Abstract

The AA6061-T6 alloy is used in many industrial applications such as hydraulic pistons, aerospace and marine vehicle fittings, including the nuclear reactors due to their excellent joining and coating properties, high strength, good formability, high resistance to aquatic corrosion and neutron transparency. This study consists of high temperature oxidation for which the samples were oxidized using thermogravimetric analysis, at a temperature of 580°C in an atmosphere that contains air and argon. Exposure of exposure times at 580°C varied from 15 min to 8 h, which permitted to understand the mechanism of oxide formation mechanisms in this alloy and progressive formation of oxide layers on the surface. The chemistry, thickness and the morphology of the oxide layer formed on the surface was characterized by scanning electron microscopy (SEM-EDS), X-ray diffraction which revealed the existence of the following elements in the oxide layer, such as Al₂O₃, Al₉Si, SiO₂, MgO and Mg₃O₄. Results showed that the oxide layer becomes thicker with the increasing exposure time and is accompanied by a loss of weight compared to the mass formed at the beginning of the thermogravimetric analysis.

中文翻译：

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AA6061-T6 合金在 580°C 温度下的随时间环境氧化

摘要

AA6061-T6 合金由于其优异的连接和涂层性能、高强度、良好的成型性、高抗水腐蚀和中子透明性，被用于许多工业应用，如液压活塞、航空航天和船舶配件，包括核反应堆。该研究包括高温氧化，其中使用热重分析在 580°C 的温度下，在含有空气和氩气的气氛中对样品进行氧化。在 580°C 下的暴露时间从 15 分钟到 8 小时不等，这有助于了解该合金中氧化物形成机制和表面氧化层的逐渐形成。通过扫描电子显微镜（SEM-EDS）表征表面上形成的氧化层的化学性质、厚度和形态，₂ O ₃、Al ₉ Si、SiO ₂、MgO和Mg ₃ O ₄。结果表明，氧化层随着暴露时间的增加而变得更厚，并且与热重分析开始时形成的质量相比，伴随着重量的减轻。