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针对载人航天器舱中材料的微生物腐蚀问题,采用腐蚀失重法、溶解性元素浓度分析、形貌观察和电化学测试等,评估了载人航天器神舟九号和神舟十号舱内的三株下行细菌对LY12铝合金腐蚀行为的影响。与无菌对照比,LY12铝合金在接种菌H1、H3和菌S10-1体系中的腐蚀速率分别增加了9.09%、2.26%和22.71%,溶解性铝浓度分别增加了44.74%、31.58%和30.53%。扫描电镜显示LY12铝合金表面形成了一层生物膜和腐蚀产物,清洗后表面腐蚀程度更加明显。电化学分析表明:细菌能改变铝合金表面的电化学性质进而加速腐蚀过程。
In view of the microbial corrosion of materials in manned spacecraft, the corrosion weight loss method, the analysis of dissolved element concentration, morphology observation and electrochemical test were used to evaluate the effect of the three manned spacecraft Shenzhou-9 and Shenzhou- Effect of Downstream Bacteria on Corrosion Behavior of LY12 Aluminum Alloy. Compared with the sterile control, the corrosion rate of LY12 aluminum alloy increased 9.09%, 2.26% and 22.71% respectively in the inoculation bacteria H1, H3 and bacteria S10-1, the dissolved aluminum concentration increased 44.74%, 31.58% and 30.53%. Scanning electron microscopy showed that a layer of biofilm and corrosion products were formed on the surface of LY12 aluminum alloy. The degree of surface corrosion after cleaning was more obvious. Electrochemical analysis shows that bacteria can change the electrochemical properties of the aluminum alloy surface and thus accelerate the corrosion process.