Stock material or miscellaneous articles – All metal or with adjacent metals – Composite; i.e. – plural – adjacent – spatially distinct metal...
Patent
1988-09-30
1990-08-21
Rosenberg, Peter D.
Stock material or miscellaneous articles
All metal or with adjacent metals
Composite; i.e., plural, adjacent, spatially distinct metal...
B32B 1508
Patent
active
049505521
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.
REFERENCES:
patent: 3677908 (1972-07-01), Sperl
patent: 4800134 (1989-01-01), Izaki
"Theory of Corrosion and Protection of Metals--The Science of Corrision", by N. D. Tomashov, translaed and edited by Boris H. Tydell et al., The Macmillan Company, New York, 1966, title page, flyleaf, pp. 287-293, 356-361, and 579-581.
"The Corrosion and Oxidation of Metals: First Supplementary Volume", by Ulick R. Evans, St. Martin's Press, New York, 1968, title page, flyleaf, pp. 143-145, 221-229, 246-257, and 375-379.
Amend William E.
Kitz Kevin R.
Kondzella Michael A.
Lambert Howard R.
Rosenberg Peter D.
Union Oil Company of California
Wirzbicki Gregory F.
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