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Stainless steel engraving and corrosion resistance
Category: Metal engraving
Author Name: Dennis Hughes
Posted: 19-03-2014 06:19
Views: 2101
Comments: 0 [Post]
Synopsis:
Author Name: Dennis Hughes
Posted: 19-03-2014 06:19
Views: 2101
Comments: 0 [Post]
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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