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采用真实环道和自制试验装置,模拟起伏管路多相流动条件下X70钢的CO_2腐蚀问题。通过电子显微镜、腐蚀挂片等对挂片表面形貌、腐蚀速率情况进行分析,试验研究了多相流动状态对X70钢CO_2腐蚀速率的影响。结果表明:随着气液比由低到高,管内流型由满管流到段塞流再到弥散流发展,挂片均匀腐蚀速率先是缓慢升高,在段塞流时达到最高值,随着流型由段塞流向弥散流转变,挂片表面均匀腐蚀速率逐渐减小;挂片局部腐蚀不断加强,在弥散流状态下,由于空泡腐蚀的存在,挂片局部腐蚀得到了最大程度的发展。(图7,表4,参10)
The real loop and self-made test equipment were used to simulate the CO 2 corrosion of X70 steel under the condition of multi-phase flow in ups and downs. The morphology and corrosion rate of the coupons were analyzed by electron microscope and coupon etc. The influence of multiphase flow on the CO 2 corrosion rate of X70 steel was investigated experimentally. The results show that with the increase of gas-liquid ratio from low to high, the flow pattern changes from full pipe flow to slug flow to diffuse flow. The uniform corrosion rate increases slowly and reaches the highest value at slug flow. The flow pattern changed from slug flow to diffuse flow, and the uniform corrosion rate on the surface of the coupons gradually decreased. The local corrosion of the coupons was continuously strengthened. Under the condition of dispersed flow, due to the existence of cavitation erosion, the local corrosion of coupons was maximized development of. (Figure 7, Table 4, reference 10)