Activation of self-passivating metals using reagent coatings for low temperature nitrocarburization
AssigneeSwagelok Company
InventorsChristina Semkow, Cyprian Adair William Illing, Peter C. Williams, Wayne Ostrosky
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Abstract
A method for treating a workpiece made of self-passivating metal and having a Beilby layer including applying a coating to a surface of the workpiece, the coating including a reagent, treating the coating to thermally alter the reagent, wherein the thermal altering of the reagent activates and/or hardens the surface.
Claims44
A method for treating a workpiece made of self-passivating metal and having a Beilby layer including:
- applying a coating to at least a portion of a surface of the workpiece, the coating including a reagent;
- and
- treating the coating to thermally alter the reagent, wherein the thermal altering of the reagent activates the surface for hardening.
A coating composition for treating a workpiece made of self-passivating metal and having a Beilby layer comprising:
- a reagent vehicle;
- and
- a reagent comprising a guanidine [HNC(NH2)2] moiety and associated with HCl to activate the Beilby layer for low temperature interstitial surface hardening.
A method for treating a workpiece made of self-passivating metal and having a Beilby layer including:
- applying a coating to at least a portion of a surface of the workpiece, wherein the coating substantially prevents carburizing, nitriding, or nitrocarburizing of the portion;
- and
- one or more of carburizing, nitriding, or nitrocarburizing the workpiece to harden the workpiece.
Dependencies are inferred from the claim text.