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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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Method E — Critical pitting temperature test for stainless steels. Peer reviewed only Published between: We hired an independant 3rd party to perform corrosion testing to G48 Method A as per client requirements but by mistake 3rd party booked the specimen to A and testing was done also to A and result is OK.

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Methods E and F are for stainless steels and have a test time of 24 hours. Six procedures are described and identi? A h air passivation after grinding or pickling is sufficient to minimize these differences 8.

Hence, this analysis produces results in terms of a continuously variable temperature. Photographs of a sample with mass loss less than 0. They do not imply a necessity to include all of these? This is a simple immersion test where zstm test sample is placed in a asrm solution of FeCl 3.

Values are representative sets, listing sample but not necessarily all acceptable inputs to the? C tests at that temperature is clear that the microstructure have been affected.

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Individual reprints single or multiple copies of this standard asfm be obtained by contacting ASTM at the above address or at phonefaxor service astm. Yes, we did not add HCL to the test solution. A reduction from 24 Deg C to 20 Deg C could be astmm. Methods C, D, E and F allow for a ranking of alloys by minimum critical temperature to cause initiation of pitting corrosion and crevice corrosion, respectively, of stainless steels, nickel-base and chromium-bearing alloys in a standard ferric chloride solution.

The analysis procedure given in Practice Ehowever, assumes that the temperature results were continuously variable over the interval. Exposure time shall be 24 hours. This standard contains six methods, A through F. Guidelines for formats for additional elements are given in Guide G Unless end-grain adtm is an integral part of the evaluation, the proportion of end-grain surface to specimen surface should be kept as small as possible given the limitations of specimen sizes because of the susceptibility of end-grain surfaces to pitting.

Testing by ASTM G48 for Pitting and Crevice Corrosion

Each block shall be There asgm several factors that can influence the selection of methods; we can help you with this part of the process as well. All specimens in a test series should have the same dimensions when comparisons are to be made.

Method D — Critical crevice temperature test for nickel-base and chromium-bearing alloys. G 48 — 03 Reproducibility refers to the variability that occurs when identical specimens are tested under speci? Method F — Critical crevice temperature test for stainless steels.

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Condensers are required for elevated temperature testing when solution evaporation may occur. Like what you saw?

The Eng-Tips staff will check this out and take appropriate action. This should indicate if you have any intermetallic phases present. You may polish the edges, if the finished product is pickled then you can pickle, the times and temps are general guidance. The available pitting and crevice testing methods include:.

Or at least do micros. 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.

NOTE 11—The removal of specimens for inspection may affect the rate of corrosion, and caution should be observed when comparing these results with atm obtained from constant immersion awtm.

No further reproductions authorized. Methods D and F use a multiple crevice assembly which has a number of grooves and plateaus and is attached to the test sample with an insulated bolt. Wet polishing is preferred, but if dry polishing is used, it should be done slowly to avoid overheating.

Perhaps not at temp long enough or not cooled quickly enough.

Contact our corrosion experts today! Do not include the depth of pits that intersect the edges of the specimen in the calculated average.