lead corrosion revisited

[Leslie Bartlett]

I just filed the corrosion off a set of Sohmer keys, and then sprayed
lacquer on them.......  No idea if it will work. I filed past the
corrosion.....
les bartlett

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Willem Blees
Sent: Wednesday, March 19, 2008 11:35 PM
To: Pianotech at ptg.org
Subject: lead corrosion revisited


At our meeting last night, one of the members brought up something very
interesting. He did some research and found information from "Lead Corrosion
in Exhibition Ship Models- Carderock Division of NAVSEA Warfare Center.
(www.dt.navy.mil/cnsm/lead_01.html.)
 
In a nutshell, it is not necessarily high humidity that causes lead to
corrode. It seems that wood and glue causes lead to corrode. All woods
contain acetic acid, which causes lead to corrode. It is also the chemicals
found in glues and even the punchings. 

But what is interesting is, why are some leads susceptible to corrosion, and
not others? The consensus amongst the other three techs here, is that 25
year or older Sohmer and Kimball pianos are the worst. At least here in
Hawaii. What is it in the make up of the lead in those pianos that causes
them to corrode? I have found a few pianos back in St. Louis with this
problem, but not as many as here. (I've done 10 sets of keys out of about
225 pianos, just since I got here) Although other pianos have that problem,
it is very seldom. It happens only occasionally in Asian made pianos, but
then there aren't that many that are more than 30 years old. 

Just thought I'd share that information with you guys.  


Willem (Wim) Blees, RPT
Piano Tuner/Technician
Honolulu, HI
Author of 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com
  _____  

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