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Laser Surface Treatment of Stainless Steels with Colored Marking for Visibility

IP.com Disclosure Number: IPCOM000249185D
Publication Date: 2017-Feb-08
Document File: 1 page(s) / 514K

Publishing Venue

The IP.com Prior Art Database

Abstract

While experimenting with process parameters for laser dark marking of stainless steel, a spectral refraction was created at lower power levels than needed for dark marking.

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Laser Surface Treatment of Stainless Steels with Colored Marking for Visibility  

Summary While experimenting with process parameters for laser  dark marking of stainless steel, a spectral refraction was  created at lower power levels than needed for dark  marking. 

 

Description The process for making laser dark mark surfaces  requires well directed and focused laser light on the  surface of a metal with sufficient energy to turn the  Chrome surface content to Cr2 which creates a black 

and non‐reflective surface.  The repeated creation of these hot spots in a pattern is what can create  desired black marking on a stainless steel surface. 

When a lower amount of energy is  used, the laser acts as a polishing  mechanism to remove high spots and  fill low spots on the surface.  Creation  of these small melt spots is actually  creating multiple shallow highly  reflective mirrors.  The light hitting  the mirror array acts as multiple  reflection points that are equally  spaced and a small amount of  refraction.  With multiple spots, this  creates a refraction pattern that is  similar to what is seen when we observe light reflecting off of the many small water droplet “lenses” of  a rainbow. 

 

Disclosed Anonymously