ABSTRACT It is common practice to perform intergranular corrosion testing in accordance with ASTM (1) G28 on solid solution nickel alloys, e.g. UNS N . Alloy 22 is a Ni-Cr-Mo alloy (Nickel-Chromium-Molybdenum) and is one of the most versatile corrosion resistant alloys used in industry today. Intergranular Attack Susceptibility For Nickel Alloys.

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For alloys not listed in this standard, it will be necessary to carry out some tests on material in various conditions to determine the threshold.

ISO is y28 most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows: Materials shown to be susceptible may or may not be intergranularly corroded in other environments.

asm Hence, it is normally only used for stainless steels intended for nuclear service, or another application involving nitric acid.

It can be seen that some alloys fall into two categories, and no guidelines are given for selecting the most appropriate. Peer reviewed only Published between: Alternatively, a welded test-piece in the as-welded condition may be tested.

Incoloy will fail and not suitable for dilute sulfuric acid. ASTM G28 lists alloys and specifies the test exposure for each. The test methods in Table 1 asfm designed with specific alloys in mind, but the proliferation of new CRAs has meant that the selection of a suitable test method is difficult. For ferric sulphate – depending on the concentration and temp, it depends on suitabiity.

Moreover, my samples of incoloyaccording this test, should last for hours without intergranular corrosion. Discussion Forums – The Hendrix Group. The specifications for bend testing are shown in Table 4.

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Proceedings of an International Conference Submersible Technology: 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 problem is that the sample was destroyed just six hours, including the test that is annealed solution. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:. Where a standard is included in a purchase specification, this must be followed, although it is advised that unsuitable tests, such as the Huey test for duplex and super austenitic stainless steels, are queried.

It is common practice to perform intergranular corrosion testing in accordance with Asfm 1 G28 on solid solution nickel alloys, e. Hello everybody, My query is as follows: When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as “anonymous”. The uniform corrosion rate obtained by this test method, which is a function of minor variations in alloy composition, may easily mask the intergranular corrosion components of the overall corrosion rate on alloys N, N, N, and N Stay Current Sign up for our quarterly newsletter covering updates on corrosion.

Intergranular Corrosion Tests for CRAs

Samples may be rectangular or cylindrical to suit the test vessel, but where a bend test is required, it is suggested that the sample be a minimum of mm long. Get in Touch Contact us by Phone or Email to find out how we can help your industry.

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Proceedings of an international conference Oceanology: Link to Active This link will always route to the current Active version of the standard. From your description, it could be dilute sulfuric acid for which Incoloy is not suitable Hope this helps C.

ASTM G28 was designed for nickel-based alloys, and a list of applicable alloys for methods A and B is in the standard. Log in to your subscription Username. This document describes all three of these tests for four common standards, and describes the differences. Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined.


Historical Version s – view previous versions of standard. The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. R Baboian, Corrosion Tests and Standards: The results of such tests are applied widely as acceptance tests for parent and welded materials, and as such are essentially used to confirm the suitability of these materials for service.

So please participate and share knowledge just as you have in the past.

SEP also gives guidance on which of its methods apply to which alloys: ISO is the most rigorous in terms of defining test methods, and says which alloys should use which test methods as follows:.

Contact us by Phone or Email to find out how we can help your industry. None of these are identical and cross substitution of results is not possible. Why were these tests designed? SEP method 3 is a special environment only suitable for the Ni-Mo alloys, as described below, in section 4.

I am working with incoloy and am trying to make some corrosion tests according to ASTM G28, which uses a solution of ferric sulphate with sulfuric acid.

Applicability of ASTM G28 Testing – OnePetro

Methods B and E are suggested for all grades of series austenitic alloys, while method F is suggested for cast type alloys. This must be established independently by specific tests 2g8 by service experience. When a test has been selected, follow the detailed directions in that standard for making up the test solution, the preparation of test samples and the finish to be used.