US 2026/0275121 A1Published application

Composition of anti-corrosion coating

AssigneeCia. Industrial H. Carlos Schneider

InventorsMarcelo DA SILVA GOMES, Filipe POSSAMAI DE SOUZA, Luidgi PAOLO PEDRAZZA

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention belongs to the field of compositions for coating, more specifically, it deals with a composition of a multilayer anticorrosive coating (R) with at least three layers, the base layer (1) being electrolytic or organometallic, a nanoceramic sealant as an intermediate layer (2), and an outer layer (3) of epoxy resin or polyester-polyurethane. The base layer (1) consists of an organometallic dispersion based on zinc and aluminum alloys or a base of zinc or zinc alloys applied electrolytically to a metallic surface (not pictured). Thus, in addition to having an affordable cost, the (R) coating of this invention has efficiency against corrosion by acid attack much higher than the coatings of the state of the art, that is, it has resistance to at least 40 test cycles of Kesternich AHT 2.0 S.

Claims5

Dependent claims

1- A composition of a coating, where the referred coating (R) is configured by at least one base layer (1), an intermediate layer (2) and an outer layer (3), applied to the same metallic piece, in which the base layer (1) comprises:

an organometallic dispersion based on zinc and aluminium alloys, or
a base of zinc or zinc alloys applied electrolytically to the metal surface
the aqueous intermediate layer (2) comprising silicon oxide nanoparticles up to 50 nanometers and further comprising the following compounds as a percentage by weight:
15% to 32% of Colloidal Silica;
from 2.4% to 8% of 2-Butoxyethanol;
from 0% to 10% of Methanol;
from 50% to 70% of Water;
from 0% to 6% of Tetraethoxysilane;
from 0% to 2% polyvinyl alcohol;
characterized by the outer layer (3) comprising the following compounds as a percentage by weight:
from 53 to 63% epoxy resin;
from 11 to 13% titanium oxide;
7 to 9% metallic aluminum;
6 to 8% silicates;
or an outer layer (3) comprising solvent-based polyester-polyurethane resin with the following compounds as a percentage by weight:
20 to <30% propylene glycol methyl ether acetate (PMA);
from 10 to <20% of 1-methoxy 2-propanol;
from 1 to <3% Isopropanol;
1 to <3% n-butyl acetate;
<1% of 1-ethyl-2-pyrrolidinone;
<1% methyl isobutyl ketone (MIBK);
<1% Naphthalene;
<1% Toluene;
and
60 to <70% of other compounds below reported levels.

22 more elements