Abstract The corrosion of district heating (DH) pipelines in the internal environment is carefully controlled, however the long-terms of corrosion induced fracture is still uncertain. The general corrosion of pipeline in the heating water is very moderate, therefore it is almost not affected to initiate fracture. While, localized corrosion in weld zone is very dangerous situation because it can act as a stress concentration point. Therefore, it is significant to analyze using the fracture mechanics whether a fracture actually occurs due to the localized corrosion or not. In this study, the long-term corrosion was simulated using the electrochemical acceleration method. The surface morphology parameter of the accelerated specimen was analyzed using a 3D profiler. The crack tip opening displacement (CTOD) was calculated using the corrosion morphology parameters. Consequently, in internal DH environment, general corrosion is the dominant factor in fracture rather than localized corrosion. In other words, internal corrosion cannot be a main reason of the DH pipeline fracture.

中文翻译：

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基于断裂力学和电化学加速动力学的区域供热管道内腐蚀特性评价

摘要 集中供热（DH）管道在内部环境中的腐蚀得到严格控制，但腐蚀引起的断裂的长期性仍不确定。管道在供暖水中的普遍腐蚀是非常温和的，因此几乎不影响引发断裂。而焊接区的局部腐蚀是非常危险的情况，因为它可以作为应力集中点。因此，利用断裂力学来分析断裂是否是由于局部腐蚀而真正发生具有重要意义。在这项研究中，使用电化学加速方法模拟了长期腐蚀。使用 3D 轮廓仪分析加速试样的表面形貌参数。使用腐蚀形态参数计算裂纹尖端张开位移（CTOD）。因此，在内部 DH 环境中，全面腐蚀是断裂的主要因素，而不是局部腐蚀。换言之，内腐蚀不能成为DH管道断裂的主要原因。