海水流速对X80管线钢极化曲线的影响
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摘要
为了研究海水流速对海底管线钢极化曲线和阴极保护的影响规律,以更有效地控制海底管道腐蚀,利用旋转圆柱电极实验装置模拟得到海水流速为0~3.5 m/s时管线钢的极化曲线,通过分析自腐蚀电位和腐蚀电流密度的变化评价X80管线钢腐蚀状况。利用得到的极化曲线作为边界条件,应用有限元数值模拟方法引入防腐层击穿系数ξ,分别研究海底管道在裸钢(ξ=1)、涂层破损严重(ξ=0.1)、涂层破损较轻(ξ=0.01)时表面电位、阳极反应电流密度、阴极反应电流密度的分布情况。研究结果表明,在X80管线钢三种不同的表面状态下,海水流速对阴极保护的影响规律有很大差别,该结果可为海底管道现场腐蚀防护提供工业指导。
In order to study the influence rule of seawater flow rate on the polarization curve of submarine pipeline steel and cathodic protection and to effectively control the corrosion of submarine pipelines,when the seawater flow rate is 3 to 3.5 m/s the polarization curve of the pipeline steel is simulated and get through the rotary cylinder electrode experiment device,and the X80 pipeline steel corrosion status is evaluated by analyzing the change of self corrosion potential and corrosion current density.Then,using the obtained polarization curve as the boundary condition,and with the finite element numerical simulation method and the introduction of the anticorrosive coating breakdown coefficientξ,the distribution of surface potential,anode reaction current density and cathode reaction current density when the steel is naked(ξ =1),the coating is damaged seriously(ξ =0.1) and the coating is damaged slightly(ξ =0.01) are studied respectively.The research results show that the influence rule of the flow rate on the cathodic protection is quite different when X80 pipeline steel is in three different surface conditions.The results can provide industrial guidance for field corrosion protection of submarine pipelines.
In order to study the influence rule of seawater flow rate on the polarization curve of submarine pipeline steel and cathodic protection and to effectively control the corrosion of submarine pipelines,when the seawater flow rate is 3 to 3.5 m/s the polarization curve of the pipeline steel is simulated and get through the rotary cylinder electrode experiment device,and the X80 pipeline steel corrosion status is evaluated by analyzing the change of self corrosion potential and corrosion current density.Then,using the obtained polarization curve as the boundary condition,and with the finite element numerical simulation method and the introduction of the anticorrosive coating breakdown coefficientξ,the distribution of surface potential,anode reaction current density and cathode reaction current density when the steel is naked(ξ =1),the coating is damaged seriously(ξ =0.1) and the coating is damaged slightly(ξ =0.01) are studied respectively.The research results show that the influence rule of the flow rate on the cathodic protection is quite different when X80 pipeline steel is in three different surface conditions.The results can provide industrial guidance for field corrosion protection of submarine pipelines.
引文
[1]任胜彬.流速对X系列管线钢极化曲线及其阴极保护的影响[D].大连:大连理工大学,2015.
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[2]韩文海.腐蚀海底管道可靠性分析[D].大连:大连理工大学,2015.
[3]方娜.海底管道泄漏事故风险分析与应急对策研究[D].青岛:中国石油大学(华东),2014.
[4]夏雪.腐蚀海底管道的可靠性评估[D].哈尔滨:哈尔滨工程大学,2009.
[5]金伟良,张恩勇,邵剑文,等.海底管道失效原因分析及其对策[J].科技通报,2004,20(6):529-533.
[6]王焕焕,杜敏.海洋飞溅区钢结构的防腐蚀技术[J].腐蚀科学与防护技术,2015,27(5):483-491.
[7]鞠虹,王君,唐晓,等.油气集输管道在海洋环境中的腐蚀与防护[J].石油化工设备,2010,39(5):41-48.
[8]吴建华,陈光章.海底管线的腐蚀保护——管道腐蚀与防护讲座之六[J].管道技术与设备,2000(6):35-38.
[9]KIM J H,KIM Y S,KIM J G.Cathodic protection criteria of ship hull steel under flow condition in seawater[J].Ocean Engineering,2016,115:149-158.
[10]范丰钦,宋积文,李成杰,等.海水流速对DH36平台钢阴极保护的影响[J].中国腐蚀与防护学报,2014,34(6):550-557.
[11]邵守斌.数值模拟技术在区域性阴极保护设计中的应用[J].油气田地面工程,2016,35(3):108-110.
[12]曹楚南.腐蚀电化学原理[M].3版.北京:化学工业出版社,2008:125-129.
[13]HUANG H,DONG Z,CHEN Z,et al.The effects of Clion concentration and relative humidity on atmospheric corrosion behaviour of PCB-Cu under adsorbed thin electrolyte layer[J].Corrosion Science,2011,53(4):1 230-1 236.