利用Ni与不同粒度的Cr颗粒通过复合电镀的方法分别制备了Ni-7.5Cr(平均粒度为21 nm)、Ni-10.9Cr(平均粒度为39 nm)和Ni-12.4Cr(平均粒度为2.4μm)的Ni-Cr复合镀层.Ni-Cr纳米复合镀层与Ni-Cr复合微米颗粒镀层相比,其颗粒分布更为均匀,颗粒间距减少2～3个数量级.900℃恒温氧化实验结果表明:复合微米颗粒的Ni-Cr镀层只形成NiO膜,不能形成连续的Cr2O3膜,氧化速率很快;而Ni-Cr纳米复合镀层,由于能形成连续的Cr2O3膜,氧化速率显著降低,并且这种颗粒尺寸效应随粒度越细越明显.文中对颗粒尺寸效应进行了探讨.
参考文献
| [1] | Atkinson H V .A review of the role of short-circuit diffusion in the oxidation of nickel,chromium and nickel-chromium alloys[J].Oxidation of Metals,1985,24:177-197. |
| [2] | Goward G W .Overview protective coatings-purpose role and design[J].Materials Science and Technology,1986,2:194-199. |
| [3] | Peng X;Ping D;Li T et al.Oxidation behaviour of a Ni-La2O3codeposited film on nickel[J].Journal of the Electrochemical Society,1998,145:389-398. |
| [4] | Goward G W;Boone D H .Mechansims of formation of diffusion aluminide coatings on nickel-base superalloys[J].Oxidation of Metals,1971,3:475-481. |
| [5] | Nicholls J R;Hancocl P;Al-Yasiri L H .Optimising oxidation resistance of MCrAl coating systems using vapour phase alloy design[J].Materials Science and Technology,1989,5:799-808. |
| [6] | Wang F;Lou H .Oxidation behaviour and scale morphology of normai-grained CoCrAl alloy and its sputtered microcrystalline coating[J].Materials Science and Engineering,1990,A129:279-285. |
| [7] | Lou H;Zhu S;Wang F et al.Rehealing ability of oxide scale formed on microcrystalline K38G coating[J].Oxidation of Metals,1995,43:317-329. |
| [8] | Y. Zhang;X. Peng;F. Wang .Development and oxidation at 800℃ of a novel electrodeposited Ni-Cr nanocomposite film[J].Materials Letters,2004(6):1134-1138. |
| [9] | Zhou Y;Peng X;Wang F .Oxidation of a novel electrodeposited Ni -Al nanocomposite film at 1050℃[J].Scripta Materialia,2004,50:1429-1423. |
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%