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UDC 669.3 :620.17 Ref. No.: ISO/R 196-1961 (E)
IS0
O RG A N I Z AT1 O N FOR S TA N DARD IZAT I O N
I N T ERN AT I O N A L
IS0 RECOMMEN DATION
R 196
METHOD OF MERCUROUS NITRATE TEST
FOR COPPER AND COPPER ALLOYS
1st ED IT1 ON
May 1961
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 196, Method of Mercurous Nitrate Test for Copper and
Copper Alloys, was drawn up by Technical Committee ISO/TC 26, Copper and Copper
Alloys, the Secretariat of which was held by the American Standards Association, Inc.
(ASA) until June 1960 and, since this date, by the Deutscher Normenausschuss (DNA).
In preparation for the first meeting of ISO/TC 26, held in Stockholm, in June 1955,
the Secretariat presented a draft proposal concerning the subject of this IS0 Recommen-
dation. This document was examined during the meeting and then turned over to a
Working Group for thorough study; the latter proposed a number of changes. The document
U
was revised accordingly, and was approved by the Technical Committee, in plenary session,
as a Draft IS0 proposal. In November 1957, this draft proposal was circulated for vote
by letter ballot to the members of the Technical Committee.
During its second meeting, held in Harrogate, in June 1958, the Technical Committee
examined the results of the vote and the comments received, and prepared a revised draft
proposal taking into account the amendments presented by various Member Bodies.
On this basis, after full discussion, the draft proposal revised in this way was approved
as a Draft IS0 Recommendation.
On 26 June 1959, the Draft IS0 Recommendation (No. 311) was distributed to all
the IS0 Member Bodies and was approved by the following Member Bodies:
Australia Ireland Poland
Belgium Israel Romania
Burma Italy Spain
Canada Japan Sweden
Chile Mexico Switzerland
Finland Netherlands Turkey
Germany New Zealand United Kingdom
Norway
Greece U.S.A.
India Portugal Yugoslavia
One Member Body opposed the approval of the Draft: France
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in May 1961, to accept it as an IS0 RECOMMENDATION.
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iSO/ R 196-1961 (E)
IS0 Recommendation R 196 May 1961
METHOD OF MERCUROUS NITRATE TEST
FOR COPPER AND COPPER ALLOYS
1. SCOPE
This IS0 Recommendation describes the technique for conducting the mercurous nitrate test of
wrought copper and copper alloy products. It is an accelerated test for the purpose of detecting
the presence of residual (internal) stresses that might bring about failure of the material in service
or storage through stress corrosion cracking.
While this method has also been used for testing assemblies and partial assemblies, the method
is not intended for that purpose, and some modification may be required for such use.
2. MERCUROUS NITRATE SOLUTION
2.1 Concentration. The solution is an aqueous mercurous nitrate solution containing 10 g of
HgNO, and 10 ml of HNO, (density 1.40 to 1.42 g/cm3) per litre of solution.
2.2 This aqueous mercurous nitrate solution is to be prepared by either of the foliowing
procedures A or B.
2.2.1 Procedure A. Dissolve 11.4 g of HgNO,, 2H,O or 10.7 g of HgNO,, H,O in approxi-
mately 40 ml of distilled water, acidified with 10 ml of "O,. After the crystals are
completely dissolved, dilute the solution with
...