Wang Xiaohong, Huang Ailing, Lin Dongquan, Talha Mohd, Liu Hao, Lin Yuanhua
School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China.
Materials (Basel). 2020 Oct 20;13(20):4672. doi: 10.3390/ma13204672.
The corrosion inhibition performance of an imidazolium-based ionic liquid (IL), 1-butyl-3-methylimidazolium thiocyanate (BMIm), was studied on AA 6061 alloy in 1 M HCl solution at 303 K, 333 K, and 363 K by gravimetric tests, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) analysis. Scanning electron microscopy with energy dispersive X-ray (SEM-EDX) and X-ray photoelectron spectroscopy (XPS) were used to detect the surface morphologies and chemical composition of the surface films. The results indicate that this IL inhibits AA 6061 corrosion in acid with maximum inhibition efficiencies of 98.2%, 86.6%, and 41.2% obtained at 303 K, 333 K, and 363 K respectively. Inhibition efficiency generally decreased with increasing immersion time; the major exception was at 303 K, whereby the inhibition efficiency was detected to increase with immersion time from 30 to 90 min and then decrease slightly beyond 90 min. The results indicate that BMIm is a mixed-type inhibitor with a predominant effect on cathodic reactions. Surface morphology analyses by SEM revealed less surface damage in the presence of the inhibitor. XPS analysis established the development of a protective film on the AA 6061 surface which was hydrophobic in nature.
通过重量测试、动电位极化和电化学阻抗谱（EIS）分析，研究了一种咪唑基离子液体（IL），即1-丁基-3-甲基咪唑硫氰酸盐（BMIm）在303 K、333 K和363 K温度下对1 M HCl溶液中AA 6061合金的缓蚀性能。采用带有能量色散X射线的扫描电子显微镜（SEM-EDX）和X射线光电子能谱（XPS）检测表面膜的表面形貌和化学成分。结果表明，这种离子液体抑制AA 6061在酸中的腐蚀，在303 K、333 K和363 K时分别获得的最大缓蚀效率为98.2%、86.6%和41.2%。缓蚀效率一般随浸泡时间的增加而降低；主要例外是在303 K时，在此温度下，缓蚀效率在浸泡时间从30分钟增加到90分钟时被检测到增加，然后在90分钟后略有下降。结果表明，BMIm是一种混合型缓蚀剂，对阴极反应有主要影响。通过SEM进行的表面形貌分析表明，在有缓蚀剂存在的情况下表面损伤较少。XPS分析确定了在AA 6061表面形成了一种本质上疏水的保护膜。
