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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Testing by ASTM G48 for Pitting and Crevice Corrosion

The crevice former contact area of Method B is a Each block shall be Could any one explain the potential reasons for the failure and moreover what countermeasures shall be considered to avoid repeated failure? Method D — Critical crevice temperature test for nickel-base and chromium-bearing alloys.

Methods C, D, E and F allow for a ranking 4g8 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.

If so affected, they should be discarded. The starting temperature may be estimated by the following Eq. Ed, The issue is not confused.

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They use similar test solutions but they are done for very different reasons. Ultrasonic cleaning may be used as a substitute method in cases in which it is difficult to remove corrosion products from deep pits. G 48 — 03 C tests at that temperature is clear that the microstructure have been affected.


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. A h air passivation after grinding or pickling is sufficient to minimize these differences 8. 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.

The crevice design shown in Fig. Methods E and F are for stainless steels and have a test time of 24 hours. Last previous edition approved in as G 48— Unless end-grain pitting is an integral part of the evaluation, the proportion of end-grain surface to specimen surface should be kept as small as possible given sstm limitations of specimen sizes because of the susceptibility of end-grain surfaces to pitting. About us Contact zstm Help Terms of use.

Distinguish between pits on specimen edges and faces, recognizing that edge pits may affect pitting on specimen faces.

The torque on the bolt in? If testing requires use of a condenser described belowthe test tube 5. Overmatched filler etc and you have good micros and impacts then the test qstm probably just too severe.


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

Reproducibility refers to the variability that occurs when identical specimens are tested under speci? A summary of the methods is listed in Table 1 below.

The Eng-Tips staff will check this out and take appropriate action. No more than one specimen shall be placed in a test container. It has no permanent value and does not become part of the database itself. These include the cold? Don’t play mix and match with test conditions and procedures. NOTE 2—The use of ground joint condensers requires that the mouth of the?

asstm Current edition approved May 1, The available pitting and crevice testing methods include:. However, the G48 test is meant for ranking or qualification, and not as designed for determining a corrosion rate over time.

A and B are for qualification of alloys to pitting and crevice corrosion at specific temperatures, C and D are for determining atm critical pitting and crevice corrosion temperatures of chromium and nickel alloys, and E and F are for stainless alloys.

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

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