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      建筑扣件疲劳点蚀使得建筑扣件工作过热及建筑扣件间隙过大,造成建筑扣件中部疲劳损伤、疲劳点蚀或者疲劳脱落。这种损伤大多是因为超载、建筑扣件间隙过大或者润滑油不清洁、内中混有异物所致。润滑油中所含的化学杂质使建筑扣件合金氧化而生成酸性物质,建筑扣件合金腐蚀一般是区为润滑油不纯,引起建筑扣件合金局部脱落,形成无规则的微小裂孔或小凹坑。建筑扣件存在着合金腐蚀、烧熔、疲劳点蚀、机械损伤、穴蚀等几种损坏的形式,外表层发生塑性变形和冷作硬化,滑动建筑扣件在气缸压力冲击载荷反复作用下,局部丧失变形能力,逐步形成纹并不断扩展,然后随着磨屑的脱落,受载外表层形成穴。一般轴瓦发生穴蚀时,先出现凹坑,然后这种凹坑逐步扩大并引起合金层界面的开裂,裂纹沿着界面的平行方向扩展,直到剥落为止。 严重时在接触外表发生金属剥离以及出现大面积的杂乱划伤。  

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