温度和含水量对P110钢在[Bim]Cl/CuCl离子液体中电化学腐蚀性能的影响

Effect of Temperature and Water Content on Electrochemical Corrosion Property of P110 Steel in [Bim]Cl/CuCl Ionic Liquids

不同体系离子液体的含水量和温度对金属腐蚀速率的影响不同,有必要针对特定的腐蚀体系进行研究。针对离子液体对石油套管钢的腐蚀问题,利用失重法、动电位极化及电化学阻抗谱等方法研究了不同温度及含水量的[Bim]Cl/CuCl离子液体对P110钢的电化学腐蚀行为的影响,并通过SEM、EDS以及XRD对腐蚀产物形貌、成分进行表征分析。结果表明:随着温度的升高,离子液体中阴、阳离子的活性增强,P110钢在离子液体中的腐蚀速率逐渐增大;在含水量为0～20%时,随着含水量的增加,腐蚀速率先增大后减小,在含水量为10%时腐蚀速率最大;当含水量增加到30%时,腐蚀产物(FeN0.008 8与Cu)形成的膜起到保护作用,腐蚀速率比含水量为20%时大但比10%时小; P110钢在含水量为0～30%的离子液体中腐蚀过程主要由电荷转移过程控制。

Aiming at the corrosion of petroleum casing steel with ionic liquid,the influences of different temperature and water content on the corrosion electrochemical behavior of P110 steel in [Bim]Cl/CuCl ionic liquid were studied by weight loss method,potentiodynamic polarization and electrochemical impedance spectroscopy. Moreover,the composition of corrosion products were characterized by SEM,EDS and XRD methods. Results showed that with the increase of temperature,the activity of anion and cation in ionic liquid was enhanced,which improved the corrosion rate of P110 steel in ionic liquid. When the water content increased from 0 to 20%,the corrosion rate increased firstly and then decreased,reaching the maximum at 10% of water content. When the water content increased to 30%,the corrosion products( Fe N0.008 8 and Cu) could formed a film with protective effect,and therefore the corrosion rate was higher than that at 20% of water content but lower than that at 10% water content. Besides,the corrosion process of P110 steel in ionic liquids with water content of 0-30% was mainly controlled by the charge transfer process.