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采用失重法、电化学方法、XPS和SEM分析了2-十一烷基-N-羧甲基-N-羟乙基咪唑啉(UHCI)对20#碳钢在模拟海水淡化一级反渗透产水中的缓蚀行为。结果表明:UHCI对20#碳钢具有缓蚀作用,并且随着UHCI浓度的增加,缓蚀效率明显增大;UHCI减小了碳钢电极的阳极电流密度,是一种阳极型缓蚀剂。XPS测试表明,UHCI吸附在金属表面形成保护膜,有效阻碍腐蚀介质向金属表面扩散,从而达到缓蚀效果。量子化学计算结果表明,UHCI分子在与金属作用时,主要是羧甲基和咪唑环吸附在金属表面,从而降低腐蚀速率。
The effects of 2-undecyl-N-carboxymethyl-N-hydroxyethyl imidazoline (UHCI) on the performance of 20 # carbon steel in simulating desalination of seawater by reverse osmosis were studied by weight loss method, electrochemical method, XPS and SEM. Corrosion in water. The results show that UHCI has a corrosion inhibition effect on 20 # carbon steel. With the increase of UHCl concentration, the corrosion inhibition efficiency obviously increases. UHCI reduces the anode current density of the carbon steel electrode and is an anode type corrosion inhibitor. XPS test shows that UHCI adsorbed on the metal surface to form a protective film, effectively hinder the diffusion of corrosive medium to the metal surface, so as to achieve the corrosion inhibition effect. Quantum chemical calculation results show that, when interacting with metal, UHCI molecules mainly adsorb on the metal surface by carboxymethyl and imidazole rings, thus reducing the corrosion rate.