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首页> 外文期刊>RSC Advances >Corrosion behaviour of mild steel in 1-alkyl-3-methylimidazolium tricyanomethanide ionic liquids for CO2 capture applications
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Corrosion behaviour of mild steel in 1-alkyl-3-methylimidazolium tricyanomethanide ionic liquids for CO2 capture applications

机译：1-烷基-3-甲基咪唑三氰基甲基离子液中的低碳钢腐蚀行为，用于CO2捕获应用

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The corrosion behaviour of mild steel (MS) was systematically investigated as a function of the alkyl chain length in the cation of 1-alkyl-3-methylimidazolium tricyanomethanide ([C _( n ) mim]TCM, n = 2, 4, 6 and 8) ionic liquids (ILs) with respect to their potential application as a structural material and solvents for CO _(2) capture plants respectively. The surface of MS was examined by scanning electron microscopy, energy dispersive X-ray spectroscopy and micro-Raman mapping before and after immersion testing at temperatures of 70 and 80 °C for durations varying from 1 hour to 10 days. Corrosion initiates at the sites of MnS inclusions on the surface of MS, resulting in the formation of cavities due to the MnS dissolution, which may be surrounded by corrosion products containing magnetite (Fe _(3) O _(4) ) and maghemite (γ-Fe _(2) O _(3) ). The amount of the corrosion products generated around the inclusion sites decreased with the increase of the cation alkyl chain length, following the order [C _(2) mim]TCM > [C _(4) mim]TCM > [C _(6) mim]TCM ≈ [C _(8) mim]TCM. This was attributed to the corrosion inhibition effect of the ILs through adsorption on the metal surface and blocking active sites, with the inhibition efficiency increasing with the alkyl chain length. The underlying mechanism was associated with corrosion processes at active sites on the MS surface, such as sulphide inclusions, in the presence of residual water and oxygen in the IL. It was shown that increase of the water content in the ILs to about 50?000 ppm resulted in faster dissolution of the MnS inclusions. Finally, it was demonstrated that removal of oxygen from the IL significantly reduced the corrosion rate.
机译：系统地研究了低碳钢（MS）的腐蚀行为作为烷基链长度在1-烷基-3-甲基咪唑鎓三氰基甲基乙胺（[C _（N）MIM] TCM，N = 2,4,6的阳离子中的函数和8）离子液体（ILS）相对于它们的潜在应用作为分别为CO _（2）捕获植物的结构材料和溶剂。通过扫描电子显微镜，能量分散X射线光谱和微拉曼映射在70至80℃的温度下浸没测试之前和微拉曼映射来检查MS的表面，以使持续时间从1小时到10天变化。腐蚀在MS表面上的MNS夹杂物的位置引发，导致由于MNS溶解引起的空腔形成，其可以被含有磁铁矿的腐蚀产物包围（Fe _（3）O _（4））和Maghemite（ γ-FE _（2）O _（3））。在阳离子烷基链长度的增加下，在阳离子烷基链长度的增加下，围绕夹杂物部位产生的腐蚀产物的量随[C _（2）MIM] TCM> [C _（4）MIM] TCM> [C _（6 ）MIM]TCM≈[C _（8）MIM] TCM。这归因于ILS通过在金属表面和阻断活性位点上吸附的腐蚀抑制作用，抑制效率随烷基链长度而增加。潜在机制与MS表面上的活性位点的腐蚀过程相关，例如硫化物夹杂物，在IL中存在残留的水和氧气。结果表明，IL中的水含量的增加至约50Ω000ppm导致MNS夹杂物的溶解速度更快。最后，证明从IL中除去氧气显着降低了腐蚀速率。

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