Effect of zinc temperature on the properties of hot dip galvanized
Below 480°C, the zinc solution dissolves slowly on the matrix iron. When the temperature of the zinc solution is 430-480°C, the iron loss changes with time according to the parabolic law. Within this temperature range, the resulting alloy is dense and continuous. Therefore, the general hot-dip galvanizing temperature is controlled at about 450 °C. The temperature of 495 °C is the malignant dissolution temperature of zinc to iron. At this time, the coating is loose and is the forbidden zone of hot-dip galvanizing. When the temperature of zinc solution is 490-530 °C, the iron loss has a linear relationship with time. When the temperature of the zinc solution is above 530 °C (up to 580 °C), the reaction returns to the parabolic law. At about 540 °C, the zinc solution has a strong dissolving power for iron and can be used for gray iron castings. However, the higher the temperature, the greater the bonding ability of zinc and iron, the faster the alloy reacts, and the fluidity of zinc liq...