| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a flux composition for treating the metal surface of long steel products, including wires, flat plates, coils, bars, reinforcements, pipes, strip steels and steel sheets, before immersion in a zinc molten bath, in molten zinc plating or molten zinc coating.SOLUTION: A flux composition comprises (a) 40-70 wt.% of zinc chloride, (b) 10-30 wt.% of ammonium chloride, (c) 6-30 wt.% of a combination of at least two alkali metal chlorides including sodium chloride and potassium chloride, (d) 2 wt.% or lower of lead chloride and (e) 15 wt.% or lower of tin chloride, in a KCl/NaCl wt. ratio in the combination of alkali metal chlorides of 2.0-8.0. The flux composition can provide a protective coating layer of a thickness of 5-30μm. The combined content of lead chloride and tin chloride is at least 2.5 wt.%.</p> |
