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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 3    June 2001

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Activities of binary baths
with 1% solute as standard states
LE Qi-chi(乐启炽), LU Gui-min(路贵民),CUI Jian-zhong(崔建忠)

School of Materials and Metallurgy,
Northeastern University, Shenyang 110006, P.R.China

Abstract: 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)≤40% for Zn-Mn alloy,w (Ti)≤8% for Zn-Ti alloy), the two binary baths can all be treated as ideal dilute solutions.

 

Key words:  activities; colored hot dip galvanization; solution

ISSN 1672-7029
CN 43-1423/U

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