(1. 中國(guó)科學(xué)院 金屬研究所, 金屬腐蝕與防護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室， 沈陽 110015;
2. Universita di Genova, Fiera del Mare, Pad. D, 16129 Genova, Italy)
摘 要: 研究了Cu-25Ni-25Ag合金在600 ℃和700 ℃空氣中的氧化。合金由富Ag的α相與Cu-Ni固溶體β相組成。氧化速率大致服從拋物線規(guī)律，除短時(shí)間的加速氧化外，隨著氧化的進(jìn)行氧化速率逐漸減小。盡管存在Ag和Ni，但合金成膜速率與純Cu的相近。在不同溫度下合金都形成了外層為CuO，內(nèi)層為Cu-2O，NiO和Ag顆粒組成的復(fù)雜氧化膜。同時(shí)，氧化膜最前沿的Cu-Ni固溶體顆粒僅表面部分氧化，未氧化的內(nèi)核被連續(xù)NiO所包圍。
關(guān)鍵字: 三元合金； Cu-Ni-Ag； 雙相合金； 氧化
at 600 ℃ and 700 ℃ in air
（1. State Key Laboratory for Corrosion and Protection, Institute of Metals Research,
Chinese Academy of Sciences, Shenyang 110015, P.R.China;
2. Universita di Genova, Fiera del Mare, Pad. D, 16129 Genova, Italy）
Abstract: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 solidsolution 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 innerregion of a mixture of Cu 2O, NiO and a numberof silver metal particles. The particles of β phase in the innermost scale regionare oxidized only around their surface, leaving an unoxidized core surrounded by NiO.
Key words: ternary alloy; Cu-25Ni-25Ag; twophase; oxidation
