目的 研究 CO2/盐水环境下，温度对 J55 碳钢腐蚀的影响以及腐蚀形貌的描述方法。方法 利用高温高压反应釜模拟 9 MPa、不同温度下的 CO2/盐水腐蚀环境，分别测定 50、65、80 ℃下 J55 碳钢的平均腐蚀速率。利用全自动三维显微成像系统对腐蚀后的试片表面进行大面积图像扫描、提取和分析，表征不同温度下的腐蚀形貌特征。同时，在不同温度和压力的条件下，在 CO2/盐水环境中对 J55 碳钢进行腐蚀试验，验证腐蚀形貌的分布规律。结果 随着温度的升高，CO2/盐水对 J55 碳钢的平均腐蚀速率先减小后增大，65 ℃ 时，平均腐蚀速率为 2.1871 mm/a。在明场、放大倍数为 200 倍、重合度为 10%的 9 视域拼接条件下采集试片表面腐蚀形貌，采集图像面积占整个试片的 12.28%。试片表面腐蚀深度分布符合 Gauss 分布，相关系数为 0.9790，参数 xc与平均腐蚀速率随温度的变化趋势一致，参数 w 能反映腐蚀形貌类型。不同温度和压力下，CO2/盐水环境对 J55 碳钢腐蚀试验的结果相同。结论 随着温度的升高，CO2/盐水环境对 J55 碳钢的腐蚀形态由点蚀逐渐转变为均匀腐蚀。试片表面腐蚀深度分布符合 Gauss 分布，且参数能反映 CO2/盐水环境对 J55 碳钢的腐蚀规律。该腐蚀形貌描述方法可有效避免腐蚀形貌描述中的主观性和随机性。

The work aims to study the effect of temperature on corrosion of J55 carbon steel in CO2/brine environment and the description method of corrosion morphology. CO2/brine corrosion environment at 9 MPa and different temperature was simulated by autoclave and the average corrosion rate of J55 carbon steel was determined respectively at 50 ℃, 65 ℃ and 80 ℃. Corroded coupons surface was scanned, extracted and analyzed by the full-automatic 3-D microscopic imaging system and the characteristics of corrosion morphology were characterized at different temperature. At the same time, J55 carbon steel corrosion test in CO2/brine environment was conducted at different temperature and pressure in order to verify the distribution of corrosion morphology. With the increase of temperature, the average corrosion rate of CO2/brine to J55 carbon steel decreased first and then increased and the average corrosion rate was 2.1871 mm/a at 65 ℃. The surface corrosion morphology of the coupon was collected in 9-threshold splicing with magnification times of 200 and contact ratio of 10% in the bright field. Extracted image area accounted for 12.28% of the whole coupon. The surface corrosion depth distribution of coupon accorded with the Gauss distribution. The correlation coefficient was 0.9790. The change trend of xc and average corrosion rate was consistent with temperature. The parameter w could reflect the type of corrosion morphology. The same conclusion was obtained from the corrosion test of J55 carbon steel at different temperature and pressure in CO2/brine environment. With the increase of temperature, the corrosion morphology of CO2/brine environment on J55 steel gradually transforms to uniform corrosion from pitting corrosion. The surface corrosion depth distribution of coupon accords with Gauss distribution and the parameters can reflect the corrosion behavior of CO2/brine water on J55 carbon steel. The corrosion morphology description method can effectively avoid subjectivity and the randomness in the description of morphology.