The present invention is intended to provide an inorganic-organic composite-treated
zinc-plated steel sheet whose treated coatings do not contain any hazardous chromate
and which is excellent in corrosion resistance after alkaline degreasing and coating adhesion.
An inorganic-organic composite-treated zinc-plated steel sheet
- which has a zinc phosphate coating, in a coating weight of 0.3 to 5
g/m2, on the zinc-plated steel sheet surface and, thereon, a post-treatment
coating, in a coating weight of 0.01 to 1 g/m2, containing an organic
resin (A), a zirconium compound (B), an inorganic corrosion inhibitor (C) and an
organic corrosion inhibitor (D).
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