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ASTM G48 testing in ferric chloride solution allows a quick assessment of pitting corrosion resistance of stainless steels. Although service is rarely in media similar to this very aggressive test solution, there are similarities between ferric chloride solution and the environment within a corrosion pit that may develop during service in chloride solutions, eg seawater.
Hence, this test has become accepted as a quality control or ranking test for stainless alloys and welds. There has been much debate about the most appropriate test temperatures, so if a weld fails the test criterion, it is worth checking that the test temperature was correctly specified. Test temperatures significantly above these would cause corrosion of many welds that have perfectly acceptable service properties. The most effective ways of improving pitting performance and hence increasing the likelihood of passing the test include the following:.
For further information, please contact us. ASTM GC - 'Standard test methods for pitting and crevice corrosion resistance of stainless steels and related alloys by use of ferric chloride solution'.
Support for SMEs. Software Products. Go to Technical knowledge Search. Login Login. Members' Portal. What can I do about it and what is its relevance anyway? Frequently Asked Questions ASTM G48 testing in ferric chloride solution allows a quick assessment of pitting corrosion resistance of stainless steels.
The most effective ways of improving pitting performance and hence increasing the likelihood of passing the test include the following: Improve the weld surface finish by removing weld oxides. This may be done by pickling, grinding, brushing or blasting after welding or, for gas shielded welding, by improving the effectiveness of the gas shielding on the root or cap side, as appropriate.
Note that pickling may change the required test temperature. Metallurgical examination may reveal the presence of too much ferrite or 'sigma' phase. Both of these may act to lower corrosion resistance but the former is infrequently encountered and the latter is largely restricted to superduplex grades. If sigma phase is present, the weld heat input or interpass temperature may be too high.
Ferrite formation is encouraged by low heat input fast cooling rate and inadequate addition of filler metal. For more information please email: contactus twi.
Historical Version s - view previous versions of standard. More G The results may be used for ranking alloys in order of increasing resistance to pitting and crevice corrosion initiation under the specific conditions of these methods. Methods A and B are designed to cause the breakdown of Type at room temperature. No statement can be made about resistance of alloys in environments that do not contain chlorides. Consequently, the degree of corrosion damage that occurs during testing will generally be greater than that in natural environments in any similar time period. 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.
St ASTM G48-11(2015)
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