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运用外观检查、断口宏微观形态观察、微区能谱分析以及金相检查等技术手段对支架断裂情况进行分析。结果表明:后排污口支架的断裂性质为铝合金剥离晶间腐蚀失效,支架表面涂层局部受到破坏,裸露基体与污水直接接触是导致支架发生剥离腐蚀的直接原因;而短横方向的变形组织则降低了材料抗腐蚀能力。
The fracture of the scaffolds was analyzed by means of visual inspection, macro and micro morphological observation of fractures, micro-area energy spectrum analysis and metallographic examination. The results show that the fracture properties of the rear sewage outfall are the intergranular corrosion failure of the aluminum alloy strip and the local damage to the surface coating of the stent. The direct contact between the bare matrix and the sewage is the direct cause of the stripping corrosion of the stent. The corrosion resistance of the material is reduced.