Hydrogen trapping is one of the factors leading to hydrogen embrittlement in heat-treatable high-strength aluminum alloys. The effect of coherency of precipitates on the corrosion-induced hydrogen trapping in aluminum alloy 2024 was investigated by performing artificial aging treatments before corrosion exposure. Two aging temperatures were employed, 170 and 210 °C, for aging times spanning the underaged, peak-aged and overaged conditions. Hydrogen uptake was induced by exfoliation corrosion. Hydrogen evolution from trapping sites was followed by thermal desorption spectroscopy. High resolution transmission electron microscopy combined with geometric phase analysis was performed to analyze the coherency of the precipitates. The results indicated that the coherency state between precipitates and the matrix plays an important role in hydrogen trapping. Hydrogen evolving at 300 °C (T2 state) corresponds to hydrogen trapped by the stress fields of coherent GPB zones and S΄΄ (Al₁₀Cu₃Mg₃) phases, which form at aging temperatures, below the corresponding solvus temperature.

氢俘获是导致可热处理高强度铝合金氢脆的因素之一。通过在腐蚀暴露前进行人工时效处理，研究了沉淀的相干性对 2024 铝合金中腐蚀诱导的氢俘获的影响。采用了两个时效温度，170 和 210 °C，用于跨越欠时效、峰值时效和过度时效条件的时效时间。氢吸收是由剥落腐蚀引起的。从捕获位点析氢后进行热解吸光谱分析。进行高分辨率透射电子显微镜结合几何相分析来分析沉淀的相干性。结果表明，析出物与基体之间的相干态在氢俘获中起重要作用。在 300 °C（T2 状态）析出的氢对应于被相干 GPB 区和 S΄΄（Al₁₀ Cu ₃ Mg ₃ ) 相，在低于相应固溶线温度的时效温度下形成。