Passivation & laser marking
Passivation & laser marking
(OP)
is there anyone with experience on passivation of martensitic & austenitic steels that need to be passivated and laser marked. I do know the procedured according to ASTM A 380 / A 967 but this conflicts with laser marking. I am lookin g foreward to get some input.
Regards
Frank
Regards
Frank





RE: Passivation & laser marking
RE: Passivation & laser marking
RE: Passivation & laser marking
Crank up the laser.
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Plymouth Tube
RE: Passivation & laser marking
RE: Passivation & laser marking
If you are pickling you can remove some metal. As stated above, passivation in itself will not cause loss of metal.
Depending on your service I see not problem with Laser Marking SS. I ran some bench scale corrosion tests on 304, 316, 430, and 17/4 SS in a very corrosive mixture of nitric and organic acids along with a couple of Huey tests. There was no evidence of any accelerated corrosion in the area of the Laser. In our process of manufacturing some of our component we reach extremely high temperature around areas where we are working.
If you have an very light oxidized surface, like you get from steam air oxidation, you have the most corrosion resistance surface as far as corrosion is concerned unless you are in highly reducing media.
RE: Passivation & laser marking
The good side is that without passivation laser markings are often seen with rust stains. Not good on stainless parts.
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Plymouth Tube
RE: Passivation & laser marking
actually I agree with the comment that passivation does not dissolve bulk material but as far as I know the reason for passivation is to remove disturbed oxides from the surface and generate a uniform oxide layer that guarantees optimum corrosion resistance. am I correct?
RE: Passivation & laser marking
Right now you are relying on oxides and dust for your marking. You need to burn into the surface a bit. It won't hurt the parts.
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Plymouth Tube
RE: Passivation & laser marking
RE: Passivation & laser marking
are you using straight nitric acid for passivation?
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Plymouth Tube