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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. Pitting and Crevice Corrosion Resistance of Stainless. tion of the resistance of stainless steels and related alloys to bility of regulatory limitations prior to use. pitting and crevice corrosion resistance. Designation: G 48 – 03 (Reapproved ) Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use .

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Astm G48 Pdf

G() Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels Format, Pages, Price. PDF ASTM License Agreement. G48 - Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Format, Pages, Price. PDF ASTM License Agreement. ASTM G() - Designation: G 48 – 03 (Reapproved ) Standard Test Methods for Pitting.

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. Scope responsibility of the user of this standard to establish appro- 1. Referenced Documents exposed to oxidizing chloride environments. A Practices for Detecting Susceptibility to Intergranular 1. Attack in Austenitic Stainless Steels 1. E Practice for Conducting an Interlaboratory Study to 1.

Insulating sleeves shall be used around the bolt and the specimen shall be checked for electrical contact with the bolt. The torque on the bolt in? A torque of 0. The torque must be reported as indicated in NOTE 16—The torque of 0.

NOTE 17— a Titanium bolts, nuts, and? Edge attack ignored. Cover the container with a watch glass, transfer to a constant temperature bath, and allow to come to equilibrium temperature of interest. Crevice corrosion is considered to be present if the local attack is 0.

Testing by ASTM G48 for Pitting and Crevice Corrosion

The starting temperature may be estimated by the following Eq. See Notes 13 and 14 of The standard test period is 24 h. A torque of 1. NOTE 20—The torque of 1. See Notes 13 and Examination and Evaluation A more detailed examination will include the measurement of maximum pit depth, average pit depth, pit density, and crevice depth. See Guide G A test shall be discarded if a rubber band or O-ring breaks at anytime during the exposure period Method B.

NOTE 21—Mass loss corrosion rates of greater than or equal to 0. Visual examination is required. Photographs of a sample with mass loss less than 0. The starting temperature may be estimated for iron base alloys by the following equation 10, 15, 16 : Localized modes of corrosion often result in occluded pits.

Distinguish between pits on specimen edges and faces, recognizing that edge pits may affect pitting on specimen faces. G 48 — 03 unless of speci? It may be necessary to probe some pits to ensure exposure of the cavity. Measure a signi? Do not include the depth of pits that intersect the edges of the specimen in the calculated average.

A clear plastic grid, divided in centimeters, may be helpful, or the surface can be subdivided by scribing with light lines. Measure the greatest depth of attack at the points of contact of the O-rings or rubber bands open notch , and under the TFE-?

Report NOTE 22—It is important to record the means by which the presence of pits or crevices was assessed since, for example, small diameter pits or pits in a region of crevice attack that were not detected by a needle-point micrometer may be observed with a low-magni? The latter test would, therefore, be considered more severe than the former.

Precision and Bias In the discussion below, two types of precision are described: repeatability and reproducibility. Repeatability is within laboratory variability when the same operator uses the same equipment on identical specimens in sequential runs.

Reproducibility refers to the variability that occurs when identical specimens are tested under speci? The results of these tests are given in Table 1. The precision of Methods E and F for measuring the pitting and crevice corrosion resistance was determined in an interlaboratory test program with seven laboratories running triplicate tests on 4 materials. The results of these tests are given in Table 2 An analysis of the data in the table in accordance with Practice E showed that the results were consistent among laboratories and that there were no signi?

Record the maximum pit depth on edges if end grain attack is of interest. NOTE 23—The depth and frequency of attack sites provide a more sensitive criterion than mass loss when assessing resistance to pitting and crevice corrosion Method A and B. For example, little mass would be lost from a specimen that contained only a few small diameter pits that had penetrated the entire specimen cross section.

When attack is signi? The analysis procedure given in Practice E , however, assumes that the temperature results were continuously variable over the interval.

G2MT Laboratories

Hence, this analysis produces results in terms of a continuously variable temperature. G 48 — 03 Keywords This also has the important effect of encouraging the builders of databases to include sufficiently complete information so that comparisons among individual sources may be made with assurance that the similarities or differences, or both, in the test procedures and conditions are covered therein. There are three columns of information in Table X1.

It has no permanent value and does not become part of the database itself. Distinguish between pits on be estimated for iron base alloys by the following equation 10, specimen edges and faces, recognizing that edge pits may 15, G 48 — 03 unless of specific interest; for example, in assessing suscepti- Precision and Bias bility to end-grain attack. In nique; for example, needle point micrometer gage or micro- the discussion below, two types of precision are described: It repeatability and reproducibility.

Repeatability is within labo- may be necessary to probe some pits to ensure exposure of the ratory variability when the same operator uses the same cavity.

G2MT Laboratories

Measure a significant number of pits to determine the equipment on identical specimens in sequential runs. Repro- deepest pit Methods A, C, and E and the average of the ten ducibility refers to the variability that occurs when identical deepest pits Method A. Do not include the depth of pits that specimens are tested under specified conditions at different intersect the edges of the specimen in the calculated average. A clear plastic grid, divided in centime- related alloys using a ferric chloride solution is being deter- ters, may be helpful, or the surface can be subdivided by mined.

Measure the running triplicate tests on four materials. The results of these greatest depth of attack at the points of contact of the O-rings tests are given in Table 1. The precision of Methods E and F for or rubber bands open notch , and under the TFE-fluorocarbon measuring the pitting and crevice corrosion resistance was blocks or multiple crevice assembly.

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The results Report of these tests are given in Table 2 An analysis of the data The C 2 7 latter test would, therefore, be considered more severe than the former.

Record the and F for the materials tested were: Method sR R NOTE 24—The procedure described above recommends that the tem- The analysis procedure given in grams per square centimeter for Methods A and B. Practice E , however, assumes that the temperature results were continuously variable over the interval. Hence, this analysis produces NOTE 23—The depth and frequency of attack sites provide a more results in terms of a continuously variable temperature. However, the sensitive criterion than mass loss when assessing resistance to pitting and results may be better interpreted as indicating the repeatability within crevice corrosion Method A and B.

The penetrated the entire specimen cross section. G 48 — 03 Keywords This also has the important effect of encouraging the be of no value for that specific application.

However, there are builders of databases to include sufficiently complete informa- a certain minimum number of fields considered essential to any tion so that comparisons among individual sources may be database without which the user will not have sufficient made with assurance that the similarities or differences, or information to reasonably interpret the data.

In the recom- both, in the test procedures and conditions are covered therein. There are the recommendation must be included in every database. Rather it is a guide as to those elements that are likely to be X1.

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It is understood dealing with the individual fields within this format guideline. In those cases, databases builders the case of properties or other numeric fields, the units in which are encouraged to include them as well as the elements in the the numbers are expressed.

Category sets are closed that is, recommended format. Guidelines for formats for additional complete sets containing all possible or acceptable inputs to elements are given in Guide G Values are representative sets, listing sample but not necessarily all acceptable inputs to the field. It does not include X1. These items are covered in Guide E and by separate compare sets of data from individual databases and to make the formats developed for reporting other material property data.

They do not imply a necessity to include all of these fields in any specific database nor imply a requirement that the fields be used in this particular order. Nash, and R. Louis, MO, Wensley, C. Reid, D. Brown, and D. Kearns, M. Johnson, and J.

Corrosion, Vol 30, No. RK of Oct.

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

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and if not revised, either reapproved or withdrawn.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm. Related Papers. By Yunan Prawoto.

By martin rodriguez.

By Al T. Pitting corrosion evaluation and inhibition of stainless steels: A review. Method C — Critical pitting temperature test for nickel-base and chromium-bearing alloys. Method D — Critical crevice temperature test for nickel-base and chromium-bearing alloys.

Method E — Critical pitting temperature test for stainless steels. Method F — Critical crevice temperature test for stainless steels. Our lab offers all 6 methods of this test as well as ASTM G, the electrochemical method for similar analysis. In many ways, G is ideal for use instead of methods C-F as it is a more rapid method that can be performed within days instead of weeks.

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