| |
| | Process for adjusting the composition of a zinc alloy used in the galvanization of steel - Patent 4439397 |
 | | An alloy suitable for use in a process for adjusting the composition of a zinc alloy suitable for the dip galvanization of steel, which alloy consists essentially of from 5,000 to 50,000 ppm by weight of aluminum, and beryllium in a weight ratio to the aluminum of 1/11.5 to 1/24, balance essentially zinc. |
 | | The addition of aluminium and magnesium to the galvanisation bath presents special difficulties associated with the low density of these metals, with their high oxidisability, and, to a certain extent, with the fact that these metals are not liquid at the temperature of the molten zinc baths, namely at about 450.degree. |
 | | This oxidation, which is slow on a bath not being used, on which a layer of protective oxides forms, is greatly accelerated by the action of the galvanising fluxes (zinc chloride and ammonium chloride) and of the air drawn in during immersion of the articles to be galvanised. |
| www.freepatentsonline.com /4439397.html (4048 words) |
|