采用在Ni基上复合电镀Ni-Al2O3纳米复合涂层后在1100 ℃扩散渗铬3 h的方法,制备Al2O3改性的渗铬涂层.作为对比,采用相同的工艺在单Ni镀层上直接渗铬,获得一种不含Al2O3纳米粒子的渗铬涂层.SEM/EDS和TEM结果表明:Al2O3纳米颗粒均匀分布在Ni纳米晶中, 纳米Al2O3颗粒的加入不仅细化基体Ni的晶粒尺寸,而且明显抑制在渗铬过程中涂层晶粒的长大.900 ℃, 120 h的氧化试验结果表明:与不含Al2O3纳米粒子的渗铬涂层相比,Al2O3改性的渗铬涂层所具有的细晶结构促进了保护性氧化物形成元素Cr沿晶界向氧化前沿的快速扩散,从而有利于保护性Cr2O3氧化膜的快速形成,同时改变氧化膜的形成过程,降低氧化速度,使得Al2O3改性的渗铬涂层表现出更优异的抗氧化性能.并对Al2O3渗铬涂层的组织及氧化机制进行了分析.
参考文献
[1] | Atkinson H V .[J].Oxidation of Metals,1985,24:177. |
[2] | Goward G W.[J].Materials Science and Technology,1986(02):194. |
[3] | Goward G W;Boone D H .[J].Oxidation of Metals,1971,3:475. |
[4] | Zhou W;Zhao Y G;Li W et al.[J].Materials Science and Engineering A,2007,458:34. |
[5] | Zhu L;Peng X;Yan J et al.[J].Oxidation of Metals,2004,62:411. |
[6] | Yan J;Peng X;Wang F .[J].Materials Science and Engineering A,2006,426:266. |
[7] | Zhang H;Peng X;Zhao J et al.[J].Electrochemical and Solid-State Letters,2007,10(03):C12. |
[8] | Zhou YB;Chen H;Zhang H;Wang Y .Preparation and oxidation of an Y2O3-dispersed chromizing coating by pack cementation at 800 degrees C[J].Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology,2008(8):748-753. |
[9] | Zhou Y B;Zhang H J;Wang Z T .[J].Corrosion Reviews,2008,26(01):39. |
[10] | ZHOU Yue-bo,ZHANG Hai-jun,WANG Zhen-ting.Effect of Y2O3 on microstructure and oxidation of γ-Ni+γ'-Ni3Al coatings transformed from electrodeposited Ni-Al films at 1 000 ℃[J].中国有色金属学会会刊(英文版),2008(02):297-302. |
[11] | Zhou Yuebo;Chen Hongyu;Zhang Haijun .[J].Transactions of Nonferrous Metals Society of China,2008,18(03):589. |
[12] | Hou P Y;Stringer J .[J].Oxidation of Metals,1988,29:45. |
[13] | Mitra S K;Roy S K;Bose S K .[J].Oxidation of Metals,1990,34:101. |
[14] | Cotekk C M;Yuerk G J;Hussey R J et al.[J].Oxidation of Metals,1990,34:173. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%