FLUORIDE-FREE FLUX COMPOSITIONS FOR HOT GALVANIZATION IN ALUMINIUM-MODIFIED ZINC BATHS

摘要

PCT No. PCT/BE87/00003 Sec. 371 Date Nov. 4, 1987 Sec. 102(e) Date Nov. 4, 1987 PCT Filed Mar. 3, 1987 PCT Pub. No. WO87/05337 PCT Pub. Date Sep. 11, 1987.The disclosed flux compositions contain by weight: from 80 to 90% of ZnCl2, from 10 to 20% of NH4Cl and, based on the weight of ZnCl2+NH4Cl, from 0.01 to 5% of a wetting agent, from 0 to 5% of a forming agent, from 0 to 5% of a soluble salt of rare earths. The flux compositions according to the invention may be used as galvanization flux in the dry process with baths containing more than 0.15% of aluminum, particularly for baths of galvanization alloy containing 5% of aluminum, 95% of zinc and Mischmetall additions.