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（英文）

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.

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。