Fluorocarbon-hydrocarbon hybrid cationic surfactants: Synthesis, surface-activity properties and anti-corrosion performance
Fluorocarbon-hydrocarbon hybrid cationic surfactants: Synthesis, surface-activity properties and anti-corrosion performance
复制标题
氟烃杂化阳离子表面活性剂的合成、表面活性及防腐性能
DOI：
10.1016/j.molliq.2020.112897
复制
发表时间：
2020-05-15
影响因子：
6
通讯作者：
Zhang, Aidong
中科院分区：
文献类型：
--
作者：
Nuer, Maimaiti;Duan, Jiang;Zhang, Aidong
氟碳化合物-碳氢化合物杂化阳离子表面活性剂具有独特的性能，因为它们联合收割机了氟碳化合物和碳氢化合物表面活性剂的特性，然而，它们作为金属缓蚀剂的潜力尚未得到解决。在此，分别使用全氟丁基磺酰基和全氟己基磺酰基链，通过N-苄基-N '，N'-二甲基乙二胺的阳离子桥与作为烃链的己基连接，合成了两种杂化阳离子表面活性剂（F4 H6和F6 H6）。F4 H6和F6 H6均表现出低临界胶束浓度（1.81 × 10（-3）和3.76 × 10（-4）M）和高水表面活性（表面张力分别低至22.07和1822 mN/m）。在1.0 M HCl溶液中，它们对碳钢的缓蚀率分别为92.7%和95.8%，与电化学阻抗谱的结果相似。两种表面活性剂均属于混合型缓蚀剂，在碳钢表面的吸附符合Langmuir吸附等温式。通过接触角、SEM和XPS的表面分析表明，F6 H6倾向于在碳钢上形成比F4 H6更致密的吸附层，更有效地防止腐蚀性物质对金属的腐蚀。结果表明，此类杂化阳离子表面活性剂是一种具有广阔应用前景的金属缓蚀剂。(C)2020 Elsevier B. V.保留所有权利。
Fluorocarbon-hydrocarbon hybrid cationic surfactants possess unique performance because they combine the characteristics of fluorocarbon and hydrocarbon surfactants, however, their potential as metal corrosion inhibitors has not been addressed. Here, two hybrid cationic surfactants (F4H6 and F6H6) were synthesized using perfluorobutylsulfonyl and perfluorohexylsulfonyl chains, respectively, through a cationic bridge of N-benzyl-N',N'-dimethyl ethylenediamine, to connect with a hexyl group as the hydrocarbon chain. Both F4H6 and F6H6 exhibited low critical micelle concentrations as 1.81 x 10(-3) and 3.76 x 10(-4) M and high aqueous surface activities with surface tensions as low as 22.07 and 1822 mN/m, respectively. Their anti-corrosion performance for carbon steel in 1.0 M HCl was demonstrated with inhibition efficiencies up to 92.7% and 95.8% at 15 x 10(-4) M by potentiodynarn ic polarization, similar to the results obtained by electrochemical impedance spectroscopy. Both surfactants belong to mixed-type inhibitors and adsorbed on carbon steel following the Langmuir isotherm model. Surface analyses by contact angle, SEM, and XPS revealed that F6H6 tended to form an adsorption layer more densely packed than F4H6 on carbon steel, more efficiently preventing corrosive species from corroding the metal. The results proved that such hybrid cationic surfactants can be utilized as promising metal corrosion inhibitors with the potential for wide applications. (C) 2020 Elsevier B.V. All rights reserved.