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循环水设备穿孔主要在于垢下腐蚀 设备穿孔往往是因为垢下腐蚀,垢下腐蚀又称为氧浓差电化学腐蚀,即缺氧区变阳极,被腐蚀,是设备穿孔的主要原因。当金属表面有垢、粘泥等覆盖物时,形成了氧浓差电池,垢下是缺氧区,氧气进不来,成为阳极,失电子金属不断溶解:垢外是富氧区,成为阴极,只负责消耗电子,不腐蚀。溶解的金属离子水解会使垢下变酸性,同时氯离子等进去维持电中性,形成强腐蚀性的酸性氯化物溶液,造成深坑状点蚀
0:31
循环水设备穿孔主要在于垢下腐蚀 设备穿孔往往是因为垢下腐蚀,垢下腐 …
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