中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 9 September 2010 |
（1. Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia,
via Branze 38, 25123 Brescia, Italy;
2. Aachener Verfahrenstechnik, Chair of Mechanical Unit Operations,
RWTH Aachen University, Turmstr. 46, 52056 Aachen, Germany）
Abstract:The application of semisolid process was investigated on Pb-Sb alloys that are normally used for metallic parts in car batteries, in order to increase their mechanical properties and corrosion resistance. The semisolid behaviour of a Pb-4%Sb alloy was analysed by means of rheological and calorimetry differential scanning experiments. The alloy was melted, treated by ultrasound to obtain the semisolid state and then poured into permanent moulds. Some of these samples were also heated in semisolid temperature range and injected in thixo-casting apparatus. Both poured and injected samples were characterized by metallographic analysis, mechanical test and electrochemical corrosion experiments. The results show an improvement of mechanical and corrosion resistance with respect to samples obtained by conventional casting technique.
Key words: Pb-based alloys; semisolid metal; corrosion resistance; viscosity
