Anticorrosion coating method for zinc-plated steel structure
US8541061B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 25, 2006 |
| Grant date | Sep 24, 2013 |
| Priority date | — |
| Expiry date | Nov 30, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides an anticorrosion coating method for a galvanized steel structure, the method comprising applying an undercoating composition (I) to a cured thickness of 10 to 200 μm to a surface of a galvanized steel structure, and then applying thereto an overcoating composition (II) to a cured thickness of 100 to 1,500 μm; the undercoating composition (I) comprising an epoxy resin (A) having two or more epoxy groups per molecule, a specific amount of a resin (B) such as a urethane-modified epoxy resin, and an amine-based curing agent (C); the undercoating composition (I) having a shrinkage stress of 20 kg/cm2 or less when it is in the form of a 50 μm-thick cured coating film; and the overcoating composition (II) comprising an epoxy resin (D) having two or more epoxy groups per molecule, a specific amount of a flaky pigment (E), and an amine-based curing agent (F).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.