Back to results
US 9,068,271 B2Granted
Electrochemical nitridation of metal surfaces
AssigneeAlliance for Sustainable Energy, LLC
InventorsHeli Wang, John A. Turner
Life of this patent
Estimating the term…
Abstract
Electrochemical nitridation of metals and the produced metals are disclosed. An exemplary method of electrochemical nitridation of metals comprises providing an electrochemical solution at low temperature. The method also comprises providing a three-electrode potentiostat system. The method also comprises stabilizing the three-electrode potentiostat system at open circuit potential. The method also comprises applying a cathodic potential to a metal.
Claims15
A method of electrochemical nitridation of a metal, the method comprising:
- providing a potentiostat system comprising a potentiostat, a counter electrode, a reference electrode, and a working electrode comprising the metal;
- immersing the working electrode, the counter electrode, and the reference electrode in a solution, wherein the solution consists of nitric acid and at least one nitrate;
- and
- applying a cathodic potential, whereby the metal is nitrided with a nitride surface layer.
1 more element
A method of electrochemical nitridation of a metal, the method comprising:
- providing a potentiostat system comprising a potentiostat, a working electrode comprising the metal, a platinum counter electrode, and a reference electrode comprising a saturated calomel electrode, wherein the metal comprises at least one of Cr, Al, Fe, or Ti;
- immersing the working electrode, the counter electrode, and the reference electrode in a solution at a temperature ranging from about 0° C. to about 100° C., wherein the solution consists of nitric acid and at least one of NaNO3, NH4NO3, or Mg(NO3)2, and the solution is adjusted to a pH ranging from about zero to three;
- stabilizing the potentiostat system at an open circuit potential for a first period of time ranging from about 30 seconds to about 10 minutes;
- and
- applying a cathodic potential ranging from about −0.7V to about −1V for a second period of time ranging from about 0.5 hours to about 8 hours, whereby the metal is nitrided with a nitride surface layer ranging in thickness from about 2 nm to about 5 nm.
2 more elements
Dependencies are inferred from the claim text.