Shallow case hardening and corrosion inhibition process

Details Shallow case hardening and corrosion inhibition process Shallow case hardening and corrosion inhibition process

C - Chemistry, Metallurgy

21

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117/187, 148/25,

C21D 1/74 (2006.01) C21D 1/53 (2006.01) C21D 1/76 (2006.01) C23C 8/02 (2006.01) C23C 8/06 (2006.01) C23C 8/34 (2006.01) C23C 8/80 (2006.01)

Patent

CA 1277893

SHALLOW CASE HARDENING PROCESS ABSTRACT A method for improving the wear characteristics and corrosion resistance of a metal surface having the basic steps of: A. case hardening the metal surface by placing the metal in a fluidized bed and exposing it to a first atmosphere of nitrogen, ammonia and natural gas at a tempera- ture between about 750°F and about 1200°F for a period between about 1 and about 5 hours, followed by exposure to a second atmosphere containing nitrogen and water at a tempera- ture between about 750°F and about 1200°F; B. coating the metal with an aqueous coating composition consisting essentially of a polymeric additive and water; and C. allowing the coating composition retained on the metal to cure for a period between about 2 and about 48 hours.

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