Unveiling the influence of zirconium on the corrosion behavior of Fe-36Ni Invar alloy

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-10-02 DOI:10.1016/j.intermet.2024.108519

Qi Wang , Yanwu Dong , Zhouhua Jiang , Zilin Yin , Yuning Wu , Haibiao Qing

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Abstract

The influence of zirconium (Zr) on the corrosion resistance of Fe-36Ni Invar alloy in a 3.5 wt% NaCl solution was systematically investigated. Results indicated that adding Zr promoted the formation of Zr-bearing intermetallic compounds (Ni₇Zr₂ and Ni₂Zr). The phases suppressed the grain growth and numerous dislocations were enriched around the Ni-Zr phases. Unfortunately, the incorporation of Zr into Fe-36Ni Invar alloy impaired corrosion resistance. The marked disparity in Volta potential between the Ni-Zr phases and the matrix signified the existence of micro-galvanic coupling, which caused the matrix to dissolve preferentially. Furthermore, the matrix around the Ni-Zr phases possessed high dislocation density, promoting the emergence of local galvanic corrosion. The introduction of Zr also decreased the protectiveness of the passive film, which was ascribed to the reduction of the thickness of the passive film and the beneficial oxide content in the passive film.

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揭示锆对 Fe-36Ni 英达合金腐蚀行为的影响

系统研究了锆 (Zr) 在 3.5 wt% 的 NaCl 溶液中对 Fe-36Ni 英达合金耐腐蚀性的影响。结果表明，锆的加入促进了含锆金属间化合物（Ni7Zr2 和 Ni2Zr）的形成。这些相抑制了晶粒的生长，并在 Ni-Zr 相周围富集了大量位错。遗憾的是，在 Fe-36Ni 英达合金中掺入 Zr 会影响耐腐蚀性。Ni-Zr 相与基体之间的伏特电位存在明显差异，这表明存在微电镀耦合，导致基体优先溶解。此外，Ni-Zr 相周围的基体具有较高的位错密度，促进了局部电化学腐蚀的出现。Zr 的引入也降低了被动膜的保护性，这归因于被动膜厚度的减少和被动膜中有益氧化物含量的降低。

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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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.