Novel Al-Sn-Bi anodes with and without lanthanum （La） were prepared.To evaluate the corrosion properties of the anodes,constant current and dynamic loop tests were carried out to determine its efficiency and corrosi...Novel Al-Sn-Bi anodes with and without lanthanum （La） were prepared.To evaluate the corrosion properties of the anodes,constant current and dynamic loop tests were carried out to determine its efficiency and corrosion rate.Optical microscopy （OM）,transmission electron microscopy （TEM） and energy spectrum analysis techniques were used to examine and analyze microstructure and corrosion behavior of the specimens.The result showed that the Al-Sn-Bi anodes with La additions revealed higher current efficiency and anticorrosion in artificial environment.Segregation phase of anodes with La additions got more homogenous than that without La additions.Its grains were fined and the amount of segregation Fe-phase was reduced.展开更多
Nanometre-sized （hereafter nano-） Pb particles embedded in an Al matrix are prepared by ball milling. It is found that the size of nano-Pb particles was decreased with increasing milling time. The melting behaviour ...Nanometre-sized （hereafter nano-） Pb particles embedded in an Al matrix are prepared by ball milling. It is found that the size of nano-Pb particles was decreased with increasing milling time. The melting behaviour of nano-Pb particles embedded in the Al matrix is studied by means of dynamic mechanical analysis, and a single internal friction peak in the vicinity of Pb melting temperature is observed. The onset temperature of the peak moves to lower temperature with the decrease of particles size and the internal friction peak height is increased, which indicates a size-dependent melting behaviour of nano-Pb particles. It is suggested that the size-dependent melting behaviour is associated with surface melting.展开更多
基金the Industrial Investment Fund of General Research Institute for Non-ferrous Metals for financial support
文摘Novel Al-Sn-Bi anodes with and without lanthanum （La） were prepared.To evaluate the corrosion properties of the anodes,constant current and dynamic loop tests were carried out to determine its efficiency and corrosion rate.Optical microscopy （OM）,transmission electron microscopy （TEM） and energy spectrum analysis techniques were used to examine and analyze microstructure and corrosion behavior of the specimens.The result showed that the Al-Sn-Bi anodes with La additions revealed higher current efficiency and anticorrosion in artificial environment.Segregation phase of anodes with La additions got more homogenous than that without La additions.Its grains were fined and the amount of segregation Fe-phase was reduced.
基金Supported by the National Natural Science Foundation of China under Grant Nos 19974052, 50172048, 10374090, and 10274085, the National Key Basic Research and Development Programme of China under Grant No 2005CB623603, the Hundred Talent Programme of Chinese Academy of Sciences, and the Talent Foundation of Anhui Province under Grant No 2002Z020. The authors are grateful to Professor J. Weissmuller and Professor G. Wilde for their encouragement and helpful discussion.
文摘Nanometre-sized （hereafter nano-） Pb particles embedded in an Al matrix are prepared by ball milling. It is found that the size of nano-Pb particles was decreased with increasing milling time. The melting behaviour of nano-Pb particles embedded in the Al matrix is studied by means of dynamic mechanical analysis, and a single internal friction peak in the vicinity of Pb melting temperature is observed. The onset temperature of the peak moves to lower temperature with the decrease of particles size and the internal friction peak height is increased, which indicates a size-dependent melting behaviour of nano-Pb particles. It is suggested that the size-dependent melting behaviour is associated with surface melting.
