This standard is issued under the fixed designation B ; the 1 This test method is under the jurisdiction of ASTM Committee B05 on Copper. Designation: B – 95AMERICAN SOCIETY FOR TESTING AND West Conshohocken, PA Reprinted from the Annual Book of ASTM Standards. ASTM B pdf – Download as PDF File .pdf), Text File .txt) or read online .
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
This standard has been approved b1154 use by agencies of the Department of Defense. This test method is intended to cover the mercurous nitrate test of certain copper-alloy products supplied in accordance with ASTM speci?
This test method is not intended to be used on assembled parts. NOTE 1—For any particular copper alloy, reference should be made to the material speci?
Upon removal from the solution, the test specimen is washed and immediately examined visually for cracks. This test method is not intended for assemblies under applied stress.
If used for that purpose, the results shall be for information only and not a cause for rejection of the assembly, its component parts, or the original mill product.
Reagents and Materials 6. Unless otherwise indicated, it is intended that all reagents conform to the speci? Used solutions may be replenished as described in 6.
After the crystals are completely dissolved, dilute the solution with 4 Reagent Chemicals, American Chemical Society Speci? The values given in parentheses are for information only.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determines the applicability of regulatory limitations prior to use. Warning—Mercury is a de? Summary of Test Method 4.
ASTM B – 12 Standard Test Method for Mercurous Nitrate Test for Copper Alloys
Current edition approved Oct. Originally published as B — 41 T. Last previous edition B — Warning—The mercurous nitrate crystals are obtainable in both the monohydrate and dihydrate form and should be handled b54 caution because of their highly toxic effects.
Warning—When weighing crystals, the weight of the water of crystallization should be taken into consideration. The mercurous nitrate crystals are photosensitive and when they have turned yellow are difficult to dissolve. Warning— Care should be exercised when handling and mixing chemicals. Carefully dilute with distilled water to mL.
This provides a concentration of g of HgNO3 after a slight loss due to heating. Add the water in small portions while stirring to prevent local overdilution. This gradual dilution, together with the excess acid, will prevent precipitation of basic salts of mercury.
The use of rubber gloves in testing is advisable.
ASTM B154 – 16
Then titrate the solution with 0. Repeat this procedure with 50 mL of a standard 1 weight per volume percent of HgNO3 solution. Values of R and X for a litre volume are given in Table asrm. NOTE 2—If heating is used in either of the previous procedures, the container should be covered with a watch glass to prevent loss of HNO3 and water to the atmosphere. After solution is complete, use a small volume of retained dilution water to rinse the watch glass into the container.
Sampling and Test Specimen Preparation 8. In the event that a test specimen size is not prescribed in a given rod, wire, or tube speci? If necessary, totally immerse the specimen in an aqueous solution of 15 volume percent sulfuric acid H2SO4 or 40 volume percent h154 acid until all oxides are completely removed from its surface or pickle in such solutions as may be prescribed in the speci?
Remove the specimen from the pickling solution and wash it immediately in running water. Drain the specimen free of excess water and, at room temperature, immerse it totally in the mercurous nitrate solution prepared in accordance with 6. Use at least 15 mL of mercurous nitrate ast, per square millimetres of exposed surface of the atsm specimen.
Wipe off any excess mercury from the surface of the specimen. Immediately examine it visually for cracks unless a time limitation is provided in the product speci? They may not be included with returns for remelting or machined into product.
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