ASTM G48 PDF

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 specimen size is 1″ X 2″ cut at gegree and prepared only using grit abrasive paper and was not passivated or pickled. It is good practice to remove deformed edges to the thickness of the material. Pitting corrosion is considered to be present if the local attack is 0.

The torque applied to the bolting assembly is 0. The three crevice tests, Methods B, D and F, vary in crevice-former contact area and crevice gap thickness.

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. Methods A and B are designed to cause the breakdown of Type at room temperature.

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It has no permanent value and does not become part of the database itself. Precision and Bias Cradles, such as those shown in Fig. If someone has a specific procedure that they want reproduced then that is the way it is to be done.

Are you an Engineering professional? Peer reviewed only Published between: Method B — Ferric chloride crevice test.

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Overmatched filler etc and you have good micros and impacts then the test is probably just too severe. NOTE 13—Critical pitting or crevice testing is likely to require three to?

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. G48 is looking to determine the resistance to the initiation of chloride pitting.

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First of all, if you were using scidified ferric chloride it was method C. NOTE 2—The use of ground joint condensers requires that the mouth of the?

Rock Mechanics Symposium and 5th U. The latter test would, therefore, be considered more severe than the former. This test astn was evaluated by interlaboratory testing, Please share this page: The test period must be reported as indicated in Are you sure that the temp is correct for the alloy?

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Method F — Critical crevice temperature test for stainless steels. About us Contact asmt Help Terms of use. NOTE 1—Grinding or pickling on stainless steel surfaces may destroy the passive layer. Could any one explain the potential reasons for the failure and moreover what countermeasures shall be considered to avoid repeated failure?

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

Where you cut a sample and grind the surfaces, no pickle or passivation allowed, and test in ferric chloride? Record the maximum pit depth on edges if end grain attack is of interest.

Or at least do micros. This test method does not determine the critical pitting temperature or test for the suitability for use in a particular environment. Localized modes of corrosion often result in occluded pits.