研究了Cu-25Ni-25Ag合金在600℃和700℃ 空气中的氧化。 合金由富Ag的α相与Cu-Ni固 溶体β相组成。 氧化速率大致服从抛物线规律， 除短时间的加速氧化外， 随着氧化 的进行氧 化速率逐渐减小。 尽管存在Ag和Ni， 但合金成膜速率与纯Cu的相近。 在不同温 度下 合金都形成了外层为CuO， 内层为Cu2O， NiO和Ag颗粒组成的复杂氧化膜。 同时， 氧化 膜最前沿的Cu-Ni固溶体颗粒仅表面部分氧化， 未氧化的内核被连续NiO所包围 。
The oxidation of Cu-25Ni-25Ag alloy at 600℃ and 700℃ in air was studied. The alloy contains a mixture of silver-rich α phase and copper-nickel solid solution β phase. The scaling rates of the alloy are substantially similar to that of pure copper, in spite of the presence of silver and NiO in the scales. Complex scales are formed with outermost layer of copper oxides and inner region of a mixture of Cu2O, NiO and a number of silver metal particles. The particles of β phase in the innermost scale region are oxidized only around their surface, leaving an unoxidized core surrounded by NiO.
参考文献
| [1] | Massalski T B;Murry J L;Bennett L H.Binary Alloy Phase Diagrams[M].ASM Metals Park; Ohio,1986 |
| [2] | Gesmundo F;Asmundis C;Merlo S .The high temperature corrosion resistance of α-phase bronzes[J].Werkstoffe und Korrosion,1979,30:114. |
| [3] | ATKINSON A;Taylor R I;Hughes A E.High Temperature Corrosion[M].NACE Houston,1983 |
| [4] | Whittle D P;Wood G C .Two-phase scale formation on Cu-Ni alloys[J].Corrosion Science,1968,8:289. |
| [5] | Hausgrud R;Kofstad P .On the high-temperature oxidation of Cu-rich Cu-Ni alloys[J].Oxidation of Metals,1998,50:189. |
| [6] | Hausgrud R .On influence of non-protective CuO on high temperature oxidation of Cu-rich Cu-Ni based alloys[J].Oxidation of Metals,1999,52:427. |
| [7] | Niu Y;Gesmundo F;Viani F et al.The air oxidation of two-phase Cu-Ag alloys at 650～750*!℃[J].Oxidation of Metals,1997,47:21. |
| [8] | Zhao Z L;Niu Y;Gesmundo F et al.Air oxidation of nanophase Ni-Ag alloys at 600～700*!℃[J].Oxidation of Metals,2000(54):559. |
| [9] | Gesmundo F;Viani F;Niu Y .The possible scaling modes in the high-temperature oxidation of two-phase binary alloys.Part I: high oxidant pressure[J].Oxidation of Metals,1994,42:409. |
| [10] | Gesmundo F;Niu Y;Viani F .The possible scaling modes in the high-temperature oxidation of two-phase binary alloys.Part II: low oxidant pressure[J].Oxidation of Metals,1995,43:379. |
| [11] | Niu Y;Gesmundo F;Douglass D L et al.The air oxidation of two-phase Cu-Cr alloys at 700～900*!℃[J].Oxidation of Metals,1997,48:357. |
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