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underlying chemistry of the mercurous nitrate stress test

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denis rowe | 21:02 Thu 03rd Feb 2005 | Science
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I have been testing brass samples for residual stress.Very briefly, the sample is degreased with acetone,then 'pickled' in 40% nitric acid,immersed in dilute mercurous nitrate solution for 15 minutes and examined for cracks under 15X magnification. Can anybody please explain the theory/ reactions behind this procedure ? (the more detail the better and any good references.)
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Avatar Image ann_h

As brass is a copper/zinc alloy, and both of these react variously with/in the presence of other substances such as mercury, it is important to know what the reactions and damage are for use in armoury, industrial fittings etc.

Try these two for a start.

www.corrosion-doctors.org

www.fpsmith.com

13:18 Fri 11th Mar 2005

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