How crystallographic orientation affects aqueous corrosion of dilute Mg-alloys

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

Corrosion Science Pub Date : 2025-06-26 DOI:10.1016/j.corsci.2025.113151

Li Wang , Youhong Peng , Taiki Nakata , Chao Xu , Jun Sun , Zhen Zheng , Yang Li , Fuyong Cao , Lin Geng , Shigeharu Kamado

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引用次数: 0

Abstract

Crystallographic orientation significantly impacts the corrosion behavior of magnesium alloys. Previous research primarily focused on its influence on two-dimensional, static surface corrosion, neglecting the evolution of corrosion behavior from the surface to the interior. Therefore, three-dimensional (3D) and dynamic observations are essential to comprehensively understand the underlying mechanism. Using Mg-0.6Al-0.2Ca-0.3Mn (wt.%) (AXM) as a model alloy, we investigated the effect of crystallographic orientation on corrosion in a 3.5 wt.% NaCl solution across temporal and spatial scales by combining laboratory-based diffraction contrast tomography (Lab-DCT), and quasi in-situ computed tomography (CT). During early immersion, basal-oriented planes, influenced by the galvanic effect of the second-phase particles and non-basal-oriented planes, exhibited greater susceptibility to local corrosion, which then propagated towards adjacent near-basal-oriented planes. The loose, porous corrosion product film formed on basal-oriented grains facilitated deeper corrosion penetration over time, extending to surrounding grains with similar orientations. Prolonged immersion resulted in a higher corrosion volume percentage within basal-oriented grains. These findings underscore the crucial role of crystallographic orientation in controlling localized corrosion behavior, providing valuable theoretical insights for enhancing the corrosion resistance of magnesium alloys through crystallographic orientation distribution control.

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晶体取向如何影响稀镁合金的水腐蚀

晶体取向对镁合金的腐蚀行为有显著影响。以往的研究主要集中在其对二维静态表面腐蚀的影响上，忽略了从表面到内部腐蚀行为的演变。因此，三维（3D）和动态观测对于全面了解其潜在机制至关重要。以Mg-0.6Al-0.2Ca-0.3Mn (wt.%) （AXM）为模型合金，研究了晶体取向对3.5 wt腐蚀的影响。通过结合基于实验室的衍射对比断层扫描（Lab-DCT）和准原位计算机断层扫描（CT），在时间和空间尺度上研究了% NaCl溶液。在早期浸泡过程中，基底取向面受第二相颗粒和非基底取向面的电偶效应的影响，对局部腐蚀表现出更大的敏感性，然后向邻近的近基底取向面扩散。随着时间的推移，基底取向晶粒上形成的疏松多孔腐蚀产物膜有利于更深的腐蚀渗透，并延伸到周围类似取向的晶粒。长时间浸泡导致基底取向晶粒内部的腐蚀体积百分比增大。这些发现强调了晶体取向在控制局部腐蚀行为中的重要作用，为通过控制晶体取向分布来提高镁合金的耐腐蚀性提供了有价值的理论见解。

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

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.