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Chemical Reaction



 
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PNut
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Joined: 08 Apr 2021
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PostPosted: Sat May 08, 2021 6:25 am    Post subject: Chemical Reaction Reply with quote

1955 Olds Ambassador Trumpet:

I thoroughly clean the slider valves and receivers with soap and warm water, until there is no dirt left over.

I've done this twice. Every time I apply Yamaha Synthetic slide grease, work it in, and check movement, all is well.

Overnight a chemical reaction is occurring that causes the grease to turn black.

Is this a common problem?

I'm testing a portion with my Premium Saxophone Cork grease on one of the bottom valve cap threads to see if that causes the same reaction. I'll find out tomorrow morning.
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Rwwilson
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PostPosted: Sat May 08, 2021 8:15 am    Post subject: Reply with quote

This is definitely not normal. After cleaning are the insides and outsides of the tubes brass colored? If so, it appears you are getting some oxidative corrosion of the brass over night. I suspect that the soap that you are using is not all being rinsed away and that it is the cause.
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etc-etc
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PostPosted: Sat May 08, 2021 8:41 am    Post subject: Reply with quote

Something similar happens with Alisyn slide and key oil - the oil remaining within the horn turns yellow with time. This may be due to alkene oxidation catalyzed by brass.
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lipshurt
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PostPosted: Sat May 08, 2021 8:59 am    Post subject: Reply with quote

If I use monster oil, it turns dark yellow right away, and it gets thicker. No other I’ll does that that I have tried. I thought at first that it was some kind of so, ent that was dissoving dark deposits in the casings, but it never stopped turning yellow.
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yourbrass
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PostPosted: Sat May 08, 2021 9:15 am    Post subject: Reply with quote

For slides that don't have to move quickly (tuning, 2nd, 3rd water slide) I use anhydrous lanolin. You can cut it thinner with any valve oil you like. I believe that Schilke slide grease is lanolin. It has a yellow color, but goes on clear, thinly.
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OldSchoolEuph
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PostPosted: Sat May 08, 2021 5:07 pm    Post subject: Reply with quote

That is not at all common.

It sounds like the brass is being oxidized, which is damage happening in real time. Has this horn been recently ultrasonically cleaned? (I am suspecting a residual caustic, or something that becomes more caustic in the presence of the lubricants.)
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PNut
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PostPosted: Tue May 11, 2021 11:53 am    Post subject: Reply with quote

I figured it out. There was some residual buffing compound that I didn't clean off properly. Dawn dish soap, and whamo, problem solved!
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blbaumgarn
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PostPosted: Tue May 11, 2021 7:54 pm    Post subject: Chemical reaction Reply with quote

Good for you PNut, really.
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