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Stainless steel engraving and corrosion resistance

Category: Metal engraving
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Posted: 19-03-2014 17:19
Views: 2685
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Synopsis:

Corrosion and chemical resistance for marked / engraved stainless steel. "laser engraving" of stainless is fusion at high temperature by laser resulting in black permanent image on steel.

Corrosion and chemical resistance for marked / engraved stainless steel. "laser engraving" of stainless is fusion at high temperature by laser resulting in black permanent image on steel.

Laser marks were made on type 304 stainless steel tags
similar results for type 316  stainless steel
     
Tags were totally immersed in the test solutions.
       
  Exposure Time    
       
Organic Solvents   1 Hour 12 Hours 24 Hours 1 Week
Gasoline   No effect No effect No effect No effect
Limonene   No effect No effect No effect No effect
Methyl Ethyl Ketone   No effect No effect No effect No effect
N-Butanol   No effect No effect No effect No effect
Mineral Spirits   No effect No effect No effect No effect
Xylene   No effect No effect No effect No effect
Acetone   No effect No effect No effect No effect
Propylene Carbonate   No effect No effect No effect No effect
Ethanol   No effect No effect No effect No effect
DMSO   No effect No effect No effect No effect
Motor Oil   No effect No effect No effect No effect
     
   
Acid/Bases  
Hydrochloric Acid 35%   No effect No effect Test stopped - see notes
Nitric Acid 68%   No effect No effect No effect No effect
Sulfuric Acid (conc.)   No effect No effect No effect No effect
Acetic Acid 99.5%   No effect No effect No effect No effect
Hydrogrn Peroxide 30%   No effect No effect No effect No effect
Sodium Hydroxide 25%   No effect No effect No effect No effect
Ammonium Hydroxide 20%   No effect No effect No effect No effect
   
   
Other  
Boiling H2O   Marks soaked in boiling water for 1 hr. - no effect
LN2 (Cold)   Marks dipped in liquid nitrogen - no effect
Flame (Hot)   Marks heated in a propane flame until cherry red - metal
  discolors, no effect on mark.
Hot/Cold Cycling   Marks heated red hot and immediately plunged in liquid nitrogen
  - metal discolors, no effect on mark
 
 
Notes:  
 
Hydrochloric acid testing:   - Acid dissolves the steel tag and was not run over 12 hrs. long
  - After 1 hr. acid dissolved 0.2767 gms off of steel tag (4.7%),
  laser mark was unaffected.
  - After 12 hrs. acid dissolved 1.8057 gms off of steel tag (30.6%),
  laser mark was unaffected, now having a distinctly raised feel.
 
Sulfuric acid testing:   - Acid discolors at approximately 96 hrs., mark appears to be
  slightly discolored.

 

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