lead corrosion revisited

[Prof. Euphonious Thump]

Could be impurities in the lead which actegorize it,
sort of, as "pot metal' ???
Thumpe

--- Willem Blees <wimblees at aol.com> wrote:

> 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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