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Preparation of Al-based amorphous coatings and their properties
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.jre.2020.04.018
Lei Jin , Le Zhang , Kaige Liu , Zhigang Che , Kai Li , Ming Zhang , Bo Zhang

Abstract Al86Ni8Co1La1Y2Gd2 amorphous coatings were prepared using cold gas kinetic spray technology. The results show that Al86Ni8Co1La1Y2Gd2 amorphous coatings are achieved with the porosity about 3.2%, thickness about 893 μm, the amount of amorphous phase about 82.5%, the hardness about 300HV0.2. The corrosion potential and anti-corrosion life of 7075 T6 alloy aluminum are about −0.78 V and 72 h, respectively. The electrochemical analysis and neutral salt spray are about −0.69 V corrosion potential and 274 h anti-corrosion life for amorphous Al-based coatings, respectively. Therefore, the life of the Al-based amorphous coatings is about 3.8 times that of 7075 T6 aluminum alloy. Besides, the failure mechanism was analyzed using TEM in this investigation. In a word, Al86Ni8Co1La1Y2Gd2 coatings keep dense structure, high amorphous content, favorable amorphous phase stabilizing ability and longer anti-corrosion life. That is, Al86Ni8Co1La1Y2Gd2 coatings have better comprehensive properties. Therefore, these findings indicate that the present Al86Ni8Co1La1Y2Gd2 amorphous coatings prepared using cold gas kinetic spray technique can protect aluminum alloy very well and they can be considered to be used in aviation field.

中文翻译:

铝基非晶涂层的制备及其性能

摘要 采用冷气动力喷涂技术制备了Al86Ni8Co1La1Y2Gd2非晶涂层。结果表明,获得的Al86Ni8Co1La1Y2Gd2非晶涂层孔隙率约为3.2%,厚度约为893 μm,非晶相含量约为82.5%,硬度约为300HV0.2。7075 T6合金铝的腐蚀电位和防腐寿命分别约为-0.78 V和72 h。电化学分析和中性盐雾对非晶铝基涂层的腐蚀电位分别约为 -0.69 V 和 274 h 的防腐寿命。因此,铝基非晶涂层的寿命约为7075 T6铝合金的3.8倍。此外,在本研究中使用 TEM 分析了失效机制。总之,Al86Ni8Co1La1Y2Gd2涂层结构致密,非晶含量高,良好的非晶相稳定能力和更长的防腐寿命。即Al86Ni8Co1La1Y2Gd2涂层具有较好的综合性能。因此,这些研究结果表明,采用冷气动力喷涂技术制备的Al86Ni8Co1La1Y2Gd2非晶涂层可以很好地保护铝合金,可以考虑用于航空领域。
更新日期:2020-05-01
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