| 摘要 |
A galvanisation process for steel sheets, in particular assembled sheets such as structural parts for motor vehicles, distinguished by a particular silicon and phosphorus content, is characterised in that in a first pretreatment stage, the part to be treated is dipped in a pretreatment bath called a fluxing bath containing between 300 and 350 g/I of zinc chloride and between 100 and 150 g/I of ammonium chloride at a temperature in the order of 38‹C, so as to coat this part with an interface layer, and then the part thus coated is dipped in a galvanisation bath containing between 0.05% and 0.20% by weight of aluminium at a temperature of 440 to 450‹C, so as to obtain an even coating approximately between 10 and 40 Ám thick. |
