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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The torque on the bolt in?

Reproducibility refers to the variability that occurs when identical specimens are tested under speci? The test period must be reported as indicated in The FeCl 3 solution provides an aggressive environment to promote localized corrosion due to the presence of chloride ions, oxidizing conditions, and low pH.

Are sstm working with a cast duplex product?

Testing by ASTM G48 for Pitting and Crevice Corrosion

Transfer the test beaker to a constant temperature bath and allow the test solution to come to the equilibrium temperature of interest. Insulating sleeves shall be used around the bolt and the specimen shall be checked for electrical contact with the bolt.

Which one do you need? ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. Filter through glass wool or?

I don’t know any end users who test for 72 hours. Contact our corrosion experts today!

These include the cold? If you’re forced to pursue the wrost case scenario, then the other option is to use super duplex welding consumables for the weld coupon. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This test method is designed solely for detection of the precipitation of detrimental intermetallic phases in duplex stainless steels. Values are representative sets, listing sample but not necessarily all acceptable inputs to the?


A summary of the methods is listed in Table 1 below. 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. Glass cradles or hooks also may be required. In some cases, the crevice formers may become stained with corrosion products from the tested alloy.

Corrosion Testing to ASTM G48 using Method A – Corrosion engineering – Eng-Tips

If further exposure is required, the specimen and solution should be returned to the test tube before the specimen drys and the test tube should be immediately returned to the bath. A h air passivation after grinding or pickling is sufficient to minimize these differences 8.

Category sets are closed that is, complete sets containing all possible or acceptable inputs to the? Samples shall not be pickled or passivated prior to test.

Publishers Content Coverage Privacy. All specimens in a test series should have the same dimensions when comparisons are to be made. NOTE 1—Grinding or pickling on stainless steel surfaces may destroy the passive layer. Wet polishing is preferred, but if dry polishing is used, it should be done slowly to avoid overheating. Please share this page: This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment.

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The analysis procedure given in Practice Ehowever, assumes that the temperature results were continuously variable over the interval. Link to Active This link will always route to the current Active version of the standard.

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Each assembly comprises a threaded bolt and nut plus two washers. Methods C and D are for Ni-based, Cr-bearing alloys and define the test time at 72 hours. Otherwise, for wrought it normally would revert to A for testing. You may polish the edges, if the finished product is pickled then you can pickle, the times and temps are general guidance.

A h air passivation after grinding or pickling is sufficient to minimize these differences 8. The available pitting and crevice testing methods include: G48 Method A is commonly called out for cast superduplex stainless with a 24 hour test period at 50C and 24hrs.

G 48 — 03 FIG. G8 edition approved May 1, However, there are a certain minimum number of?

No more than one specimen shall be placed in a test container. Exposure time shall be 24 hours. Tall form or Erlenmeyer? The three crevice tests, Methods B, D and F, vary in crevice-former contact area and crevice gap thickness. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.