| 摘要 |
The present invention relates to a water based flux for hot-dip batch galvanising of steel. Steel articles are hereby subjected to rapid heating, in particular when using a zinc-bath composition with a high wetting ability towards steel. It is an aim of the present invention to alleviate the thermal stress problem by using fluxes which, upon dipping, reduce the heat transfer coefficient between the steel and the zinc melt. The invented flux comprises a total of 200 to 600 g/l of ZnC12 and NH4C1, with a NH4C1 to ZnC12 molar ratio of 1.7 to 3.3, and is characterised in that it further comprises 8 to 80 g/l A1C13. |
