US2008116055A1PendingUtilityA1

Laser passivation of metal surfaces

53
Individually held — no corporate assignee on recordPriority: Nov 17, 2006Filed: Nov 17, 2006Published: May 22, 2008
Est. expiryNov 17, 2026(~0.3 yrs left)· nominal 20-yr term from priority
Inventors:Warran Boyd LinetonJason Henderlong
C23C 22/00
53
PatentIndex Score
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Claims

Abstract

A method of using laser energy for treating a metal work-piece to modify chemical properties of a surface of the metal work-piece. The method includes the step of applying a material to a surface of a metal work-piece. The material is corrosive with respect to the surface. The method also includes the step of improving a resistance to corrosion of the surface by initiating a chemical reaction between the corrosive material and the surface with a laser.

Claims

exact text as granted — not AI-modified
1 . A method of using laser energy for treating a metal work-piece to modify chemical properties of a surface of the metal work-piece comprising the steps of:
 applying a material to a surface of a metal work-piece wherein the material is corrosive with respect to the surface; and   improving a resistance to corrosion of the surface by initiating a chemical reaction between the corrosive material and the surface with a laser.   
     
     
         2 . The method of  claim 1  wherein said applying step is further defined as:
 spraying a solution of water and at least one of sodium nitrate, sodium nitrite, potassium nitrate, and potassium nitrite on the surface; and   drying said solution prior to said improving step.   
     
     
         3 . The method of  claim 1  wherein said applying step is further defined as:
 submerging the surface in a solution of water and at least one of sodium nitrate, sodium nitrite, potassium nitrate, and potassium nitrite.   
     
     
         4 . The method of  claim 1  further comprising the step of:
 combining a surfactant with the material prior to said applying step.   
     
     
         5 . The method of  claim 1  wherein said improving step includes the step of:
 directing a diode laser at the surface.   
     
     
         6 . The method of  claim 1  wherein said applying step and said improving step are further defined as occurring concurrently. 
     
     
         7 . The method of  claim 1  wherein said applying step is further defined as:
 applying a non-hazardous material to the surface of the metal work-piece wherein the material is corrosive with respect to the surface.   
     
     
         8 . The method of  claim 1  wherein said improving step is further defined as:
 forming a chemically converted layer at the surface integral with the metal work-piece.

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