Effect of Rare Earth Element La Addition on the Corrosion Resistance of 90/10 Copper–Nickel Alloy
Year: 2026
Type: article
Abstract: The corrosion behavior of 90/10 copper-nickel alloy with different rare earth La contents in 3.5 wt.% NaCl solution was investigated by EIS and polarization tests. The corrosion product films were characterized using SEM, EDS, and XRD, and the corrosion products on the sample surface were further analyzed using XPS to investigate the detailed layer structure. The results demonstrate that rare earth La enhances the corrosion resistance of 90/10 copper-nickel alloy in a 3.5 wt.% NaCl solution, with its effect becoming more pronounced as the immersion time increases to 30 days. The corrosion resistance of the alloys increased initially and then decreased with increasing rare earth content, with the optimal corrosion resistance observed at 0.063 wt.% rare earth La. Rare earth La can effectively improve the binding force and stability of the corrosion product film on the surface of 90/10 copper-nickel alloy with the substrate and reduce the generation of cracks in the corrosion products. XPS results indicate that the Ni content in the corrosion product film of 90/10 copper-nickel alloy with rare earth La added is higher. The La2O3 formed in the corrosion product inhibits the cathodic reaction and enhances the dielectric properties of the surface film, thereby improving the corrosion resistance of 90/10 copper-nickel alloy.
Source: Advanced Engineering Materials
Authors: Shuhao Li, Xiang Leng, Zhiyun Zhu
Institution: Jiangxi University of Science and Technology
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7142896470