Improved corrosion resistance of carbon steel in soft water with dendritic-polymer corrosion inhibitors
Improved corrosion resistance of carbon steel in soft water with dendritic-polymer corrosion inhibitors
复制标题
使用树枝状聚合物缓蚀剂提高碳钢在软水中的耐腐蚀性
DOI：
10.1016/j.cej.2022.139043
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发表时间：
2022-09-18
影响因子：
15.1
通讯作者：
Li, Chunjiang
中科院分区：
文献类型：
--
作者：
Zheng, Haibin;Zhang, Bingru;Li, Chunjiang
研究了具有异硫醚端基、羧基侧基和第0代和第1代戊糖醇核树枝状聚合物（ITCP-0 G和ITCP-1G）作为碳钢在软水中的新型无磷缓蚀剂。失重法、Tafel极化曲线和电化学阻抗谱分析结果表明，ITCP-0 G和ITCP-1G对碳钢在软水中的缓蚀性能远高于已报道的缓蚀剂，而ITCP-1G的缓蚀性能上级优于ITCP-0 G。当ITCP-1G的浓度为15 mg.L-1时，缓蚀效率达到97.62%，高于ITCP-0 G的75.19%。Langmuir吸附等温线模型表明ITCP-1G在碳钢表面的自发吸附。综合表面分析表明，ITCP分子末端异硫键中的S和N与铁结合，在钢表面形成保护膜。增加树枝状大分子中末端异硫杂环戊烯基的数目，导致与铁离子的结合力更强，并且在钢表面形成更强的保护膜。此外，较大的树枝状聚合物分子在钢表面上提供更好的保护膜的表面覆盖和更好的腐蚀抑制性能。因此，ITCP-1G比ITCP-0 G具有更强的防止碳钢对铁的阳极腐蚀的能力。本研究为缓蚀剂在软水中的缓蚀机理研究以及新型软水缓蚀剂的开发提供了新的思路。
Dendritic polymers with an isothiourea terminal group, carboxyl lateral group, and pentitol core dendrimers with 0 and 1 generations (ITCP-0G and ITCP-1G) were developed as novel phosphorus-free corrosion inhibitors for carbon steel in soft water. The results of weight loss, Tafel polarization, and electrochemical impedance spectroscopy analyses showed that the corrosion inhibition performance of ITCP-0G and ITCP-1G of carbon steel in soft water was much higher than that of the previously reported corrosion inhibitors, whereas the performance of ITCP-1G is superior to that of ITCP-0G. An ITCP-1G concentration of 15 mg.L-1 achieved a corrosion inhibition efficiency of 97.62 %, which is higher than the value of 75.19 % achieved by ITCP-0G. The Langmuir adsorption isotherm model indicated spontaneous adsorption of ITCP-1G on the carbon steel surface. Comprehensive surface analysis indicated that S and N in the terminal isothiourea of ITCP molecules bind with iron to form a protective film on the steel surface. Increasing the number of terminal isothiourea groups in the dendrimers results in a stronger binding force with Fe ions, and a stronger protective film is formed on the steel surface. Additionally, larger dendrimer molecules provide better surface coverage of the protective film on the steel surface and better corrosion inhibition performance. Therefore, ITCP-1G had a stronger ability to prevent the anodic corrosion of iron from carbon steel than ITCP-0G. This work will provide new insights into the corrosion inhibition mechanism of corrosion inhibitors in soft water as well as the development of new types of water-softening corrosion inhibitors.