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Example of pitting after corrosion testing in accordance with ASTM G48 Method A . The test temperature of 22 °C is too aggressive for lean duplex grades such. Abstract ASTM G48 – “Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride. 1 These test methods are under the jurisdiction of ASTM Committee G01 on. Corrosion Results for ASTM G48 Standard Test Method for Pitting and Crevice.

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Localized modes of corrosion often result in occluded pits. It does not include the recommended material descriptors or the presentation of other speci?

Condensers are required for elevated temperature testing when solution evaporation may occur. There are three columns of information in Table X1.

Peer reviewed only Published between: You should ignore any edge corrosion If samples fail then they were not annealed correctly. A h air passivation after grinding or pickling is sufficient to minimize these differences 8. A number in parentheses indicates the year of last reapproval.

Testing by ASTM G48 for Pitting and Crevice Corrosion

The ast, of the? Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden. This should indicate if you have any intermetallic phases present. No more than one specimen shall be placed in a test container. Values are representative sets, listing sample but not necessarily all acceptable inputs to the?

The available pitting and crevice testing methods include:. Don’t play mix and match with test conditions and procedures. When testing as-welded, cylindrical, or other non-flat samples, the standard crevice formers will 4g8 provide uniform contact.


Promoting, selling, recruiting, coursework and thesis posting is forbidden. However all tests have to be documented, results to be assessed by client and fabricators, with the Maximum Engineering Integrity of the components being the prime criteria. Record the maximum pit depth on edges if end grain attack is of interest.

Are you sure that the temp is correct for the alloy? The results may be used for ranking alloys in order of increasing resistance to pitting and crevice corrosion initiation under the specific conditions of these methods. A clear plastic grid, divided in centimeters, may be helpful, or the surface can be subdivided by scribing with light lines. Click Here to join Eng-Tips and talk with other members!

Pradip, and All Don’t confuse G48 and A Category sets are closed that is, complete sets containing all possible or acceptable inputs to the?

Tall form or Erlenmeyer? The sides only may be ground to a grit finish and the edges may be rounded. Is the pipe pickled? NOTE 10—While a polished surface is preferred for uniformity, the test may be varied at the discretion of the investigator to evaluate other surface? 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.

They do not imply a necessity to include all of these? Like what you saw? Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.


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Measure the astn depth of attack at the points of contact of the O-rings or rubber bands open notchand under the TFE-? The standard test period is 24 h. Use plastic gloves to avoid hand contact with metal surfaces during this operation. Current edition approved May 1, Rock Mechanics Symposium and 5th U. If you’re forced to pursue asstm wrost case scenario, then the other option is to use super duplex welding consumables for the weld coupon. Repeatability is within laboratory variability when the same operator uses the same equipment on identical specimens in sequential runs.

All surfaces shall be exposed. Photographs of a sample with mass loss less than 0. Methods E and F are for stainless steels and have a test time of 24 hours.

Rubber bands shall be one No. G 48 — 03 unless of speci? The bolt length shall be sized to allow passage through the mouth of the glassware described in 5. Method E — Critical pitting temperature test for stainless steels. Therefore, grinding and pickling of the specimen will mean that the results may not be representative of the conditions of the actual piece from which the sample was taken.