Activities of binary baths with 1% solute as standard states

The relationships of activities with 1% solute as standard state and mass fraction of solute, and hot dip temperature, were given on the base of Miedema’s model, Tanaka expression, some basic thermodynamic relationships; and discussion was carried out on Zn Mn and Zn Ti binary alloys by calculation, in which varied colors can be achieved onthe hot dip steel sheets. The results indicate that the activity of solute shows positive deviation relative to Henry’s law for both Zn Mn and Zn Ti binary dilute solution. The degree of deviation increases with increasing solute and decreases with increasing bath temperature. As the solution is very dilute solution ( w (Mn)≤40% for Zn Mn alloy, w (Ti)≤8% for Zn Ti alloy), the two binary baths can all be treated as ideal dilute solutions. [

The relationships of activities with 1% solute as standard state and mass fraction of solute, and hot-dip temperature, were given on the base of Miedema's model, Tanaka expression, some basic thermodynamic relationships; and discussion was carried out on Zn-Mn and Zn-Ti binary alloys by calculation, in which varied colors can be achieved on the hot-dip steel sheets. The results indicate that the activity of solute shows positive deviation relative to Henry's law for both Zn-Mn and Zn-Ti binary dilute solution. The degree of deviation increases with increasing solute and decreases with increasing bath temperature. As the solution is very dilute solution ( w(Mn)less than or equal to 40% for Zn-Mn alloy, w (Ti)less than or equal to8% for Zn-Ti alloy), the two binary baths can all be treated as ideal dilute solutions.