Understanding the formation and vulnerability of passive films on magnesium alloy surface in Portland cement paste

IF 3.8 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2024-09-04 DOI:10.1016/j.vacuum.2024.113618

引用次数: 0

Abstract

The formation and destruction of the passivation film on AZ41 Mg alloy embedded in Portland cement paste were investigated via electrochemical methods and surface characterizations. Results indicate a thin but dense passivation film can be formed on the Mg alloy surface, while a distinctive sandwich-like structure of passivation film is observed on the Al-Mn phase. However, Cl⁻ ions could lead to the destruction of the passivation film, resulting in the formation of a corrosion product layer even in the alkaline environment. Moreover, corrosion resistance of AZ41 Mg alloy embedded in Portland cement paste improves over time, while the introduction of chloride ions triggers a decline in corrosion resistance.

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了解波特兰水泥浆中镁合金表面被动膜的形成和脆弱性

通过电化学方法和表面特性分析，研究了硅酸盐水泥浆中嵌入的 AZ41 Mg 合金上钝化膜的形成和破坏情况。结果表明，在镁合金表面可以形成一层薄而致密的钝化膜，而在铝锰相上可以观察到明显的钝化膜三明治结构。然而，Cl- 离子会破坏钝化膜，导致即使在碱性环境中也会形成腐蚀产物层。此外，硅酸盐水泥浆中嵌入的 AZ41 Mg 合金的耐腐蚀性能随着时间的推移而提高，而氯离子的引入会导致耐腐蚀性能下降。

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.