Methods of anodizing the internal surface of heat transfer tubes
US12281861B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 25, 2021 |
| Grant date | Apr 22, 2025 |
| Priority date | — |
| Expiry date | Jun 12, 2043 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28F21/084
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Disclosed is a method of anodizing the interior surface of a heat transfer tube comprising placing a plurality of contact electrodes in electrical communication with, and along, an exterior surface of the heat transfer tube, inserting a counter electrode into an interior space of the heat transfer tube, providing an electrolytic solution to the interior space of the heat transfer tube, passing an electric current between the plurality of contact electrodes and the counter electrode through the electrolytic solution, forming an oxidation layer along the interior surface of the heat transfer tube, wherein the oxidation layer has an oxidation layer thickness that decreases along a length of the heat transfer tube, stopping the passage of the electric current, removing the electrolytic solution, and applying a sealing solution to a surface of the oxidation layer to form a sealed oxidation layer along the interior surface of the heat transfer tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.