扩散温度对TC4合金表面Cu/Ni复合镀层结构及耐蚀性能的影响
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摘要
采用扩散热处理研究了Cu/Ni/Ti复合镀层不同温度下的扩散行为,分析了扩散层结构,并讨论了扩散温度对镀层结构及耐蚀性能的影响。结果表明:由于Cu/Ni/Ti原子之间的互扩散,形成稳定的扩散层,可以有效提高镀层表面耐蚀性能;随着热扩散温度上升到700℃,膜层结构致密,在扩散层中形成了Ni_xTi_y金属间化合物及少量的Cu_xTi_y金属间化合物,镀层表面的耐蚀性最好;温度升高到800℃时,在膜层界面处引发了Kirkendall效应,所形成的Kirkendall空位相互聚集长大,形成裂纹或孔洞,使得镀层疏松多孔,从而降低了耐蚀性。
The diffusion behavior of Cu/Ni/Ti composite coating at different temperatures was studied by diffusion heat treatment. The influence of diffusion temperature on the structure and corrosion behavior of the coating was also discussed. The results show that the corrosion resistance of the coating surface can be effectively improved with the stable diffusion layer formed by the mutual diffusion of Cu/Ni/Ti atoms. As the thermal diffusion temperature is up to 700 °C, a compact structure of membrane layer, the NixTiy intermetallic compounds and a small amount of CuxTiy intermetallic compounds form in the diffusion layer, and the corrosion resistance is the best.When the temperature is up to 800 °C, Kirkendall effect occurs and Kirkendall space aggregates and grows up, which form cracks and holes; thus the coating becomes porous, and the corrosion resistance is lowered.
The diffusion behavior of Cu/Ni/Ti composite coating at different temperatures was studied by diffusion heat treatment. The influence of diffusion temperature on the structure and corrosion behavior of the coating was also discussed. The results show that the corrosion resistance of the coating surface can be effectively improved with the stable diffusion layer formed by the mutual diffusion of Cu/Ni/Ti atoms. As the thermal diffusion temperature is up to 700 °C, a compact structure of membrane layer, the NixTiy intermetallic compounds and a small amount of CuxTiy intermetallic compounds form in the diffusion layer, and the corrosion resistance is the best.When the temperature is up to 800 °C, Kirkendall effect occurs and Kirkendall space aggregates and grows up, which form cracks and holes; thus the coating becomes porous, and the corrosion resistance is lowered.
引文
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[3]Shen Z C,Xie F Q,Wu X Q et al.China Surface Engineering[J],2012,25(5):45
[4]Khosravi G,Sohi M H,Ghasemi H M et al.International Journal of Surface Science and Engineering[J],2015,9(1):43
[5]Deillon L,Zollinger J,Daloz D et al.Materials Characterization[J],2014,97:125
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[7]Ayd?n K,Kaya Y,Kahraman N.Materials&Design[J],2012,37:356
[8]Sabetghadam H.,Hanzaki A Z,Araee A.Materials Characterization[J],2010,61(6):626
[9]Kundu S,Chatterjee S.Materials Characterization[J],2008,59(5):631
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[15]Seitz F.Acta Metallurgica[J],1953,1(3):355
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