Sulphamic acid

Neil Mahrer <neil.mahrer [at] jerseyheritagetrust__org> writes

>...  He is also keen to give us a large amount of
>sulphamic acid which he has used for some years in the
>cleaning/stripping of recovered copper and brass items. ...
>on its possible use before I respond to his offer.

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I work in the field of concrete repair (epoxy related). Sulfamic
acid is weaker than Muriatic acid it can be found in a lot of
household cleaning solutions like toilet bowl cleaner and "tarnish"
removers.

Acid etching and cleaning can do a lot of work but can also "make" a
lot of work, or cause a lot of damage, sometimes sooner and
sometimes later. Using a corrosion inhibitor with the acid will
protect the sound metal substrate while going after the oxidized
metal.

For dilution ratios look on the Internet: "Sulfamic Acid, Tarnish";
solutions start at as little a 3 percent.

You can get an idea as to the benefits of a synergistic corrosion
inhibitor at the address below.

    <URL:http://www.surfactantseurope.akzonobel.com/
        bulletins/Armohib.pdf>

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Brian Soper
Alchemer Solutions
Product Manager
San Jose, CA.


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                  Conservation DistList Instance 20:22
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