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首页> 外文期刊>Journal of Materials Engineering and Performance >Investigation on Preferential Corrosion of Welded Carbon Steel Under Flowing Conditions by EIS
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Investigation on Preferential Corrosion of Welded Carbon Steel Under Flowing Conditions by EIS

机译：用EIS研究流动条件下焊接碳钢的优先腐蚀

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摘要

Carbon steels are used extensively in construction of oil and gas pipes but they exhibit poor corrosion-resistance properties because of internal corrosion. In this research, a rotating cylinder electrode apparatus was designed so that electrodes machined from the weld metal, heat-affected zone, and parent material of a welded X65 pipeline steel could be tested in high shear stress conditions using electromechanical impedance spectroscopy. The aim was to investigate the cause of the severe localized corrosion that sometimes occurs at welds in carbon steel pipelines carrying hydrocarbons and inhibited brine solutions saturated with carbon dioxide. It was concluded that the surface films play an important role in effective inhibition, and this inhibition is more effective on a clean surface rather than on a precorroded one.
机译：碳钢被广泛用于油气管道的构造，但是由于内部腐蚀，它们的耐腐蚀性较差。在这项研究中，设计了一种旋转圆柱电极设备，以便可以利用机电阻抗谱在高剪切应力条件下测试由焊接的X65管线钢的焊接金属，热影响区和母材加工而成的电极。目的是研究严重局部腐蚀的原因，这种腐蚀有时发生在载有碳氢化合物的碳钢管道的焊接处，并抑制了被二氧化碳饱和的盐溶液。结论是，表面膜在有效抑制中起重要作用，这种抑制作用在清洁的表面上比在预腐蚀的表面上更有效。

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