CARR二回路冷却系统碳钢管道的腐蚀与防护

针对中国先进研究堆(CARR)的特殊性,以静态挂片实验与动态模拟实验相结合,采用挂片失重的方法计算腐蚀速率,着重从Cl-、SO2-4、Mg2+和Ca2+浓缩比,pH值,缓蚀阻垢剂浓度等方面开展了碳钢腐蚀影响因素的分析与研究。结果表明,在CARR二回路中,Cl-、SO2-4、Mg2+和Ca2+的浓缩比为2~3,pH值为8.0~8.5,缓释阻垢剂LJ-301的浓度为0.12g/L左右的水质为最佳状态,经24h浸泡或循环水冲击下,20#碳钢的防腐效果明显。

Corrosion and Protection of Carbon Steel Pipe in Cooling System of CARR Secondary Loop

According to the characteristics of CARR, the weight loss measurement was used to calculate the corrosion rate. This method combined the static test and dynamic simulation associated with the analysis of the factors for carbon steel corrosion, and the ion concentration ratios of Cl^-, SO^2-₄, Mg²⁺ and  Ca²⁺ and the pH value as well as the content of corrosion inhibitor LJ-301 were mainly studied. The results show that in the secondary loop of CARR, the water quality is at the best state when Cl^-, SO^2-₄, Mg²⁺ and Ca²⁺ concentration ratios are 2.3, pH value range is 8.0-8.5, and the concentration of corrosion inhibitor LJ-301 is about 0.12 g/L. The anti-corrosion effect of 20# carbon steel is obvious after 24 hours soak or water impingement.