流速和碳链长度对咪唑啉衍生物在高压CO_2环境中缓蚀性能的影响

Effect of Flow Velocity and Carbon Chain Length on Corrosion Inhibition Performance of Imidazoline Derivates in High Pressure CO_2 Environment

合成了5种碳链长度不同的咪唑啉衍生物以及两种碳链中带有双键的咪唑啉衍生物。通过动态失重、SEM、AFM和接触角测定等分析表征手段,研究了它们在碳钢表面上的吸附能力与疏水能力以及在高压CO2环境中在3种流速下对碳钢腐蚀的缓蚀性能。结果表明,咪唑啉碳数为21时疏水效果最好,其浓度为50,100和200 mg/L时,接触角分别为80.5°,87.8°和96.2°。通过测量力曲线,同样发现随碳链的增长,其粘附力逐渐增大,当碳数为21时,粘附力达到最大。高压釜动态失重实验表明,缓蚀剂的缓蚀性能与碳链的长度以及溶液流速有关。流速为0.3和0.6 m/s时,碳数为17时缓蚀效果最好;流速为5.5 m/s时,碳链越长,缓蚀效果越好。同样条件下,碳链中带有双键的咪唑啉的缓蚀效果总是优于碳链中没有双键的咪唑啉的缓蚀效果。

Five imidazoline derivates with different carbon chain length and two imidazoline derivates with double bond in carbon chain were synthesized. Their inhibition performance, adsorption capacity and hydrophobicity were studied in high CO2 pressured solution by means of dynamic mass loss method, SEM, AFM, and contact angle measurement. By contact angle measurement, it was found that the hydrophobic performance of imidazoline derivate with 21 carbon chain length was the best, and the contact angle was 80.5°, 87.8° and 96.2° respectively corresponding to its concentration of 50, 100 and 200 mg/L. By the AFM force curves, it was also found that the longer the carbon chain, the larger the adhesion force. When the chain length was 21, the adhesion reached the highest. The dynamic weight loss experiment showed that the inhibition performance of the imidazoline derivates was related to both the chain length and the flow velocity of the solution. When the flow rate was 0.3 and 0.6 m/s, the derivate with 17 carbons in carbon chain was the best andwhen the flow rate was 5.5 m/s, the longer the carbon chain of imidazoline, the better the inhibition performance. The inhibition performance of imidazoline with double bonds in carbon chain was always better than the one without double bonds under the same condition.