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Stress corrosion behavior of 2195-T8 Al-Li alloy with an artificial pit exposed to a 30vol%HNO3 solution

Chinese Journal of Aeronautics 2023年第2期36卷 304-315页

作者： Dejun LIU Gan TIAN Zhengwei YANG Guofeng JIN Wei ZHANG Yin WANG Huali WEI School of Missile Engineering Rocket Force University of EngineeringXi'an 710038China Xi'an Institute of Aerospace Composites Xi'an 710025China

This paper experimentally studied the stress corrosion behavior of 2195-T8 Al-Li alloys with prefabricated pits in 30vol%*** microstructure was observed and determined by the scanning electron microscopy and the transmission electron *** typical corrosion features,i.e.,regular or irregular corrosion pits and sub/intergranular corrosion,were investigated,and the role of stress were *** statistical results of the number and area of corrosion pits in various sizes were studied using an improved image processing *** results demonstrate that stress affects the intergranular corrosion or sub-intergranular corrosion of the alloy most,and promotes them to evolve into cracks under stress *** also plays a role in accelerating corrosion severity of certain corrosion *** number of corrosion pits with an area of 0–50μm~2 can be seen as an index to reflect the degree of ***,a corrosion phenomenon,i.e.,the pit bottom in the site with the maximum stress locally suffering from no severe corrosion,was observed and discussed.

关键词： Al-Li alloy Artificial pit corrosion features Image processing Stress corrosion

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Characterization of localized corrosion pathways in 2195-T8 Al-Li alloys exposed to acidic solution

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Defence Technology（防务技术） 2023年第7期25卷 152-165页

作者： De-jun Liu Gan Tian Guo-feng Jin Wei Zhang You-hong Zhang Rocket Force University of Engineering College of Missile EngineeringChina

The corrosion properties of aluminum-lithium(Al-Li) alloys, which are potential materials used to construct for tanks of liquid rockets or missiles, are essential for safe propellant storage and transport. In order to manifest the corrosion resistance of the 2195 Al-Li alloy in practical propellant tanks filled with N2O4, the alloy was soaked in 30% nitric acid solution, an accelerating corrosion environment, to test its corrosion behavior. Scanning electron microscopy(SEM) and transmission electron microscopy(TEM)were used to characterize microstructure and corrosion morphology of the alloy. Focused ion beam(FIB),combined with SEM, was used to demonstrate localized corrosion features and the propagation of corrosion pathways beneath the alloy surface. It was found that the corrosion network was formed with most intergranular corrosion and sparse intragranular corrosion. Additionally, the distribution and number of intermetallic particles influenced the localized corrosion degree and the direction of corrosion pathways. Aggregated particles made corrosion pathways continuously and caused more severe corrosion. The results from this work were valid and useful to corrosion prevention and protection for storage safety on propellant tanks in N_(2)O_(4).

关键词： Al-Li alloy corrosion behavior corrosion features Immersion test Intermetallic particles

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维普期刊数据库

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