| 摘要 |
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 temperature between about 750 DEG F. and about 1200 DEG F. for a period between about 1 and about 5 hours, followed by exposure to a second atmosphere containing nitrogen and water at a temperature between about 750 DEG F. and about 1200 DEG 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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