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首页> 外文期刊>Ocean Engineering >Understanding the influences of temperature and microstructure on localized corrosion of subsea pipeline weldment using an integrated multi-electrode array
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Understanding the influences of temperature and microstructure on localized corrosion of subsea pipeline weldment using an integrated multi-electrode array

机译：使用集成的多电极阵列了解温度和微观结构对海底管道焊件局部腐蚀的影响

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摘要

The localized corrosion behaviour of an X65 subsea pipeline weldment in CO2-saturated formation water was studied using weldment coupon and a novelly designed weldment multi-electrode array (WMEA). The dynamic progression of localized corrosion on different welding areas i.e. base metal (BM), heat affected zone (HAZ) and welding metal (WM) was probed by WMEA. The influences of the solution temperature and the steel microstructure on the localized corrosion of subsea pipeline weldment were analysed. The test results show that HAZ and WM would act as anodes registering a high corrosion rate which was controlled by both micro-cell corrosion and macro-cell corrosion below 50 degrees C. While, if the temperature increased higher than 50 degrees C, WM would transfer from major anode to significant cathode due to the preferential deposition of FeCO3 crystal on WM. Part areas of HAZ would act as the main anodic sites and maintain a high local anodic dissolution rate due to the macro-cell current which is induced by the inhomogeneous FeCO3 film covering.
机译：利用焊件试样和新颖设计的焊件多电极阵列（WMEA），研究了X65海底管道焊件在CO2饱和地层水中的局部腐蚀行为。用WMEA探测了在不同焊接区域即母材（BM），热影响区（HAZ）和焊接金属（WM）上局部腐蚀的动态进程。分析了固溶温度和钢组织对海底管道焊件局部腐蚀的影响。测试结果表明，HAZ和WM充当阳极，具有较高的腐蚀速率，而该腐蚀速率受低于50摄氏度的微孔腐蚀和大孔腐蚀的控制。而如果温度升高到高于50摄氏度，WM会腐蚀阳极由于FeCO3晶体在WM上的优先沉积，从主要阳极转移到重要阴极。由于不均匀的FeCO3薄膜覆盖引起的大电池电流，HAZ的部分区域将充当主要的阳极位置，并保持较高的局部阳极溶解速率。

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