水质变化时垢层对铸铁腐蚀的影响作用  

Influence of Corrosion Scale on Cast Iron under the Change of Water Qualities

作　　者：张雅君[1] 姚凌峰 孙丽华[1] 李斯[3] 许萍[1] 杜婷婷[2] 

机构地区：[1]北京建筑大学,城市雨水系统与水环境省部共建教育部重点实验室,100044 [2]北京建筑大学环境与能源工程学院,100044 [3]中科院建筑设计研究院有限公司,北京100080

出　　处：《水处理技术》2016年第4期75-79,共5页Technology of Water Treatment

基　　金：国家自然科学基金项目(51278026)

摘　　要：通过对水质变化时铸铁腐蚀速率与铁释放的对比,研究垢层对铸铁腐蚀的影响作用。结果表明,改变水的硬度和拉森指数(LR),对铸铁的腐蚀速率与铁释放均有明显影响;低硬度水质条件下形成的管垢以较易分解和转化的Fe(OH)_3为主,而较为稳定的Fe_3O_4含量较低,在硬度或LR改变时,管垢破坏严重,铸铁基底腐蚀加剧;高硬度水质下形成的管垢较为致密,表面覆盖大量的CaCO_3,且含有较多Fe_3O_4和FeOOH,管垢整体结构稳定,在硬度或LR改变时,能抑制铸铁基底的进一步腐蚀。Comparing the corrosion rate and iron release of cast iron under the changes of water qualities, the influence of corrosion scale on cast iron was studied. The results showed that the change of water hardness and Larson Index had significant influence on the corrosion rate and iron release of cast iron. The corrosion scale formed under low water hardness was mainly composed of Fe（OH）3 which decomposed and changed easily while the content of Fe3O4 was low but stable. When the water quality changed, corrosion scale would be damaged seriously and cast iron would be eroded faster. However, the corrosion scale formed under high water hardness had compact structure which was covered by much CaCO3 and was composed of a mass of stable Fe3O4 and FeOOH. When the water quality changed, corrosion scale could resist erosion and decrease the corrosion of cast iron.

关 键 词：腐蚀速率 铁释放 垢层 硬度 拉森指数 

分 类 号：TU991.38[建筑科学—市政工程]