PASSIVATION OF METALS
1,198,650. Passivating powder or porous ferrous metal. ESSO RESEARCH & ENGINEERING CO. Sept. 11, 1967 [Sept. 20, 1966], No.41464/67. Heading C7U. Powdered or compacted porous iron such as produced by a fluidized iron ore reduction process is passivated by oxidation above 1058 F. in a gaseous at...
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