Lu Bochao, Zhang Yimeng, Guo Ding, Li Yan, Zhang Ruiyong, Cui Ning, Duan Jizhou
Key Laboratory of Advanced Marine Materials, Key Laboratory of Marine Environmental Corrosion and Biofouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, China.
Materials (Basel). 2024 Jul 16;17(14):3523. doi: 10.3390/ma17143523.
Microbial contamination in aircraft fuel-containing systems poses significant threats to flight safety and operational integrity as a result of microbiologically influenced corrosion (MIC). Regular monitoring for microbial contamination in these fuel systems is essential for mitigating MIC risks. However, the frequency of monitoring remains a challenge due to the complex environmental conditions encountered in fuel systems. To investigate the impact of environmental variables such as water content, oxygen levels, and temperature on the MIC of aluminum alloy in aircraft fuel systems, orthogonal experiments with various combinations of these variables were conducted in the presence of sulfate-reducing bacteria. Among these variables, water content in the fuel oil demonstrated the most substantial influence on the corrosion rate of aluminum alloys, surpassing the effects of oxygen and temperature. Notably, the corrosion rate of aluminum alloys was the highest in an environment characterized by a 1:1 water/oil ratio, 0% oxygen, and a temperature of 35 °C. Within this challenging environment, conducive to accelerated corrosion, changes in the corrosion behavior of aluminum alloys over time were analyzed to identify the time point at which MIC intensified. Observations revealed a marked increase in the depth and width of corrosion pits, as well as in the corrosion weight-loss rate, starting from the 7th day. These findings offer valuable insights for determining the optimal frequency of microbial contamination detection in aircraft fuel systems.
由于微生物影响的腐蚀（MIC），飞机燃油系统中的微生物污染对飞行安全和运行完整性构成重大威胁。定期监测这些燃油系统中的微生物污染对于降低MIC风险至关重要。然而，由于燃油系统中遇到的复杂环境条件，监测频率仍然是一个挑战。为了研究水含量、氧气水平和温度等环境变量对飞机燃油系统中铝合金MIC的影响，在存在硫酸盐还原菌的情况下，对这些变量的各种组合进行了正交实验。在这些变量中，燃油中的水含量对铝合金的腐蚀速率影响最为显著，超过了氧气和温度的影响。值得注意的是，在水/油比为1:1、氧气含量为0%、温度为35°C的环境中，铝合金的腐蚀速率最高。在这种有利于加速腐蚀的具有挑战性的环境中，分析了铝合金腐蚀行为随时间的变化，以确定MIC加剧的时间点。观察结果显示，从第7天开始，腐蚀坑的深度和宽度以及腐蚀失重率显著增加。这些发现为确定飞机燃油系统中微生物污染检测的最佳频率提供了有价值的见解。
