Method for protecting stainless steel pipe and the like in geothermal brine service from stress corrosion cracking, and articles made thereby
US4950552A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1988 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Sep 30, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12569
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A method is provided for protecting flow-conducting elements, such as pipe, fittings, valves, and vessels which are constructed of austenitic and duplex stainless steel alloy materials and which are used in hot geothermal brine service from stress cracking caused by small amounts of the brine leaking onto exterior surfaces of such flow-conducting elements. According to the method, residual stress regions of the flow-conducting elements are thermally-sprayed with a metal such as mild steel, aluminum, magnesium, or zinc, which is anodic relative to the stainless steel, to provide a metal coating having a preferred thickness of between about 10 mils and about 20 mils, the preferred metal to be thermally-sprayed onto the stainless steel being mild steel. A metallized article made by the present method is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.