(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用色差测试、电化学测试、静态腐蚀测试、扫描电镜分析、电化学阻抗测试和X射线光电子能谱分析等方法，研究仿金Cu-Zn-Ni-Sn合金在人工海水和人工汗液中的腐蚀行为。合金在人工海水腐蚀初期的腐蚀产物层主要为较为致密的Cu2O和具有良好耐腐蚀性能的ZnO、Zn5(CO3)2(OH)6和 Zn5(OH)8Cl2？H2O等氧化产物，该氧化膜两侧界面的传质过程是腐蚀反应发生的决速步骤。在人工汗液中腐蚀初期的主要腐蚀产物主要为疏松的CuO和不稳定的SnO，使其腐蚀产物膜疏松、易剥落。在人工汗液的腐蚀过程中，早期形成的腐蚀产物层会开裂，而裂纹末端界面的固相扩散决定了腐蚀反应的速率。
关键字: 黄铜合金；显微组织；电化学；腐蚀行为
（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
