目的 探究CO2腐蚀对钻杆材料多冲疲劳性能的影响规律，分析表面腐蚀产物对多冲性能是否有严重影响。方法 利用自主研发的多冲疲劳断裂试验机，测试V150和S135钻杆材料在常温常压下饱和CO2溶液中浸泡腐蚀不同时间后的冲断累积能量，利用失重法计算各试样的腐蚀速率，并用扫描电子显微镜（SEM）观察腐蚀后的表面形貌及冲断后的断口形貌，用XRD测试了腐蚀产物的主要成分。结果 两种材料在CO2腐蚀环境中的腐蚀速率均达到了0.05 mm/a以上，属于中度腐蚀，但S135材料的腐蚀速率略低于V150。随着腐蚀时间的增加，两种材料的冲断累积能量均不断下降，但腐蚀速率稍低的S135材料的冲断累积能量下降率（19.68%）低于V150（22.54%）。CO2腐蚀使钻杆材料表面产生了龟裂状形貌和结晶状腐蚀产物，其主要成分为Fe(HCO3)2。CO2腐蚀并未对内部组织结构造成较大影响，未造成钻杆材料的脆断。 结论 在CO2腐蚀环境下的钻杆材料，尽管腐蚀速率较高，但CO2腐蚀对材料多冲疲劳性能的影响小于H2S腐蚀，腐蚀速率不是影响材料多冲性能的关键因素。

The work aims to investigate the effect rules of CO2 corrosion on the repeated impact fatigue properties of drill pipe materials and analyze whether surface corrosion products have serious impact on multiple impact properties. The cumulative impact energy of V150 and S135 after immersion in saturated CO2 solution for different corrosion time at normal temperature and ordinary pressure was tested by the independently developed repeated impact fatigue testing machine. The corrosion rate of each sample was calculated by weight loss method. The surface morphology after corrosion and fracture morphology were observed by scanning electron microscope (SEM). The main components of corrosion products were tested by XRD. The corrosion rates of the two materials in the CO2 corrosion environment reached more than 0.05 mm/a, which belonged to moderate corrosion, but the corrosion rate of S135 was slightly lower than that of V150. With the increase of corrosion time, the cumulative impact energy of the two materials decreased continuously, but the cumulative energy decline rate (19.68%) of S135 with lower corrosion rate was lower than that (22.54%) of V150. The CO2 corrosion caused the crack morphology and crystalline corrosion products on the surface of the drill pipe materials which mainly consisted of Fe(HCO3)2. The CO2 corrosion did not affect the internal structure obviously or cause the brittle fracture of the drill pipe materials. The corrosion rate of drill pipe materials under corrosion environment is higher, but the effect of CO2 corrosion on the repeated impact fatigue properties is smaller than H2S. Therefore, the corrosion rate is not the key factor affecting the repeated impact fatigue properties of drill pipe materials.