3种质子酸离子液体对Q235钢腐蚀行为的影响

Influence of Three Proton Acid Ionic Liquids on Corrosion Behavior of Q235 Steel

通过电化学测试方法研究了Q235钢在1-甲基-3-(4-磺酸基丁基)咪唑硫酸氢盐[(CH2)4SO3HMIm][HSO4](IL1)、N-(4-磺酸基丁基)吡啶硫酸氢盐[(CH2)4SO3HPy][HSO4](IL2)、N-(4-磺酸基丁基)三乙基铵硫酸氢盐[(CH2)4SO3HTEA][HSO4](IL3)等3种Br?nsted酸离子液体中的腐蚀行为,通过扫描电镜(SEM)观察了实验后Q235钢的表面腐蚀形貌及产物的元素组成,分析了Q235钢在3种离子液体中的腐蚀机理。结果表明,Q235钢在这3种不同离子液体中的耐腐蚀性从强到弱的顺序为:IL3>IL2>IL1。同时,升高温度,Q235钢的腐蚀速率随之增加。

The corrosion behavior of Q235 steel in three proton acid ionic liquids with different cations,i.e.3-methyl-l-(4-sulfonic acid) butyl imidazolium hydrogen sulfate [(CH2)4SO3HMIm][HSO4](IL1),N-(4-sulfonic acid) butylpyridinium hydrogen sulfate [(CH2)4SO3HPy][HSO4](IL2) and N-(4-sulfonic acid) butyl triethylammonium hydrogen sulfate) [(CH2)4SO3HTEA][HSO4](IL3) were studied.The surface morphology and compositions of the corrosion products were examined by scanning electron microscopy(SEM).The results revealed that the Q235 steel exhibited rather good resistance to these liquids and its corrosion rates increased with the increasing temperature.Corrosion resistance of Q235 steel in the three ionic liquids decreases according to an order as follows:IL3>IL23>IL1,and finally the electrochemical corrosion mechanism is also proposed.