A novel antioxidant strategy for low Al-containing Ni-Al alloys by deposition of a Cr precursor film

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-09-18 DOI:10.1016/j.surfcoat.2025.132689

Hang Ding , Jun Ye , Xun He , Song Tang , Yun Xie , Xiaoyong Shu , Xiao Peng

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引用次数: 0

Abstract

Based on classical Wagner's criteria, Ni-Al alloys are unable to establish a protective alumina scale if their Al concentration is lower than the critical value required (

N_{Al}^{(1)}

) for external alumina scale formation. However, this study presented that depositing a thin metallic Cr film on Ni-16Al alloy with a subcritical Al concentration promoted the transition from internal to external Al₂O₃ oxidation, converting the alloy from a NiO-former to an Al₂O₃-former and reducing oxidation rate by 80 %. More importantly, the newly grown Al₂O₃ layer was in stable alpha phase, providing better protection than the predominant metastable-Al₂O₃ layer formed by bare Ni-22Al alloy. This provides a novel strategy for designing advanced structural alloys with good combination of oxidation resistance and mechanical properties.

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沉积Cr前驱体膜制备低铝镍铝合金抗氧化新策略

根据经典的Wagner标准，如果Ni-Al合金的Al浓度低于形成外部氧化铝结垢所需的临界值（NAl1），则Ni-Al合金无法建立保护性氧化铝结垢。然而，本研究表明，在亚临界Al浓度的Ni-16Al合金上沉积一层薄金属Cr膜，促进了合金由内部Al2O3氧化向外部Al2O3氧化的转变，使合金由NiO-former转变为Al2O3-former，氧化率降低了80%。更重要的是，新生长的Al2O3层处于稳定的α相，比裸露Ni-22Al合金形成的亚稳Al2O3层具有更好的保护作用。这为设计具有良好的抗氧化性能和力学性能的高级结构合金提供了一种新的策略。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.