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首页> 外文会议>Eurocorr 2004 >Influence of Turbulent Flow on the Corrosion Kinetics of API X52 PipelineSteel in Aqueous Solutions Containing H2S
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Influence of Turbulent Flow on the Corrosion Kinetics of API X52 PipelineSteel in Aqueous Solutions Containing H2S

机译：湍流对含硫化氢水溶液中API X52管线钢腐蚀动力学的影响

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A corrosion process can be influenced by the relative movement between the corrodingenvironment and the metal. This relative movement could increase the heat transfer and themass transfer of reactants towards and from the surface of the corroding metal, with aconsequent increase in the corrosion rate. Also, if solid particles are present, removal ofprotective films, erosion and wear can occur on the metallic surface. Many industrialprocesses involve the movement of corrosive liquids in close contact to metallic structures.Therefore, the influence of flow on the corrosion processes is an important issue to beconsidered in the design and operation of industrial equipment. This influence is complex andmany variables are involved. Several observations of flow-accelerated corrosion problemshave been documented, particularly in the oil and gas industries, where the combined effect offlow and dissolved gases, such as hydrogen sulphide (H2S) and carbon dioxide (CO2), isimportant.Turbulent flow conditions are commonly found in industrial processes. However, fewcorrosion studies in controlled turbulent flow conditions are available. With the increasingnecessity to describe the corrosion of metals in turbulent flow conditions some laboratoryhydrodynamic systems have been used with different degrees of success. The use of therotating cylinder electrode (RCE), as a laboratory hydrodynamic test system, has gainedpopularity in corrosion studies. This popularity is due to its characteristics, such as, itsoperation mainly at turbulent flow conditions; its well understood mass transfer properties andits easiness of construction and operation.The aim of the present work is to explore the effect that turbulent flow conditions have on theelectrochemical kinetics of steel samples immersed in aqueous environments containing H2S.In order to control the turbulent flow conditions in the laboratory, a rotating cylinder electrode(RCE) was used. In order to obtain information on the electrochemical and corrosion kinetics,Linear Polarisation Resistance (LPR), Electrochemical Impedance Spectroscopy (EIS) andPotentiodynamic Polarisation curves were measured at different immersion times. It wasfound that the overall corrosion process is affected by the movement of the electrolyte,increasing both corrosion potential and corrosion rate, as the rotation rate of the electrodeincreases. It was also found that the anodic reaction is flow independent and the total cathodicreaction is flow dependent.
机译：腐蚀过程会受到腐蚀环境与金属之间的相对运动的影响。这种相对运动可能会增加反应物向腐蚀金属表面的传热和从腐蚀金属表面传出的质量，从而提高腐蚀速率。同样，如果存在固体颗粒，则保护膜的去除，腐蚀和磨损会在金属表面上发生。许多工业过程涉及腐蚀性液体与金属结构紧密接触的运动，因此，流量对腐蚀过程的影响是工业设备设计和操作中要考虑的重要问题。这种影响是复杂的，涉及许多变量。已经记录了对流动加速腐蚀问题的一些观察结果，特别是在石油和天然气工业中，其中流动和溶解气体（例如硫化氢（H2S）和二氧化碳（CO2））的综合影响很重要。通常发现湍流条件在工业过程中。但是，在受控的湍流条件下很少进行腐蚀研究。随着描述湍流条件下金属腐蚀的必要性越来越高，已经使用了一些实验室流体动力学系统，并取得了不同程度的成功。旋转圆柱电极（RCE）作为实验室水动力测试系统的使用已在腐蚀研究中广受欢迎。这种流行是由于它的特性，例如，它主要在湍流条件下运行。本研究的目的是探讨湍流条件对浸入含H2S的水环境中的钢样品电化学动力学的影响，以控制湍流条件。在实验室中，使用了旋转圆柱电极（RCE）。为了获得有关电化学和腐蚀动力学的信息，在不同的浸入时间下测量了线性极化电阻（LPR），电化学阻抗谱（EIS）和电动力极化曲线。已经发现，随着电极的旋转速率的增加，整个腐蚀过程受电解液的运动的影响，腐蚀电位和腐蚀速率都增加。还发现，阳极反应与流量无关，而总阴极反应与流量有关。

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