湿热海洋大气环境中7075铝合金的多阶段点蚀演化及改进Weibull损伤动力学分析

刘治国; 孙成龙; 孙德海; 侯旺; 吴娜娜

doi:10.7643/ issn.1672-9242.2026.02.012

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装备环境工程 ›› 2026, Vol. 23 ›› Issue (2) : 103-113. DOI: 10.7643/ issn.1672-9242.2026.02.012

船舶及海洋工程装备

湿热海洋大气环境中7075铝合金的多阶段点蚀演化及改进Weibull损伤动力学分析

刘治国¹, 孙成龙^1,2, 孙德海³, 侯旺⁴, 吴娜娜⁵

作者信息 +

Multi-stage Pitting Evolution of 7075 Aluminum Alloy in a Hot-humid Marine Atmosphere and Analysis Using an Improved Weibull Damage Kinetics Model

LIU Zhiguo¹, SUN Chenglong^1,2, SUN Dehai³, HOU Wang⁴, WU Nana⁵

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文章历史 +

摘要

目的揭示7075铝合金在湿热海洋大气环境中腐蚀坑的跨阶段演化机制,建立腐蚀损伤动力学预测模型。方法设计并实施模拟南海环境的循环加速腐蚀试验方案,通过交替浸渍法实现加速腐蚀过程。采用超景深三维显微镜获取在不同等效服役年限（3~13 a）下腐蚀坑的投影面积、深度及体积等三维形貌参数。在此基础上,提出并应用改进的Weibull动力学模型,以分阶段拟合腐蚀演化规律。结果腐蚀坑演化呈现三阶段特征,初期（3~7 a）以纵深发展为主,其深径比约为1.3,深度年均增速4.8 μm;中期（7~11 a）自催化效应驱动面积快速增长,年均增速达3.4×10⁴ μm²,深径比降约1.0;后期（11~13 a）由于腐蚀产物累积并形成碗状沉积形貌,坑体横向扩展受限,深径比进一步下降至约为0.8。改进后的 Weibull 动力学模型能够精确描述各阶段的动力学行为与转变节点。结论 7075 铝合金腐蚀坑由纵深优先向横向扩展的阶段性转变,主要由钝化膜反复破裂与随后发生的自催化腐蚀过程所调控。所建立的“腐蚀三维形貌-动力学”关联机制为高强度铝合金在海洋服役环境下的寿命预测与临界损伤评估提供了理论依据与定量工具。

Abstract

The work aims to reveal the multi-stage evolutionof corrosion pits on 7075aluminum alloy subjectto a hot and humid Marine atmospheric environment and establish a dynamic prediction model for corrosion damage. A cyclic accelerated corrosion test scheme simulating the South China Sea environment was designed and implemented, and the corrosion process was accelerated through the alternating impregnation method. The three-dimensional topography parameters such as the projected area, depth and volume of corrosion pits under different equivalent service lives (3 to 13 years) were obtained with a super-depth-of-field three-dimensional microscope. On this basis, a modified Weibull dynamic model was proposed and applied to fit the corrosion evolution law in stages.The results delineated a clear triphasic evolution mechanism. Theinitial stage (3-7 years) was dominated by pit deepening, with an average annual depth increase of 4.8 μm and a high aspect ratio of 1.3. Theintermediate stage (7-11 years)witnessed a paradigm shift to accelerated lateral expansion, governed by autocatalytic effects within the pit. The pit area growth rate surged to an annual average of 3.4×10⁴ μm², and the morphology transitioned from narrow-deep to a near-spherical shape (aspect ratio ≈1.0). In thelate stage (11-13 years), growth saturation occurred due to the physical blockage by accumulated corrosion products, resulting in a bowl-shaped morphology (aspect ratio≈0.8).Themodified Weibull model canaccurately describe the dynamic behavior and transition nodes at each stage. The phased transformation of the corrosion pit on 7075 aluminum alloy from deepening to lateral expansion is mainly regulated by the repeated cracking of the passivation film and the subsequent autocatalytic corrosion process. The established “three-dimensional morphology of corrosion-dynamics” correlation mechanism provides a theoretical basis and quantitative tool for the life prediction and critical damage assessment of high-strength aluminum alloy serving in marine environments.

导出引用

刘治国, 孙成龙, 孙德海, 侯旺, 吴娜娜. 湿热海洋大气环境中7075铝合金的多阶段点蚀演化及改进Weibull损伤动力学分析[J]. 装备环境工程. 2026, 23(2): 103-113 https://doi.org/10.7643/ issn.1672-9242.2026.02.012

LIU Zhiguo, SUN Chenglong, SUN Dehai, HOU Wang, WU Nana. Multi-stage Pitting Evolution of 7075 Aluminum Alloy in a Hot-humid Marine Atmosphere and Analysis Using an Improved Weibull Damage Kinetics Model[J]. Equipment Environmental Engineering. 2026, 23(2): 103-113 https://doi.org/10.7643/ issn.1672-9242.2026.02.012

中图分类号： TG172.3

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