Ar+ irradiation improves passivation of molybdenum in aqueous solution

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-02 DOI:10.1016/j.corsci.2025.113288

Wande Cairang , Fuzhu Liu , Tianshu Li , Zhicheng Zhang , Jian Zhang , Weiyue Zhou , Yuqing Zhou , Tao Li , Michael P. Short , Dezhen Xue , Xiangdong Ding , Jun Sun

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引用次数: 0

Abstract

Long-term oxidation of metals is often accelerated by simultaneous ionizing irradiation. However, this may not always be the case in the early phase of oxide formation, particularly in an aqueous environment. In this study, we observed that Ar⁺ irradiation enhances molybdenum (Mo) passivation in an aerated 3.5 wt% NaCl solution, slowing further corrosion of Mo. This enhancement of passivation was confirmed by electrochemical measurements, where the potentiodynamic polarization curve for irradiated Mo exhibited well-defined passivation region, in contrast to the dissolution-like behavior observed in non-irradiated Mo. Characterization of the oxide revealed a thin (tens of nanometers), uniform passive film on irradiated Mo, compared to a micron-thick, non-uniform oxide formed on non-irradiated Mo. We attribute this irradiation-enhanced passivation to the irradiation-induced defects near or on the surface, which provide excess nucleation sites for oxide and promote rapid initial oxide formation, thereby leading to a more protective passive film that mitigates further oxidation. Both experiments and DFT calculations confirm that oxygen adsorbs more strongly to the surface of Mo after Ar⁺ irradiation, indicating its enhanced oxidation tendency. These findings provide valuable insights into the effects of irradiation on passivation of metals, particularly those that do not naturally exhibit strong passivation.

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Ar+辐照改善了钼在水溶液中的钝化

金属的长期氧化常因同时电离照射而加速。然而，在氧化物形成的早期阶段，特别是在水环境中，情况可能并不总是如此。在这项研究中，我们观察到Ar+辐照增强了3.5 wt% NaCl曝气溶液中钼（Mo）的钝化，减缓了钼的进一步腐蚀。电化学测量证实了这种钝化的增强，与未辐照的钼的溶解行为相反，辐照后的钼的动电位极化曲线显示出明确的钝化区域。与未辐照Mo上形成的微米厚的不均匀氧化物相比，辐照Mo上形成了均匀的钝化膜。我们将这种辐照增强的钝化归因于辐照诱导的表面附近或表面缺陷，这些缺陷为氧化物提供了多余的成核位点，促进了快速的初始氧化物形成，从而导致更具保护性的钝化膜，从而减轻了进一步的氧化。实验和DFT计算都证实了Ar +辐照后氧在Mo表面的吸附更强，表明其氧化倾向增强。这些发现为辐照对金属钝化的影响提供了有价值的见解，特别是那些不自然表现出强烈钝化的金属。

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

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.