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

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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A corrosion study on W-Cu alloys in sodium chloride solution at different pH

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Journal of Materials Science & Technology 2021年第5期64卷 38-56页

作者： Dawei Guo Chi Tat Kwok Department of Electromechanical Engineering University of MacaoMacaoChina Institute of Applied Physics and Materials Engineering University of MacaoMacaoChina

A corrosion study of two types of tungsten-copper(W-Cu)alloys in 3.38 wt.%Na Cl solution with different pH at 25℃were investigated using potentiodynamic polarization and immersion test.It is crucial that the corrosion behavior and preferential attacked phases of the W-Cu alloys were found to alter with p H.The micro-galvanic effect of tungsten phase and copper binder played a significant role.It was also proved that the existence of aggressive chloride ions could accelerate the Cu binder dissolution in acidic and neutral solution,which induced tungsten phase detachment and increased the corrosion rate of the W-Cu alloys.While Cl-would accelerate the Cu binder dissolution of W-Cu alloys at high potential during polarization test in strong alkaline solution.

关键词： Tungsten-copper alloys Galvanic corrosion Potentiodynamic polarization immersion test Chloride ion

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Microstructures and Corrosion Resistance of Al_2O_3-C Based Refractories to the Melts Containing Titania

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China's Refractories 2002年第1期11卷 3-8页

作者： LIUQingai W.Newkirk 等 CollegeofMaterialsScienceandEngineering ChongqingUniversityChongqingP.R.China400044 DepartmentofMetallurgicalEngineering UniversityofMissouri－RollaRollaMO65409USA

The corrosion resistance of the Al2O3-C based refractories in melts containing titania has been studied by quasi-station immersion and rotary immersion. The corrosionrate is decreased with the addition of graphite carbon, and ZrO2 in the refractories . The corrosion, mechanism of Al2O3-C refractories, is. the oxidization of graphite carbon by the oxides of the melts the formation of deteriorate layer, For the Al2O3-C-ZrO2 refractories, the corrosion behavior is due to the, interaction between melts and refractories . The new compounds of FeO. SiO2, SiZrO4, FeO. 3 CaO, 2CaO. SiO2 and CaO. SiO2 are formed in the deteriorate layer.

关键词： Melts Alumina-carbon based refractory immersion test Corrosion resistance

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