进展[J].腐蚀科学与防护技术,2011,23(1):93-98.ZHENG Ying-ying,ZOU Yan,WANG Jia.Research progress on corrosion of carbon steels under rust layer in marine environment[J].Corrosion Science and Protection Technology,2011,23(1):93-98.
[16] Song D,Sun W,Jiang J Y,et al.Corrosion behavior of Cr micro-alloyed corrosion-resistant rebar in neutral Cl--containing environment[J].Journal of Iron and Steel Research International,2016,23(6):608-617.