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Synergistic corrosion inhibition behavior of rare-earth cerium ions and serine on carbon steel in 3% NaCl solutions

稀土铈离子和丝氨酸对碳钢的缓蚀协同作用研究

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Abstract

The synergistic inhibition effect of CeCl3 (Ce) and serine (Ser) on the corrosion of carbon steel in a 3% NaCl solution was investigated by electrochemical methods and surface analysis. The results showed that both CeCl3 and Ser, when used alone, had limited inhibition effect toward carbon steel corrosion in the 3% NaCl solution. In contrast, the combination of CeCl3 with Ser produced a strong synergistic effect on the corrosion inhibition behavior of carbon steel, improving the inhibition efficiency significantly. The polarization curves showed that the mixture of CeCl3 and Ser acts as a cationic-type inhibitor. Scanning electron microscopy and Fourier transform infrared spectroscopy showed that the synergistic inhibition effect was due to complex formation between the cerium ions and amino acid molecules.

摘要

本文通过电化学和表面分析方法研究了稀土铈离子和丝氨酸在3%氯化钠溶液中对碳钢的缓蚀 协同作用。研究结果表明, 单独的铈离子或丝氨酸在3%氯化钠中对碳钢的腐蚀抑制作用均有限,相 比之下,铈离子与丝氨酸复配之后,稀土缓蚀剂的缓蚀性能显著增强,即稀土铈离子与丝基酸之间存 在缓蚀协同效应。扫描电子显微镜和傅里叶红外反射光谱表明,稀土铈离子和丝基酸在金属表面形成 了稀土离子—氨基酸的配合物薄膜,阻碍了阴极腐蚀过程,从而有效地抑制了金属腐蚀。

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Correspondence to Xia Liu  (刘瑕) or Yu-gui Zheng  (郑玉贵).

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Foundation item: Project(2017210101002066) supported by the Crosswise Project of Liaoning province, China

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Liu, X., Yuan, Yz., Wu, Zy. et al. Synergistic corrosion inhibition behavior of rare-earth cerium ions and serine on carbon steel in 3% NaCl solutions. J. Cent. South Univ. 25, 1914–1919 (2018). https://doi.org/10.1007/s11771-018-3881-x

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  • DOI: https://doi.org/10.1007/s11771-018-3881-x

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