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首页> 外文会议>NACE International corrosion conference expo >Control of Preferential Weld Corrosion of X65 Pipeline Steel in Flowing Brines Containing Carbon Dioxide
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Control of Preferential Weld Corrosion of X65 Pipeline Steel in Flowing Brines Containing Carbon Dioxide

机译：X65管线钢在含二氧化碳的盐水中的优先焊接腐蚀的控制。

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This paper investigates the effectiveness of two typical oilfield corrosion inhibitors in controllingpreferential weld corrosion of X65 pipeline steel in artificial seawater saturated with carbon dioxide atone bar pressure. A rotating cylinder electrode apparatus was designed so that weld metal, heataffected zone and parent material could be tested in high shear stress conditions. The galvaniccurrents flowing between the weld regions were recorded using zero-resistance ammeters and theirself-corrosion rates were obtained by linear polarization resistance measurements.In uninhibited conditions, the weld metal and heat affected zone were cathodic to parent material andno localised corrosion occurred. However, 30 ppm of inhibitor caused a current reversal at low shearstress, resulting in preferential corrosion of the weld metal. At high shear stress, the currents increasedand further reversals occurred. The inhibitors were more effective in controlling the self-corrosion ratesof the parent material than weld metal and heat affected zone. Total corrosion rates were calculatedfrom the sum of the galvanic and self-corrosion contributions and the efficiencies of the two inhibitorswere compared. It was concluded that preferential weld corrosion was caused by unstable conditionsin which the inhibitor film was removed selectively from weld metal and heat affected zone butremained effective on the parent material.
机译：本文研究了两种典型的油田缓蚀剂在控制X65管线钢在人工饱和二氧化碳饱和碳酸氢钠压力下的优先焊接腐蚀中的有效性。设计了旋转圆柱电极设备，以便可以在高剪切应力条件下测试焊接金属，热影响区和母材。使用零电阻电流表记录在焊缝区域之间流动的电流，并通过线性极化电阻测量获得其自腐蚀率。在不受约束的条件下，焊缝金属和热影响区对母材是​​阴极，并且没有发生局部腐蚀。但是，抑制剂含量为30 ppm时，在低剪切应力下会引起电流反转，从而导致焊接金属受到优先腐蚀。在高剪切应力下，电流增加并且发生进一步的逆转。与控制焊缝金属和热影响区相比，抑制剂在控制母材的自腐蚀速率方面更有效。根据电腐蚀和自腐蚀贡献的总和计算总腐蚀速率，并比较两种抑制剂的效率。结论是，优先焊接腐蚀是由不稳定条件引起的，在不稳定条件下，阻焊剂膜从焊接金属和热影响区中选择性去除，但对母材仍然有效。

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