Wire Continuous Hot-dip Process, Organization And Performance Of Aluminum

Hot-dip Aluminizing (HDA) is one of the most economical techniques for coating large tonnage of steel wires. In the process, the pretreated steel wire was dipped in the molten metal of aluminum and passed through the coating bath. Then the wire was coated with aluminum. The intermetallic compounds of aluminum and iron formed at the interface layer between the coating and the substrate. The thin diffusion layer gave a strong metallurgical bond between the coating and the steel wire.In this thesis, preliminary attention has been paid on the surface pretreatment of the steel wire and the optimum selection of promotion flux. The kinetics of the thickness change during HDA, the formation mechanism of the coating, its microstructure and properties had been investigated.A kind of flux of 6%KF+4%NaCl solution was used. Hot dipped 0.14%C steel wire and 0.21%C steel wire were studied through V-shaped procedure. The results show that the best parameter of hot dip aluminizing are the temperatures of the bath between 680-710 and the travelling speed <20m/min of steel wire. It also show that the thickness of aluminum layer and the diffusion layer are changed with the speed of steel wire. The corrosion resistance was investigated by compared the aluminized wire with the galvanized wire and the steel wire. The electrical and corrosion resistance of aluminized wire are better.The research of the hot-dip aluminizing provides the necessary information for the further development of AS composite wire. In addition, It is very available for the advanced manufacture technology of the composite materials.