Single-sided aluminized polyimide films (SAPF) are widely used in thermal management of aerospace systems. Although the reliability of SAPF in space environments has been thoroughly studied, its reliability in ground environments during storage is always ignored, potentially leading to system failure. This paper aims to investigate the reliability of SAPF in storage environments, focusing on the effects of temperature and relative humidity. Firstly, the relationship between the performance degradation of SAPF and aluminum corrosion is identified. Next, considering the presence of two distinct stages in the influence of temperature on aluminum corrosion, a novel degradation model accounting for the degradation mechanism transition is developed. Additionally, a parameter analysis method is proposed for determining SAPF degradation mechanism based on experimental data. Then, a statistical analysis method incorporating an improved rime optimization algorithm is employed for parameter estimation, and the reliability model is established. Experimental results demonstrate that the proposed method effectively identifies two distinct stages in the impact of temperature on SAPF performance degradation. Furthermore, the proposed degradation model outperforms traditional degradation models with unchanged degradation mechanism in terms of degradation prediction accuracy, extrapolation capability and robustness, indicating its suitability for describing the degradation pattern of SAPFs.

翻译：单面镀铝聚酰亚胺薄膜（SAPF）广泛应用于航空航天系统的热管理。尽管SAPF在空间环境中的可靠性已得到深入研究，但其在地面贮存环境中的可靠性常被忽视，这可能导致系统故障。本文旨在研究SAPF在贮存环境中的可靠性，重点关注温度和相对湿度的影响。首先，明确了SAPF性能退化与铝腐蚀之间的关系。其次，考虑到温度对铝腐蚀的影响存在两个不同阶段，建立了一种考虑退化机制转变的新型退化模型。此外，提出了一种基于实验数据确定SAPF退化机制的参数分析方法。随后，采用结合改进霜冰优化算法的统计分析方法进行参数估计，并建立了可靠性模型。实验结果表明，所提方法能有效识别温度对SAPF性能退化影响的两个不同阶段。此外，所提出的退化模型在退化预测精度、外推能力和鲁棒性方面均优于退化机制不变的传统退化模型，表明其适用于描述SAPF的退化规律。