High temperature oxidation behavior and anti-oxidation mechanism of Ti50Al anodized in ionic liquid
High temperature oxidation behavior and anti-oxidation mechanism of Ti50Al anodized in ionic liquid
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DOI：
10.1016/j.surfcoat.2016.08.084
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发表时间：
2016-12
影响因子：
5.4
通讯作者：
M. Mo;Lian-Kui Wu;Huazhen Cao;Junpin Lin;D. Lu;G. Zheng
中科院分区：
文献类型：
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作者：
M. Mo;Lian-Kui Wu;Huazhen Cao;Junpin Lin;D. Lu;G. Zheng
在离子液体1-丁基-3-甲基咪唑六氟磷酸盐（BmimPF 6）中，采用阳极氧化法在Tisingle bond 50铝合金表面制备了富铝富氟阳极氧化膜。深入研究了氟在阳极氧化膜形成中的作用机理。结果表明，离子液体中的微量残余水是形成含氧阳极膜的主要原因。这种富铝结构的形成是由于氟化钛和氟化铝在离子液体中的溶解度不同所致。X射线光电子能谱分析表明，在高于300 °C的温度下，氟化铝可被氧化成Al 2 O3保护层。该迁移层与阳极氧化过程中形成的Al 2 O3层一起，有效地抑制了Al的向外扩散和氧的向内扩散，从而提高了Tisingle键50 Al的高温抗氧化性。在1000 °C下氧化100 h后，在阳极氧化的Tisingle bond 50 Al上没有观察到裂纹和飞溅。
An aluminum and fluorine enriched anodic film was fabricated on Tisingle bond50Al by anodizing in ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate (BmimPF6). The formation mechanism and the exact role of fluorine for the generation of this anodic film were deeply investigated. Results show that the trace amounts of residual water in the ionic liquid were responsible for the generation of oxygen contained anodic film. And the formation of this aluminum enriched structure is the result of the different solubility of titanium fluoride and aluminum fluoride during the anodization in the ionic liquid. X-ray photoelectron spectroscopy analysis shows that the aluminum fluoride can be oxidized to protective Al2O3layer at temperature higher than 300 °C. This transported Al2O3layer together with the previously formed Al2O3during anodization can efficiently inhibit the outward diffusion of Al and inward diffusion of oxygen, therefore improve the high temperature oxidation resistance of the Tisingle bond50Al. Upon 100 h oxidation at 1000 °C, no cracks and spallation are observed on the anodized Tisingle bond50Al.