| Abstract Scope |
Zinc coatings were obtained on sheet steel containing 0.08-0.14% C. Studies of the microstructure and phase composition showed that there are Γ,-, -, -phases. The , -phase has a finely dispersed structure and minimum thickness, which ensures the elasticity of the coating. The -, phase is lamellar crystallites oriented in the direction of heat removal during crystallization. On steels with 0.08% C, the - phase has a dendritic structure. On high-silicon steels (Si=0.8-2.0%), the - phase has a coarse-crystalline structure and makes up almost the entire coating. When galvanizing under FA charge conditions, δ1, G-phases, Fe2Al5 and FeAl3 are formed. Microstructure analysis showed that the zinc coating is formed uniformly. With increasing strip thickness and temperature, the amount of aluminum in the layer increases. Hardening allows obtaining zinc coatings alloyed with aluminum, nickel with corrosion resistance 25-35% greater than after galvanizing by the galvanic method. |