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Letter 9178
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Anna Berkovich |
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What if you etch your part carefully, I mean etch it just enough to strip the oxide film off? Do you think your part will loose the shine?
Mark Camilleri
- Malta
I think that a room temperature dip in nitric-HF acid will do quite nicely. Time and concentrations are important. Ratio needs to be about 14 to 1 and not lower than 10-1 or it will eventually pit, possibly from tramp ions.
James Watts
- Navarre, Florida
Dear friends,
Many thanks to all of you for your help. I really appreciated it. At the moment I'm testing an acid mixture HNO3-HF characterized by a very very low ratio, about 60 to 1, otherwise the brightness of the polished surface is lost (etching of the surface, resulting in a "butter finish" appearance). This ratio seems to be promising, also if time is still a critical parameter.
Thanks again,
Giovanni Righini
- Italy
The time is not so critical, but for us one minute was sure enough.
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Anna Berkovich |

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