Multilayer, corrosion-resistant finish and method

B - Operations – Transporting – 32 – B

Patent

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B32B 15/08 (2006.01)

Patent

CA 2614900

The present invention provides a black, chrome-free, multilayer corrosion protection finish designed to meet extended corrosion properties. This corrosion-resistant finish is engineered to meet a minimum of 500 salt spray testing hours to white corrosion, and 1500 salt spray testing hours to red corrosion when tested to ASTM B 117 standards. It is also designed to comply with the European Union Directive on End of Life Vehicles. This multilayer system is designed for use on automotive body sheet steel, automotive underbody parts, automotive under-hood parts, and some automotive interior parts specifying a gloss requirement greater than 4. This chrome-free, multilayer finish is a combination of a zinc-iron electroplated substrate, a non-electrolytic phosphate crystal conversion layer using orthophosphoric acid, and a Xylan / Teflon fluorocarbon sealer coating to form a three layer total corrosion protection system.

L'invention concerne une finition de protection anticorrosion multicouche noire, sans chrome, qui offre plusieurs propriétés anticorrosion étendues. Cette finition est conçue pour résister au minimum à 500 heures de pulvérisation test de sel s'agissant de la corrosion blanche, et à 1 500 heures de pulvérisation test de sel s'agissant de la corrosion rouge, en essai conduit selon les normes ASTM B 117 standards. Ladite finition est conforme à la Directive européenne sur les véhicules en fin de vie. Il s'agit d'un système multicouche destiné à être utilisé sur des feuilles d'acier de carrosserie, des éléments de châssis, des éléments sous le capot, et quelques éléments d'intérieur nécessitant un brillant supérieur à 4. La finition en question est une combinaison de substrat galvanisé en zinc-fer, de couche de conversion en cristal de phosphate non électrolytique faisant appel à de l'acide orthophosphorique, et de revêtement étanche fluorocarboné Xylane/Téflon donnant un système de protection anticorrosion global à trois couches.

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