机载电子系统铝合金冷板-冷却液腐蚀性研究

目的可靠表征机载电子设备液冷系统中铝合金冷板在其使用环境下(冷却液介质中)腐蚀程度与时间的关系,为确定其使用寿命及对其进行腐蚀防护与控制提供技术支持。方法根据飞机液冷系统冷板的服役环境特点,开展铝合金冷板冷却液恒温浸泡试验和冷却液恒温冲刷试验,观察试验件宏观和微观状况,采用最大蚀坑深度值的变化进行腐蚀程度的量化表征。结果恒温浸泡试验120天,试验件宏观和微观腐蚀形貌,以及蚀坑深度均无明显变化;冲刷试验320 h,试验件宏观腐蚀形貌无变化,微观腐蚀形貌轻微加重,蚀坑深度平稳增加。结论浸泡和冲刷试验结果对比得出,高速冲刷的冷却液因杂质累积、成分挥发等导致性能变化,加速铝合金冷板的腐蚀。

Corrosion Resistance of Aluminum Alloy Cold Plate- Cooling Liquid in Airborne Electronic System

Objective To reflect the relationship between the corrosion degree and the time of the aluminum alloy cold plate which is used in the cooling system of airborne electronic equipment reliably and provide technical support for the corrosion prevention and control for determination of the service life. Methods Constant temperature immersion test and scour test of aluminium alloy cold plate in constant temperature coolant according to the service environment characteristics of cold plate in the aircraft liquid cooling system to observe macro and micro morphology of specimen. Change of maximum pit depth was adopted to complete quantitative characterization of corrosion degree. Results After immersion experiment at constant temperature for 120 days, there was no significant change observed on macro and micro corrosion morphology as well as pit depth; after scour experiment for 320 hours, the macroscopic corrosion morphology had no change, the micro morphology of corrosion slightly increased, the corrosion pit depth increased steadily. Conclusion Based on comparison of the results of immersion and scouring tests, high speed flush coolant accelerates the corrosion of aluminum alloy plate by impurities accumulated and volatile component performance change.