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首页> 外文期刊>International Journal of Electrochemical Science >Corrosion Inhibition of Pipeline Steel X-70 in Sour Brine by an Imidazoline Derivative under Flow Assisted Conditions
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Corrosion Inhibition of Pipeline Steel X-70 in Sour Brine by an Imidazoline Derivative under Flow Assisted Conditions

机译：流动辅助条件下咪唑啉衍生物对酸性盐水中管线钢X-70的缓蚀作用

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摘要

The corrosion behavior of a pipeline steel API 5L X-70 was tested under flow assisted conditions in a sour brine solution containing kerosene in the presence of an imidazoline derivative. Inhibitor film provided efficiencies in the range of 70-99% at 200 ppm with initial corrosion rates in the range of 125-134 mpy (3.2-3.4 mm/y). In the absence of inhibitor, chemical species of cubic maghemite (Fe2O3) predominated with an apparent decrease in orthorhombic marcasite (FeS2) on the steel surface when angle was increased from 30° to 90°. In the presence of inhibitor, maghemite (Fe2O3) and marcasite (FeS2) prevailed as a mixture of oxides and sulfides at the impingement angles. Mackinawite appeared with and without the presence of corrosion inhibitor at every angle tested. As flow rate and angle are increased, inhibitor efficiency decreased due to partial film formation. Imidazoline derivative is efficient albeit a periodic replenishment is required after a 3-4 hour period. DFT molecular simulation of imidazoline derivative emphasized nitrogen polarity and capability of interacting with another molecular species.
机译：在咪唑啉衍生物的存在下，在含煤油的酸性盐水溶液中，在流动辅助条件下，对API 5L X-70管线钢的腐蚀行为进行了测试。抑制剂膜在200 ppm时的效率在70-99％的范围内，初始腐蚀速率在125-134 mpy（3.2-3.4 mm / y）的范围内。在没有抑制剂的情况下，当角度从30°增大到90°时，立方磁赤铁矿（Fe2O3）的化学物种占主导地位，而钢表面的斜方菱铁矿（FeS2）明显降低。在存在抑制剂的情况下，磁赤铁矿（Fe2O3）和镁铁矿（FeS2）在冲击角处以氧化物和硫化物的混合物形式存在。在每个测试角度，在有和没有腐蚀抑制剂的情况下都出现了马基诺石。随着流速和角度的增加，抑制剂的效率由于部分成膜而降低。咪唑啉衍生物是有效的，尽管3-4小时后需要定期补充。咪唑啉衍生物的DFT分子模拟强调了氮的极性和与另一种分子相互作用的能力。

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