Electronic components are typically stored in nitrogen for long term storage and lead finish preservation.
Terry On Tuesday, July 12, 2016 at 10:00:14 PM UTC-5, Jeff Walton wrote: > > > > > > Dalibor, > > > > As an expert on the materials used in the manufacture of nixie tubes, > would you recommend any method of cleaning or neutralizing the corrosion of > the pins and seals? Is there any chemical that could neutralize the > chemical reaction of the pins which would slow down the process? > > > > Sometimes parts are shipped in bags with materials that protect the > finish. In my early days with Texas instruments, IC’s were all shipped > with a silver plating on pins which would tarnish badly if the shipping > bags were unsealed and they often shipped them in containers with a > chemical that was more chemically active in air to remove sulfides and etc > to prevent tarnishing. They also used coated shipping rails that were > static resistant with corrosion inhibitors. Might there be something that > could be placed inside a clock housing which would sacrifice itself to > prevent oxidation/corrosion of the tube pins? > > > > > > *From:* [email protected] <javascript:> [mailto: > [email protected] <javascript:>] *On Behalf Of *Dalibor > *Sent:* Tuesday, July 12, 2016 3:32 AM > *To:* neonixie-l > *Subject:* [neonixie-l] Re: IN-18 Typical Failure Mechanism > > > > > > I guess it is a leak along one of the pins, dumet seals can corrode (it is > a copper plated nickel-iron wire). I would be interested to do a leak test > on a helium leak detector. Of course if you can miss the tube. > > > > Just a very small (tiny tiny!) amount of air is enough to ruin the balance > of the gas inside a nixie tube. Less than one would actually think. > > > > Dalibor > > > > > > Dne pátek 8. července 2016 20:48:04 UTC+2 Jeff Walton napsal(a): > > > > I recently had a IN-18 failure in a clock after about 2.5 year operation. > Over a (4) day period, the digits in one of the tubes stopped working in > PWM dimmed mode. At full brightness, the digits in the affected tube > slowly lost percentages of digit coverage to where only portions of each > digit would illuminate. At the end of the observed period, the digits in > the failing tube went completely dark and even higher voltage on the bench > would not illuminate any of the cathodes. The tube date code was 8505. > > > > I am guessing that absent of any other signs of damage, a seal around one > of the pins has failed and allowed the tube to leak. It was surprising how > quickly it failed and none of the other tubes in the same clock have > exhibited any signs of trouble and look as good as the first day of > operation. Has anyone experienced similar failures with the IN-18? Is > this a typical failure mechanism? Have there been any particular date > codes that others have found to be problematic? > > > > The tube has been since been replaced and the clock is happy again but > curiosity leads me to ask about this experience to the rest of the members > of the group. FYI - these tubes have not been rotated since the clock was > initially put into operation (no handling). There was never any evidence > of cathode poisoning during the operation of the clock. > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] <javascript:>. > To post to this group, send email to [email protected] > <javascript:>. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/0ec52c6e-eefb-43f8-8e61-349fa55a8e54%40googlegroups.com > > <https://groups.google.com/d/msgid/neonixie-l/0ec52c6e-eefb-43f8-8e61-349fa55a8e54%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/9ae7d6f8-55e9-49f7-a5c1-d8aa4d301362%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
