Abstract It has been established that the corrosion of mild steel in Ethaline and Reline (choline chloride based deep eutectic solvents with the ethylene glycol and urea respectively) occurs with oxygen depolarization. The rate of corrosion is significantly affected by the contact time of solvents with air and temperature. These two factors determine the physicochemical properties and play a decisive role in the rate of diffusion of the depolarizer, and hence the corrosion rate. It is shown that both solvents are hygroscopic (for 160 h of contact with air in Ethaline 15 vol% of water is detected, in Reline about 7 vol%). It is noted that the rate of corrosion of mild steel in Ethaline is noticeably higher than in Reline. However, when operating temperatures of solvents becomes ≈70 ÷ 80 °C the corrosion rates in Ethaline and Reline is very close to each other, which is primarily due to the convergence of the viscosity parameters. SEM studies of the surface of the steel samples showed that in Ethaline and Reline solvents corrosion occurs with the formation of pitting and elements of subsurface corrosion. The mechanism of corrosion is established and the essential role of chloride anions in the formation of intermediate corrosion products is shown.

中文翻译：

---

新型离子液体中低碳钢腐蚀动力学及机理

摘要 已经确定，软钢在 Ethaline 和 Reline（分别与乙二醇和尿素的氯化胆碱基深共熔溶剂）中的腐蚀伴随着氧去极化发生。腐蚀速率受溶剂与空气的接触时间和温度的显着影响。这两个因素决定了物理化学性质，并对消偏器的扩散速率和腐蚀速率起着决定性作用。结果表明，两种溶剂都具有吸湿性（在 Ethaline 中与空气接触 160 小时，检测到 15 vol% 的水，在 Reline 中为约 7 vol%）。值得注意的是，Ethaline 中低碳钢的腐蚀速率明显高于 Reline。然而，当溶剂的操作温度变为 ≈70 ÷ 80 °C 时，Ethaline 和 Reline 的腐蚀速率非常接近，这主要是由于粘度参数的收敛。钢样品表面的 SEM 研究表明，在 Ethaline 和 Reline 溶剂中，腐蚀会随着点蚀和亚表面腐蚀元素的形成而发生。建立了腐蚀机制，并显示了氯阴离子在中间腐蚀产物形成中的重要作用。