Galvanized steel for use in vehicle body

Details Galvanized steel for use in vehicle body Galvanized steel for use in vehicle body

C - Chemistry, Metallurgy

23

C

C23C 22/36 (2006.01) C23C 22/50 (2006.01)

Patent

CA 2387967

A galvanized steel plate for use in a vehicle body, having corrosion resistance and workability that are well-balanced and being suitable for outer plates of a vehicle body is provided. The plate includes a galvanized steel plate having a zinc coating plated on both surfaces thereof; a zinc phosphate coating layer formed on one of the surfaces of the plate that serves as an outer surface of a vehicle body; and a phosphate-containing composite coating formed on the other of the surfaces that serves as an inner surface of a vehicle body, the composite coating being composed of a zinc phosphate coating layer and a phosphate coating containing Mg. The phosphate-containing composite coating preferably contains 2wt% or more of Mg, and is preferably applied in an amount greater than or equal to 0.5g/m2.

Cette invention concerne une tôle d'acier galvanisé pouvant s'utiliser dans la carrosserie d'un véhicule et convenant bien pour des panneaux extérieurs de carrosserie compte tenu du bon équilibre qui la caractérise entre résistance à la corrosion et aptitude au façonnage. Cette tôle est faite d'acier galvanisé zingué sur les deux faces. Sur l'une des faces de la tôle, on trouve une couche de phosphate de zinc qui constitue la surface extérieure de la carrosserie. L'autre face, qui reçoit une couche de matériau composite renfermant un phosphate, forme la surface intérieure de la carrosserie. Ce matériau composite est constitué par une couche de phosphate de zinc et d'une couche de phosphate renfermant du manganèse. Le revêtement composite renfermant du phosphate contient de préférence 2 % ou plus en poids de manganèse et est appliqué de préférence à raison d'au moins 0,5g par m<2>.

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