Intergranular corrosion mechanism of AlCu alloy: Model and experimental validation

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2025-02-08 DOI:10.1016/j.matchar.2025.114823

Le Ren , Changhao Liu , Yating Zhang , Shangkun Shen , Di Zhang , Xinfang Zhang

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Abstract

Intergranular corrosion poses a serious threat to equipment safety and causes significant economic losses. In this study, a theoretical model was established to quantitatively determine the relationship between intergranular corrosion sensitivity and grain boundary segregation behavior of aluminum alloys. The model took into account the solute depletion width of the anode and potential difference between the matrix and solute depletion zone. First, the impact of solute depletion regions with varying dimensions on current distribution was investigated through Laplace equation. The findings indicated that the maximum corrosion current in the vicinity of the anode exhibited a notable decline with an increase of anode size, whereas the current density in the proximity of the cathode remained largely unaltered. Subsequently, the Butler-Volmer equation of the cathode was correlated with the solute depletion zone width of the anode by using charge conservation as a bridge. The model demonstrated that the intergranular corrosion sensitivity exhibited a decline in correlation with both an increase of solute depletion zone width and a reduction of potential difference. Taken Al4Cu as a model alloy, the intergranular corrosion sensitivity factor calculated by this model could effectively predict the intergranular corrosion depth, thereby providing a new avenue for the study of intergranular corrosion behavior of aluminum alloys.

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.