MULTILAYER DOUBLE-SIDED PROTECTIVE COATING OF STEEL FLAT PRODUCTS Russian patent published in 2022 - IPC C23C28/00 C25D3/22 

FIELD: polymer coatings.

SUBSTANCE: invention relates to protective multifunctional corrosion and chemical resistant polymer coatings on galvanized steel flat products. Multilayer double-sided protective coating of steel flat products contains a zinc galvanic layer, made on both sides of the flat products, a passivation layer, made on the surface of the zinc galvanic layer on both sides of the mentioned rental, a primer layer, made on top of the passivation layer on both sides of the said rental, and a protective layer. polymeric material based on polyvinylidene fluoride, made on top of each primer layer. Zinc electroplated layer additionally contains from 2 to 20 wt.% Ni, its thickness is from 4 to 12 mcm on each side. The difference in thickness of each zinc galvanized layer and layers among themselves does not exceed 20%. The passivating layer is made 1-2 mcm thick. The primer layer is made on the basis of polyester or polyurethane resin with a thickness of 5-15 microns. The layer of protective polymer material is made on the basis of a polymer composition containing from 85 to 90 wt.% polyvinylidene fluoride and has a thickness of 20-35 microns on each side.

EFFECT: expansion of the arsenal of technical means of double-sided protective coatings of steel flat products due to the implementation of a multilayer double-sided protective coating of steel flat products, which makes it possible to obtain high corrosion and chemical resistance along with the implementation of a combination of consumer properties with high values ​​of technical characteristics.

1 cl, 5 ex