ASTM G48-11 PDF

You are on page 1of 11 Search inside document Designation: G48 11 Reapproved Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use of Ferric Chloride Solution1 This standard is issued under the fixed designation G48; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. Scope responsibility of the user of this standard to establish appro- 1.

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

The use of contoured crevice formers may be considered in such situations, but the use of a pitting test Practices A, C, or E should be considered. Scope 1. Methods C, D, E and F allow for a ranking of 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.

Other units are given in parentheses for information only. 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.

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