中文摘要：

以氢化丁腈橡胶O型密封圈为对象,模拟橡胶密封件的工作环境,在压力25 MPa、温度120℃、实验周期168 h、气相组成5 vol%CO2、95 vol%N2的条件下,进行O型密封圈高温高压腐蚀实验。从材质、结构、组分、物理性能和断口形貌几方面对其进行实验前后的对比分析,研究橡胶密封件在高温高压高含CO2环境中的腐蚀损伤行为。实验结果显示：橡胶O型圈腐蚀后物理性能下降,且承压状态下的腐蚀损伤程度比自由状态下弱,应以承压状态下的分析结果作为橡胶密封制品应用时的主导参考;橡胶材料腐蚀后其分子结构和填料会受到破坏,造成橡胶材料性能下降;未服役的橡胶O型圈的拉伸断口多为韧性断口,而橡胶材料在服役时发生腐蚀老化,腐蚀后的拉伸断口多为脆性断口。

英文摘要：

Taking the hydrogenated nitrile rubber O-ring as the research object, through the simulation of the working conditions of the rubber seal, corrosion tests on O-rings were conducted at pressure 25 MPa, temperature 120℃, test period 168 h, and gas phase composition 5 vol%CO2, 95 vol%N2. Through comparing the material structure, composition, mechanical properties and fracture morphology of O-rings before and after corrosion, the corrosion damage behavior of rubber seal in high temperature and high pressure high CO2 environment was studied. The result shows that after corrosion, the mechanical properties of O-rings decreased, and the corrosion degree in the compressive state was weaker than that in the free state, therefore, the analysis results in the compressive state should be the leading reference in a practical application. The molecular structure and fillers were damaged after corrosion, causing the performance of the rubber material decreased. The tensile fracture of the initial rubber O-ring mostly was ductile fracture, while after corrosion, it mostly was brittle fracture.