| 摘要 |
<p>A flux composition for treating a metal surface comprises (a) more than 40 and less than 70 weight % zinc chloride, (b) 10 to 30 weight % ammonium chloride, (c) more than 6 and less than 30 weight % of a set of at least two alkali metal chlorides including sodium chloride and potassium chloride, (d) from 0 to 2 weight % lead chloride, and (e) from 0 to 15 weight % tin chloride. The KCl:NaCI weight ratio of the set of at least two alkali metal chlorides ranges from 2.0 to 8.0. A fluxing bath comprising this flux composition dissolved in water for use in galvanizing processes is also described. The galvanisation process may be a batch or continuous process. It is particularly well suited for galvanising ferrous materials including iron and steel, particularly metal articles such as iron or steel long products and flat products including wires, plates, coils, rods, reinforcing bars, tubes, strips and sheets. The galvanising bath may comprise from 4 to 24 wt % aluminium, from 0.5 to 6 wt % magnesium, and balance zinc.</p> |
