15 years ago
I have a question I am hoping the users of this group can help me
answer. I post to rec.guns as well because there are probably some
common overlaps, but my apology if it seems off-topic.
I would like to chemically polish the inside diameter of a 0.030" ID
stainless steel tube, about 2-3" long. This piece of tubing will be
used to make a length of microwave "waveguide", and so I would like to
have a very smooth, clean surface with a well known initial ID.
Electro-polishing is out of the question. We've tried it with poor
results because of the very small wire diameter and more complicated
mechanics required. I've also tried mechanical polishing with dental
floss and abrasive, and besides being tedious it didn't work so well
Others have suggested in the past that I purchase pre-polished
hypodermic grade tubing to begin with, but it is difficult to obtain
small quantities of steel tubing with a 0.030" ID to begin with. I am
lucky to have what I have.
What I would like to do is find an appropriate solution or
solutions that can be pumped through the tube using a tubing pump. I
need an actual chemical *polish* that will remove surface
irregularities in addition to scale, rust and debris inside the tube.
I know there are some companies that do this, but generally they
don't want small quantities of stuff, and it would be very much more
convenient to do this in-house, as we have a reasonably equipped chem
lab. Furthermore, lots of commerical places use proprietary
chemicals, so it will be impossible to know exactly what they did in
the future if I need to repeat the process.
So, I am hoping someone can suggest some chemistries to chemically
(electrolessly) polish steel that I can try in-house, OR recommend a
shop that will do small jobs with a relatively sane turnaround time.
Thanks in advance for any suggestions.