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September 1997

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TechNet Mail Forum<[log in to unmask]>
Subject:
From:
Paul Gould <[log in to unmask]>
Date:
Fri, 12 Sep 1997 14:00:05 +0100
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1.0
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"TechNet Mail Forum." <[log in to unmask]>, Paul Gould <[log in to unmask]>
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Hello all,

We use plastic coated stainless steel plating jigs for copper and tin-
lead plating. When they start to plate over the plastic coating, we
strip in a 50% nitric acid solution unheated. After a while the racks
become coated with a white precipitate of tin and lead salts which are
seemingly impossible to remove.

Q1
Can anyone advise how to prevent this precipitate forming eg does a
proprietary stripper eliminate this.

Q2
Is there a chemical method of removing it without exceeding 122F (50C).

Thanks for any assistance.
--
Paul Gould
[log in to unmask]
Isle of Wight,UK

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