DRY PRE-TREATMENT PROCESS OF METALLIC SURFACES BEFORE ITS WELDING OR TIN-PLATING, UTILIZING A WATER STEAM-CONTAINING ATMOSPHERE.

摘要

The invention refers to a dry pre-conditioning or pre-treatment process of a metallic surface before its welding or tin-plating by an alloy, wherein the surface to be pre-conditioned is treated under a pressure close to atmospheric pressure, in gaseous atmosphere comprising excited or unstable species, and which is substantially free of electrically charged species, obtained from a primary gaseous mixture (8), and if necessary, also from an adjacent gaseous mixture (9, 10), the primary gaseous mixture being obtained in at least an excited or unstable gaseous species forming apparatus (11, 4, 12), wherein an initial gaseous mixture (7) comprising an inert gas and/or a reducing gas, and comprising an oxidant gaseous mixture including water steam, is transformed, and the adjacent gaseous mixture has not passed through said apparatus in said process.