Rust proofing treatment liquid for threaded part, method for producing rust-proofed threaded part, and rust-proofed threaded part
US11111946B2 · kind B2 · utility
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Key dates
| Filing date | Dec 19, 2018 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Dec 19, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C22/62
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Threaded parts such as bolts are rust-proofed by using a treatment liquid including a binder resin containing silica and at least one of a modified epoxy resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain and a modified acrylic resin obtained by graft polymerization using a carboxylic acid-containing acrylic polymer as a side chain. By using this treatment liquid, coating treatment can be carried out at one time without need to use an organic solvent. There is an advantage that the friction coefficient does not increase even when tightening is repeated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.