Process for continuous hot dip zinc coating of alminum profiles
US5529816A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C2/36
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An improved process is provided for forming a zinc-base alloy coating on an aluminum alloy profile, such as a tube or microtube used in the assembling and brazing of a heat exchanger which is suitable for automotive applications. The process of the present invention is a continuous, high speed coating technique which can utilize aluminum alloy profiles on which an aluminum oxide layer is present. Accordingly, the present invention encompasses an operation by which the aluminum oxide layer is removed so as to enable the zinc-base alloy to metallurgically adhere to the surface of the aluminum alloy profile. The process of this invention also is capable of closely controlling the thickness of the zinc-base alloy coating, such that a sufficient but minimal amount of coating is present to furnish corrosion protection as well as provide sufficient filler metal for a subsequent soldering or low temperature brazing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.