Unraveling the role of tensile stress in corrosion and the formation of oxide films on sensitized Al-Mg alloys

IF 7.4 1区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yuanyuan Ji , Chengcheng Pan , Mingyang Wang , Yashar Behnamian , Dongdong Zhao , Wenbin Hu , Da-Hai Xia , Bernard Tribollet
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引用次数: 0

Abstract

Intergranular corrosion (IGC) significantly damages the strength of Al-Mg alloys with a Mg content > 3 wt% when these alloys are serviced in marine environments. Although a dense oxide film can prevent the degradation of Al alloys, the influence of tensile stress on the properties of the oxide film is unclear. Here, the oxide films formed on a sensitized 5083 Al-Mg alloy under constant elastic and plastic tensile stresses are investigated. Pitting corrosion and intergranular corrosion occurred on the alloy surface. Tensile stress accelerated the anodic dissolution on the alloy surface and promoted intergranular corrosion, weakening the corrosion resistance of the oxide film. A heterogeneous oxide film was found on sensitized Al-Mg alloy, with the oxide film formed on the IGC region was thicker than that on the alloy matrix due to local alkalization. Tensile stress caused dislocations near the grain boundaries, but did not change the composition of the oxide film in the region subjected to intergranular corrosion. Density-functional theory calculations suggest that tensile stress destroyed the oxide film and weakened the electronic interactions between the oxide film and the alloy matrix, fostering the propagation of intergranular corrosion. Our findings clarify the mechanisms of oxide film formation on Al-Mg alloys under constant tensile stress in aqueous solution.
揭示了拉应力在敏化铝镁合金腐蚀和氧化膜形成中的作用
当镁含量为>; 3 wt%的Al-Mg合金在海洋环境中服役时,晶间腐蚀(IGC)显著地破坏了合金的强度。虽然致密的氧化膜可以防止铝合金的退化,但拉伸应力对氧化膜性能的影响尚不清楚。本文研究了在恒定弹性和塑性拉伸应力下敏化5083铝镁合金上形成的氧化膜。合金表面出现点蚀和晶间腐蚀。拉伸应力加速了合金表面的阳极溶解,促进了晶间腐蚀,削弱了氧化膜的耐蚀性。在敏化的Al-Mg合金上发现了一层非均相氧化膜,由于局部碱化作用,在IGC区形成的氧化膜比合金基体上的氧化膜厚。拉伸应力引起了晶界附近的位错,但没有改变晶间腐蚀区域氧化膜的成分。密度泛函理论计算表明,拉伸应力破坏了氧化膜,削弱了氧化膜与合金基体之间的电子相互作用,促进了晶间腐蚀的扩展。本研究结果阐明了Al-Mg合金在恒定拉伸应力下在水溶液中形成氧化膜的机理。
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
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.
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