Pb_(36.32)Sn_(58.68)Bi_5合金不可逆液-液结构转变对耐腐蚀性能的影响  

Effect of Irreversibility of Liquid-Liquid Structure Transition on the Corrosion Resistance Property of Pb_(36.32)Sn_(58.68)Bi_5 Alloy

作　　者：何宏宇[1] 余瑾[1] 张先锋[1] 

机构地区：[1]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《中国铸造装备与技术》2010年第2期24-26,共3页China Foundry Machinery & Technology

摘　　要：Pb36.32Sn58.68Bi5合金在液相线以上数百度温度范围内发生液-液结构转变,而且具有不可逆性,液-液结构转变后的Pb36.32Sn58.68Bi5合金在空气中凝固时的组织明显细化。通过电化学腐蚀试验测得的极化曲线以及自腐蚀电位、极化电阻、自腐蚀电流等电化学参数,可以看出结构转变后的试样在酸、碱和盐中的耐腐蚀性能增强。Liquid-liquid structural transition （LLST） was suggested to occur in Pb36.32Sn58.68Bi5 alloys, within a certain range of several hundred degrees above the liquidus and the structural transition is irreversible, then the organization of irreversible LLST of Pb36.32Sn58.68Bi5 alloy in the air during solidification refined. In view of the parameters measured by tests such as the corrosion potential, polarization resistance and corrosion current, after LLST the corrosion resistance property of the samples in acid, alkali and salt has been enhanced.

关 键 词：Pb36.32Sn58.68Bi5合金 液-液结构转变 耐腐蚀性 

分 类 号：TG171[金属学及工艺—金属表面处理]