(1. 中南大學 材料科學與工程學院，長沙 410083；
2. 中南大學 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用色差測試、電化學測試、靜態(tài)腐蝕測試、掃描電鏡分析、電化學阻抗測試和X射線光電子能譜分析等方法，研究仿金Cu-Zn-Ni-Sn合金在人工海水和人工汗液中的腐蝕行為。合金在人工海水腐蝕初期的腐蝕產物層主要為較為致密的Cu2O和具有良好耐腐蝕性能的ZnO、Zn5(CO3)2(OH)6和 Zn5(OH)8Cl2？H2O等氧化產物，該氧化膜兩側界面的傳質過程是腐蝕反應發(fā)生的決速步驟。在人工汗液中腐蝕初期的主要腐蝕產物主要為疏松的CuO和不穩(wěn)定的SnO，使其腐蝕產物膜疏松、易剝落。在人工汗液的腐蝕過程中，早期形成的腐蝕產物層會開裂，而裂紋末端界面的固相擴散決定了腐蝕反應的速率。
關鍵字: 黃銅合金；顯微組織；電化學；腐蝕行為
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The corrosion behaviours of imitate-gold Cu-Zn-Ni-Sn alloys in artificial seawater and perspiration were investigated by means of colour difference test, static corrosion measurement, scanning electron microscopy analysis, electrochemical impedance measurement and X-ray photoelectron spectroscopy analysis. The corrosion product layer of the alloy in the early stage of artificial seawater corrosion is mainly composed of relatively dense Cu2O and some oxidation products with good corrosion resistance, such as ZnO, Zn5(CO3)2(OH)6 and Zn5(OH)8Cl2？H2O. The mass transfer at the interface on both sides of the oxide film is the rate-determining step of corrosion reaction. The main corrosion products at the initial stage of corrosion in artificial sweat are mainly loose CuO and unstable SnO, which made the corrosion product film loose and easy to peel off. In the corrosion process of artificial perspiration, the corrosion product layer forms in the early stage will crack, and the solid phase diffusion at the crack end interface determined the rate of the corrosion reaction.
Key words: brass alloy; microstructure; electrochemistry; corrosion behaviour
