Purpose

This study aims to investigate the effect of changes in iron content in 70/30 copper–nickel alloy on the corrosion process.

Design/methodology/approach

70Copper–30Nickel-xFe-1Mn (x = 0.4,0.6,0.8,1.0 Wt.%) alloy were prepared by the high frequency induction melting furnace. The scanning electron microscope, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy were used to analyze the morphology and component of the corrosion product film.

Findings

The results show that the corrosion resistance of 70/30 copper–nickel alloy added with 1.0%Fe is the best, and the film is divided into inner dense Cu2O composite film and outer hydration loose layer; XRD showed that after adding 1.0% Fe, the content of Cu2(OH)3Cl in the corrosion product film was significantly reduced, while the content of Cu2O remained unchanged; XPS showed that nickel accumulates in the inner layer of corrosion product film; the stage growth mode of the film, the role of nickel in it and the enrichment mechanism of iron in the inner film were summarized and discussed.

Originality/value

The changes in the composition and structure of the corrosion product film caused by the iron content are revealed, and the mechanism of the difference in corrosion resistance is discussed.

中文翻译：

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铁对70/30铜镍合金中腐蚀产物膜成分和结构的影响

目的

本研究旨在调查70/30铜镍合金中铁含量的变化对腐蚀过程的影响。

设计/方法/方法

用高频感应熔炼炉制备了70铜–30镍-xFe-1Mn（x = 0.4,0.6,0.8,1.0 Wt。％）合金。使用扫描电子显微镜，X射线衍射（XRD），X射线光电子能谱（XPS）和电化学阻抗谱来分析腐蚀产物膜的形态和成分。

发现

结果表明，添加1.0％Fe的70/30铜镍合金的耐蚀性最好，该膜分为内致密Cu2O复合膜和外水合疏松层。XRD分析表明，添加1.0％的Fe后，腐蚀产物膜中Cu2（OH）3Cl的含量明显降低，而Cu2O的含量保持不变。XPS表明镍积聚在腐蚀产物膜的内层中。总结并讨论了膜的阶段生长方式，镍在膜中的作用以及铁在膜内部的富集机理。

创意/价值

揭示了由铁含量引起的腐蚀产物膜组成和结构的变化，并探讨了耐蚀性差异的机理。