Microstructure evolution and enhanced mechanical performance of CrAlN and CrAlON coatings subjected to exposure in tropical marine environment

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-09-25 DOI:10.1016/j.vacuum.2025.114777

Dongpo Xu , Wenhao Zhao , Dali Du , Zhenrong Gao , Na Wang , Zhen Cao , Jinlong Li

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引用次数: 0

Abstract

CrAlN and CrAlON coatings were deposited on high-strength bolts by multi-arc ion plating. The coated bolts were subjected to one year of natural exposure in a tropical marine environment. After one year of exposure in a tropical marine environment, the CrAlN coating exhibits extensive corrosion pits and pronounced grain boundary cracks. In contrast, the CrAlON coating demonstrates superior corrosion resistance, characterized by a dense surface morphology, refined grains, and the absence of observable cracks. These microstructural characteristics inhibit the ingress of corrosive species and confer environmental adaptability on the CrAlON coating. Furthermore, the CrAlON coating retains high hardness and elevated H/E (0.082) and H³/E*² (0.208) values, indicating superior load-bearing capacity. Its wear rate decreases from 18.43 × 10⁻⁷ mm³ N⁻¹ m⁻¹ to 9.98 × 10⁻⁷ mm³ N⁻¹ m⁻¹ after exposure, reflecting outstanding wear resistance. These findings provide important insights into the development of durable, multifunctional coatings for high-strength bolts in tropical marine environment.

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热带海洋环境下CrAlN和CrAlON涂层的微观结构演变及力学性能增强

采用多弧离子镀技术在高强度螺栓表面沉积CrAlN和CrAlON涂层。涂有涂层的螺栓在热带海洋环境中自然暴露一年。在热带海洋环境中暴露一年后，CrAlN涂层呈现出广泛的腐蚀坑和明显的晶界裂纹。相比之下，CrAlON涂层表现出优异的耐腐蚀性，其特点是表面形貌致密，晶粒细，没有可观察到的裂纹。这些微观结构特征抑制了腐蚀性物质的进入，赋予了CrAlON涂层环境适应性。此外，CrAlON涂层保持了较高的硬度和较高的H/E（0.082）和H3/E*2（0.208）值，表明具有优越的承载能力。暴露后，其磨损率由18.43 × 10−7 mm3 N−1 m−1降至9.98 × 10−7 mm3 N−1 m−1，具有良好的耐磨性。这些发现为开发用于热带海洋环境中高强度螺栓的耐用、多功能涂层提供了重要见解。

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

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.