ASTM-G97 › Historical Revision Information
Standard Test Method for Laboratory Evaluation of Magnesium Sacrificial Anode Test Specimens for Underground Applications
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Scope
1.1 This test method covers a laboratory procedure that measures the two fundamental performance properties of magnesium sacrificial anode test specimens operating in a saturated calcium sulfate, saturated magnesium hydroxide environment. The two fundamental properties are electrode (oxidation potential) and ampere hours (Ah) obtained per unit mass of specimen consumed. Magnesium anodes installed underground are usually surrounded by a backfill material that typically consists of 75 % gypsum (CaSO4·2H 2O), 20 % bentonite clay, and 5 % sodium sulfate (Na 2SO4). The calcium sulfate, magnesium hydroxide test electrolyte simulates the long term environment around an anode installed in the gypsum-bentonite-sodium sulfate backfill.
1.2 This test method is intended to be used for quality assurance by anode manufacturers or anode users. However, long term field performance properties may not be identical to property measurements obtained using this laboratory test.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautions, See Section 7 and Paragraph 8.1.1.
Significance and Use
4.1 This test is a guide for evaluating magnesium anodes. The degree of correlation between this test and service performance has not been fully determined.
Keywords
coulometer; electroplater's tape; sacrificial anode; ICS Number Code 77.040.99 (Other methods of testing of metals)
To find similar documents by ASTM Volume:
03.02 (Corrosion of Metals; Wear and Erosion)
To find similar documents by classification:
77.040.99 (Other methods of testing of metals)
77.150.20 (Magnesium products)
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Document Number
ASTM-G97-97(2013)
Revision Level
1997 R13 EDITION
Status
Superseded
Modification Type
Reapproval
Publication Date
July 15, 2013
Document Type
Test Method
Page Count
4 pages
Committee Number
G01.10