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Laser passivation of metal surfaces

a metal surface and laser technology, applied in the direction of organic chemistry, coatings, chemistry apparatus and processes, etc., can solve the problem of surface corrosiveness, and achieve the effect of improving the surface corrosion resistan

Inactive Publication Date: 2008-05-22
FEDERAL MOGUL WORLD WIDE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent describes a way to use laser energy to treat a metal surface to change its chemical properties. A corrosive material is applied to the surface and then the laser is used to initiate a chemical reaction between the material and the surface, making it more resistant to corrosion. The technical effect is to improve the metal's ability to resist corrosion."

Problems solved by technology

The material is corrosive with respect to the surface.

Method used

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second embodiment

[0017]the invention is shown in FIGS. 3 and 4. In the second exemplary embodiment of the invention, the process starts at step 10a. At step 12a, a material 14a is applied to a surface 16a of a metal work-piece 18a. At step 20a, a laser 22a directs a beam 24b of energy at the surface 16a to initiate a chemical reaction and improve a corrosion resistance of the surface 16a. The steps 12a and 20a are performed concurrently. A solution of material 14a and water can be sprayed directly into the laser 22a and surface 16a interaction zone with a nozzle 28a. Performing the steps 12a and 20a concurrently can eliminate the need to dry the solution. The process ends at step 26a.

third embodiment

[0018]the invention is shown in FIGS. 5 and 6. In the third exemplary embodiment of the invention, the process starts at step 10b. At step 12b, a material 14b is applied to a surface 16b of a metal work-piece 18b. The step 12b is carried out by immersing or submerging the surface 16b in solution of the material 14b in water. At step 20b, a laser 20b directs a beam 24b of energy at the surface 16b to initiate a chemical reaction and improve a corrosion resistance of the surface 16b. The beam 24b penetrates the surface 30b of the solution to reach the surface 16b of the work-piece 18b. The process ends at step 26b.

[0019]The exemplary embodiments of the invention provide numerous advantages in the field of brake rotors and pistons. The chemically-altered surface 16 will not delaminate or peel off the metal work-piece 18. In addition, the process uses simple salts and not hazardous materials, such as heavy metals. Furthermore, the process is relatively quick, unlike immersion in salt b...

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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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to treatment of metal surfaces with a laser.[0003]2. Description of Related Art[0004]Lasers can rapidly heat a surface of a work-piece for adjusting properties of the surface. An absorptive coating can be applied to the surface to be heated to enhance the energy transfer from the laser to the work-piece. By using a laser to quickly heat a surface, conventional quenching by a gas or a liquid is unnecessary since only the shallow surface layer is heated. The part will actually self-quench, due to the extremely high heat differential between the surface layer heated by the laser and the remainder of the work-piece. In another process, such as carburizing or induction heating, a part may be heated in one operation, and, if necessary, be rapidly quenched by a gas or a liquid. Laser radiation can be generated by CO2, Excimer or Nd-YAG lasers, diode lasers; some of these lasers can achieve intensities of ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D11/00
CPCC23C22/00
Inventor LINETON, WARRAN B.HENDERLONG, JASON
Owner FEDERAL MOGUL WORLD WIDE