Coating composition for metal substrates

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/10 (2006.01) C09D 1/02 (2006.01) C09D 7/12 (2006.01)

Patent

CA 2684374

Coating composition suitable for coating a metal, preferably steel, substrate which is intended to be fabricated and overcoated, said composition comprising: i) zinc powder and/or a zinc alloy and ii) a modified silica sol comprising colloidal silica particles modified with 6-40 wt% of one or more silane compounds, based on the combined dry weight of silane compound(s)and colloidal silica particles, and being obtainable by adding said silane compound(s) to a silica sol with a rate of not more than 20silane molecules per nm2 colloidal silica surface per hour.This coating composition has a relatively long pot life, good white rust resistance, and good film properties.

L'invention porte sur une composition de revêtement appropriée pour revêtir un substrat de métal, de préférence en acier, qui est destiné à être fabriqué et doté d'une couche de finition. Cette composition comprend (i) de la poudre de zinc et/ou un alliage de zinc et (ii) un sol de silice modifié comprenant des particules de silice colloïdale modifiées par 6-40 % en poids d'un ou de plusieurs composés de silane, sur la base du poids sec combiné des composés de silane et des particules de silice colloïdale, et pouvant être obtenues par addition dudit ou desdits composés de type silane à un sol de silice à raison de 20 molécules de silane au maximum par nm2 de surface de silice colloïdale par heure. Cette composition de revêtement a une durée en pot relativement longue, une bonne résistance à la rouille blanche et de bonnes propriétés filmogènes.

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