采用核电厂二回路材料评估试验平台模拟核电厂二回路环境，在高纯度聚丙烯酸（PAA）分散剂条件下研究了不同Cr含量的管道材料的流动加速腐蚀（FAC）速率，并采用扫描电镜观察FAC后管材表面氧化层形貌。结果表明：在150℃、pH （25℃）为9.2，流速为5 m/s，溶解氧含量低于10 μg/L的条件下，连续循环200 h，添加1 mg/L PAA没有加快Cr含量低的WB36 CN1、A106B合金钢的FAC速率，但使Cr含量较高的A335 P22合金钢的FAC速率从0.005 1 mm/a加快至0.007 8 mm/a；PAA通过促进疏松微小氧化物颗粒的分散，减缓颗粒沉积，使A335 P22合金钢表面氧化膜变得疏松多孔；给水中PAA加量不超过5 μg/L时，PAA长期在线应用对二回路管道使用寿命降低的风险较低。

Using nuclear power plant secondary circuit material evaluation test platform to simulate the environment of secondary circuit in power plant, the flow accelerated corrosion (FAC) rates of pipe materials with different Cr content were studied under high-purity polyacrylic acid (PAA) dispersant condition. And the morphology of oxide films on surfaces of pipe materials after FAC was observed by scanning electron microscopy (SEM). The results showed that under the conditions of 150℃, pH (25℃) 9.2, flow rate of 5 m/s, and dissolved oxygen content less than 10 μg/L, continuous circulation for 200 h, adding 1 mg/L PAA did not accelerate the FAC rates of alloy steels WB36 CN1, A106B with low Cr content, but accelerated the FAC rate of alloy steel A335 P22 with high Cr content from 0.005 1 mm/a to 0.007 8 mm/a. PAA made the oxide film on the surface of alloy steel A335 P22 loose and porous by promoting the dispersion of small loose oxide particles and slowing down the deposition of particles. If the dosage of PAA in feed water is no more than 5 μg/L, the risk of service life reduction of the secondary circuit pipe caused by long-term online PAA application should be low.