温度对P110钢腐蚀行为的影响

模拟油气田环境，采用高温高压釜进行失重法腐蚀实验，用扫描电子显微镜(SEM)、能散X射线谱仪(EDS)和X射线衍射(XRD)技术研究油管钢P110在不同温度下的CO₂ 腐蚀产物。结果表明：静态和流速为5 m/s时，随着温度的升高，P110钢的腐蚀速率先增大后减小，前者在100 ℃时达到最大，后者在60 ℃时达到最大，且在160 ℃时，两者腐蚀速率趋同；温度大于140 ℃时，流速对腐蚀速率的影响已不再明显，随着温度的继续升高，腐蚀速率变化趋于平缓。温度通过影响腐蚀产物膜的形貌、结构、化学组成、产物膜因子和膜的厚度等，进而影响材料的腐蚀速率。

INFLUENCES OF TEMPERATURE ON CORROSION BEHAVIOR OF P110 STEEL

Influences of temperature on CO₂ corrosion behavior of P110 steel were investigated in stimulated oil and gas field environments. The corrosion scales were analyzed by using SEM，EDS and XRD. Simultaneously, the corrosion rate was measured by the weight loss method. The results showed that the corrosion rate of P110 steel increased first and decreased subsequently with the increase of temperature at static state, and the maximal corrosion rate was presented at 100 ℃. Corrosion rate increased first and deceased subsequently with increasing temperature at 5 m/s too, the maximal corrosion rate was presented at 60 ℃ and the corrosion rate under dynamic and static state were equivalent approximately at 160 ℃. The effect about flow rate operated on corrosion rate was not obvious when temperature was more than 140 ℃, and there were lesser change of the corrosion rate with further increasing temperature. After analyzing, a conclusion can be drawn that temperature affected corrosion rates in that it changed the surface morphologies, constructions, compositions, corrosion scale factor, scale density of the material and so on.