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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Contact us by Phone or Email to find out how we can help your industry. The most convenient size is often a cylinder 10mm diameter by mm long, but other dimensions are possible to suit particular product forms. It does not say what to do about duplex or super austenitic alloys. Bend test criteria for several standards.

The ASTM G28 test methods Awtm and B are utilized in many industries as quality control tests in order to assess the resistance to intergranular corrosion of various stainless steels and nickel-based alloys, such as Alloy and Alloy Advanced search Show search help.

The Tests Table 1 below shows the various methods for four common standards: This test should be avoided for most CRAs, except in the circumstances described below, in section 4.

Applicability of ASTM G28 Testing – OnePetro

The exception to this is ASTM G28 method A, where rates for the onset of intergranular corrosion are described in reference 1. Someone would have experience in this matter.

The latter is a German test, but it is often called up in European projects. 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. The v28 methods in Table 1 were designed with specific alloys in mind, but the proliferation of new CRAs has ast, that the selection of a suitable test method is difficult.


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For ferric sulphate – depending on the concentration and temp, it depends on suitabiity. The Huey test method C is only for molybdenum-free grades, such as L, as alloys with molybdenum show high rates of attack in this test.

Where no specific test is specified, Table 5 suggests the most appropriate alongside a second choice, if the first is declined. There are other requirements in these standards over details that are not discussed in this document, and these should be followed, such as conducting bend tests. NACE International Keywords weldnickel alloystest methodapplicabilitysensitizationintergranular corrosionG28 Downloads 2 in the last 30 days 17 since Show more detail. aztm

It is the responsibility of the user asfm this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Just remember that these tests were devised for specific groups of alloys and should not be applied to all CRAs!

There are a number of recognised tests when it comes to the intergranular corrosion testing of corrosion resistant alloys CRA. It is common practice to perform intergranular corrosion testing in accordance with ASTM 1 G28 on solid solution nickel alloys, e. gg28

SEP does not require ageing, although it might be required in a specification calling up this standard. Warning statements are given in 5.

Ast G28 lists alloys and specifies the test exposure for each. ISO is specifically for duplex and all austenitic stainless steels, and recommends ageing at two different temperatures:.

ISO is the most rigorous in terms of defining test methods, and says which alloys should use which y28 methods as follows:. Link to Active This link will always route to the current Active version of the standard. About us Contact us Help Terms of use.

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In my case the samples shows damage only at six hours. Proceedings of an international conference Diverless and Deepwater Techology: R Baboian, Corrosion Tests and Standards: Alternatively, a welded test-piece in the as-welded condition may be tested.


For an alloy that is not listed, look for an alloy with a similar composition to a listed alloy to determine h28 most suitable test. The test method is not applicable to cast products.

Problems with corrosion test ASTM G28 – General Corrosion Topics

ASTM A was designed for austenitic stainless steels, specifically the series alloys. The effect of post weld surface treatments on the corrosion resistance of super duplex stainless steel welds in sea water Sensitization or undesirable intergranular precipitation may occur due to deleterious thermal cycles, because of welding or heat treatment, for example.

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. Hello everybody, My query is as follows: However, there are necessarily limitations in the potential applicability of standard tests because the mechanism of corrosion in the service environment may be different than that targeted in the standard test, due to the difference between the actual service environment and the test solution.

Moreover, my samples of incoloyaccording this test, should last for hours without intergranular corrosion. Conducting the Tests 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.

JavaScript is required for this content. It is possible to have grain boundary precipitation without the presence of chromium-depleted zones, and indeed such a microstructure has been shown to be beneficial in avoiding intergranular stress corrosion cracking IGSCC in high temperature water in nuclear industry applications, although clearly this cannot be generalized.