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研究了不同能量氮离子注入对7049铝合金基体纳米结构的影响及其在3.5%NaCl溶液中的腐蚀抑制作用。XRD结果表明,氮离子注入可导致氮化铝的形成。原子力显微镜(AFM)结果表明,随着氮离子能量的增大,晶粒增大,这是因为注入过程中样品的储热产生了较高的扩散速率,从而减少缺陷。采用电化学交流阻抗谱(EIS)研究了样品的耐腐蚀性,结果表明随着氮离子能量的增大,注入氮离子的铝样品的耐腐蚀性随之增大。根据EIS数据得到了注入氮离子的铝样品的等效电路,该等效电路元件强烈依赖样品形貌。最后,研究了腐蚀抑制和等效电路元件的关系。
The effects of different energy nitrogen ion implantation on the microstructure of 7049 aluminum alloy matrix and its corrosion inhibition in 3.5% NaCl solution were studied. XRD results show that nitrogen ion implantation can lead to the formation of aluminum nitride. Atomic force microscopy (AFM) results show that with the increase of nitrogen ion energy, the grain size increases because the sample heat storage produces a higher diffusion rate during implantation, thereby reducing defects. The corrosion resistance of the samples was investigated by electrochemical impedance spectroscopy (EIS). The results show that with the increase of nitrogen ion energy, the corrosion resistance of the aluminum samples with nitrogen ions increases. Based on the EIS data, an equivalent circuit of an aluminum sample implanted with nitrogen ions was obtained. The equivalent circuit element strongly depends on the morphology of the sample. Finally, the relationship between corrosion inhibition and equivalent circuit components is studied.