(1. 中南大學 材料科學與工程學院，長沙 410083；
2. 中國印鈔造幣總公司 沈陽造幣技術研究所，沈陽 110042)
摘 要: 設計并制備一種新型的抗變色仿金稀土銅合金。采用金相組織分析、中性鹽霧試驗、質量損失法、電化學阻抗譜和掃描電鏡等手段對比研究所設計合金與現(xiàn)有造幣用H72-1-1合金的組織結構、抗變色性能和耐蝕性能。結果表明：所設計合金退火組織細小、均勻，在3.5%NaCl溶液中保持不變色的時間較H72-1-1合金的延長了25%。在3.5%NaCl溶液中浸泡腐蝕過程中，所設計合金形成了一層均勻致密、完整的腐蝕產(chǎn)物膜，減緩了腐蝕的進程，其耐腐蝕性能優(yōu)于H72-1-1合金的，腐蝕速率為10.3 μm/a；所設計合金電荷轉移電阻Rct、Warburg擴散阻抗ZW與H72-1-1合金的相比都有大幅度的提高，腐蝕過程阻力增加。
關鍵字: 仿金合金；銅合金；抗變色性能；耐蝕性能
novel colour-stable imitation gold copper alloy with rare earth
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Research Institute of Shenyang Mint, China Banknote Printing and Minting Corporation, Shenyang 110042, China）
Abstract:A novel colour-stable imitation gold copper alloy with rare earth was designed and prepared. The microstructures, anti-tarnishing and corrosion resistance properties of the designed alloy and the existing mint metal of H72-1-1 were compared by means of metallographic analysis, neutral salt spray test, mass loss measurement, electrochemical impedance spectroscopy and scanning electron microscopy. The results show that the annealed microstructure of the designed alloy is fine and homogeneous, and discoloring time of the alloy in 3.5% NaCl solution is 25% longer than that of H72-1-1 alloy. The mass loss rate of the designed alloy is slightly lower than that of the H72-1-1 alloy in 3.5% NaCl solution, which can be attributed to the uniform and compact corrosion film which retards the corrosion process, and the corrosion rate is 10.3 μm/a. The charge transfer resistance Rct and the diffusion impedance ZW of the designed alloy increase much more greatly than those of the H72-1-1 alloy, which increases the corrosion process resistance.
Key words: imitation gold alloy; copper alloy; anti-tarnishing performance；corrosion resistance performance
