中文摘要：

采用电化学方法和失重法,研究了球墨铸铁给水管道内腐蚀速率随时间的变化规律,设计了包含预腐蚀阶段的内腐蚀失重实验,通过正交实验设计研究了影响球墨铸铁给水管道内腐蚀的主要因素。结果表明,自来水环境下,球墨铸铁腐蚀速率初期波动较大,并随时间逐步下降,最后趋于稳定,稳定时间约为48 h;影响腐蚀速率的因素按其作用大小排序为：温度〉p H值〉总余氯〉总硬度。

英文摘要：

The tap water corrosion of ductile cast iron for water-supply pipe （DCIWP） is studied by means of electrochemical method and mass loss method. Taking into account the effects of initial corrosion on the correctness of the experimental results, a mass loss test including a period of precorrosion is conducted to study the main influence factors for the corrosion process through the orthogonal test design. The result tums out that at first the corrosion rate of the iron fluctuates signifi- cantly, then declines gradually over time and becomes stable in 48 h finally. The influence of pH of the water and test temperature is roughly equal and far more than the impact of total hardness and total residual chlorine of the water. The main influence factors affecting the corrosion of the ductile cast iron can be ranked as follows： temperature 〉pH 〉total residual chlorine 〉total hardness.