Cu-Zn-Al形状记忆合金在模拟宫腔液中的腐蚀行为

采用化学失重法、电化学方法和原子吸收光谱法研究了紫铜、Cu-Zn-Al形状记忆合金和Cu-Zn-Al合金在模拟宫腔液中的腐蚀行为.结果表明, 模拟宫腔液中紫铜、Cu-Zn-Al形状记忆合金和Cu-Zn-Al合金的腐蚀历程受阴极氧去极化步骤控制.Cu-Zn-Al形状记忆合金和Cu-Zn-Al合金由于铝的表面离子化倾向比锌的大, 优先形成致密坚固的保护性氧化铝膜, 降低了腐蚀速率.在模拟宫腔液中发现Cu-Zn-Al形状记忆合金和Cu-Zn-Al合金发生脱铝腐蚀, Cl-参与腐蚀反应历程, 促进脱铝腐蚀的进行.白蛋白与氧的竞争吸附加速了阳极溶解, 使紫铜、Cu-Zn-Al形状记忆合金和Cu-Zn-Al合金的阳极活性电流密度随白蛋白浓度的上升而增加.

Corrosion behavior of Cu-Zn-Al shape memory alloy in simulated uterine fluid

Chemical weight-loss method, electrochemical test technology and atomic adsorption spectrometry were used to investigate corrosion behaviors of copper, Cu-Zn-Al shape memory alloy(SMA and Cu-Zn-Al alloy in simulated uterine fluid. The results show that corrosion process of copper, Cu-Zn-Al SMA and Cu-Zn-Al alloy in simulated uterine fluid is controlled by cathodic depolarization of oxygen. The corrosion rates of Cu-Zn-Al SMA and Cu-Zn-Al alloy are lower than that of copper result from ionization tendency of aluminum exceeding zinc, forming compact solidity protective alumina film. Dealuminufication corrosion occurs in Cu-Zn-Al SMA and Cu-Zn-Al alloy. Cl~- takes part in the dealuminufication corrosion process and accelerated this reaction. Competitive adsorption of albumin and oxygen accelerate anodic reaction, which lead anodic active currents of copper and Cu-Zn-Al SMA to rise with increasing albumin concentration.