Purpose

This study aims to investigate the effect of coatings prepared by the addition of copper-aluminum alloy powder on the corrosion behavior of 90/10 copper-nickel alloy.

Design/methodology/approach

Coatings of copper-aluminum alloy powder at different contents (Wt.% = 50%, 60%, 70% and 80%) were prepared by the high-temperature heat treatment process. The microstructure and component of the coatings were characterized by scanning electron microscope, X-ray diffraction, energy dispersive spectrometer and X-ray photoelectron spectroscopy. The electrochemical properties of the coating were explored by electrochemical impedance spectroscopy.

Findings

The results show that the aluminized layer was successfully constructed on the surface of 90/10 copper-nickel alloy, the composition of the coating was composed of copper-aluminum phase and aluminum-nickel phase, the existence of the aluminum-nickel phase was formed by the diffusion of Ni elements within the substrate and because of the diffusion, the Al-Ni phase was distributed in the middle and bottom of the coating more. The Al-Ni phase is considered to be the enhanced phase for corrosion resistance. When the copper-aluminum alloy powder content is 70 Wt.%, the corrosion resistance is the best.

Originality/value

The enhancement of corrosion resistance of 90/10 copper-nickel alloy by the copper-aluminum alloy powder was revealed, the composition of the aluminized layer and the mechanism of corrosion resistance were discussed.

中文翻译：

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高温渗铝处理对90/10铜镍合金耐蚀性的影响

目的

本研究旨在研究添加铜铝合金粉末制备的涂层对90/10铜镍合金腐蚀行为的影响。

设计/方法/方法

通过高温热处理工艺制备了不同含量（Wt.% = 50%、60%、70%和80%）的铜铝合金粉末涂层。通过扫描电子显微镜、X射线衍射、能谱仪和X射线光电子能谱对涂层的微观结构和成分进行了表征。通过电化学阻抗谱研究了涂层的电化学性能。

发现

结果表明，在90/10铜镍合金表面成功构建了镀铝层，镀层成分由铜铝相和铝镍相组成，形成了铝镍相的存在由于Ni元素在基体内部的扩散和扩散，Al-Ni相更多地分布在涂层的中部和底部。Al-Ni 相被认为是增强耐腐蚀性的相。当铜铝合金粉末含量为70 Wt.%时，耐腐蚀性能最好。

原创性/价值

揭示了铜铝合金粉对90/10铜镍合金耐蚀性的增强作用，讨论了镀铝层的成分和耐蚀性机理。