Inhibitory effect of cysteine and lanthanides on AA7075‐T6 in neutral NaCl solution

Materials and Corrosion Pub Date : 2022-11-01 DOI:10.1002/maco.202213330

Jovana Pejić, Bojana M. Radojković, Dunja Marunkić, B. Jegdić, S. Stevanović, Milena Milošević, J. Bajat

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引用次数: 2

Abstract

The inhibitory effect of cysteine in the presence of selected lanthanide chlorides (LaCl3, NdCl3, and CeCl3) in a neutral 0.1 M NaCl solution was analyzed. The cysteine concentration of 0.3 mM was determined as an optimal one. The resistance to general and pitting corrosion of AA7075‐T6 alloy in inhibitive solutions was determined using electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The surface appearance of the aluminum alloy was determined before and after corrosion tests using scanning electron microscopy/energy dispersive spectroscopy, while the presence of an inhibitory layer on the alloy surface was confirmed by X‐ray photoelectron spectroscopy analysis and atomic force microscopy. The inhibitory effect of cysteine was significantly higher in the presence of all tested lanthanide chlorides, especially to pitting corrosion. The protective ability of cysteine was increased by lanthanides in the following sequence: Ln < Nd < Ce ions. The inhibitory effect of cysteine in the presence of cerium ions was examined in more detail as cerium ions provided the highest inhibitory effect, both to general and pitting corrosion.

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半胱氨酸和镧系元素对中性NaCl溶液中AA7075‐T6的抑制作用

分析了在中性0.1 M NaCl溶液中，选择镧系氯化物(LaCl3、NdCl3和CeCl3)存在时，半胱氨酸的抑制作用。半胱氨酸的最佳浓度为0.3 mM。采用电化学阻抗谱法和动电位极化法测定了AA7075‐T6合金在缓蚀剂溶液中的抗一般腐蚀和点蚀性能。采用扫描电镜/能量色散光谱法测定了腐蚀前后铝合金的表面形貌，同时通过X射线光电子能谱分析和原子力显微镜法证实了合金表面存在抑制层。在所有被测镧系氯化物存在的情况下，半胱氨酸的抑制作用明显更高，尤其是对点蚀的抑制作用。镧系元素对半胱氨酸的保护能力增强的顺序为:Ln < Nd < Ce。对于半胱氨酸在铈离子存在下的抑制作用进行了更详细的研究，因为铈离子对一般腐蚀和点蚀都具有最高的抑制作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Materials and Corrosion

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