Rudy's explanation is an elegant one, just one thing to add:
It is possible depending on the original cause, that once you have
started on the sequence described that it will continue. The formation
of the carbonate releases the original acidic component which will
take more material to a soluble salt which gets more CO2 to make a
carbonate which .... and so on.
This explains the sometimes relatively large amount of these deposits
compared to the initial amount of "starter."

Mike


----- Original Message -----
From: "<Rudy Sedlak>" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 31, 2001 2:51 PM
Subject: Re: [TN] Lead carbonate growth during humdity testing


> Lead Carbonate formation is almost certainly a two step process.
>
> The first step is probably formation of Lead oxide, or other Lead
salt,
> probably done at high temperature, and/or aided by some chemical
that is more
> aggressive than Carbonate, like Chloride.
>
> The second step is the reaction of this Lead salt, with either your
> Armaclean, or atmospheric Carbon Dioxide, to give you Lead
Carbonate.
>
> Not sure how much this helps, but this is an analysis knowing the
chemical
> properties.
>
> Rudy Sedlak
> RD Chemical Company
>

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