ASTM G_Laboratory Immersion Corrosion Testing of Metals – Free download as PDF File .pdf), Text File .txt) or read online for free. ASTM G Other ASTM procedures for laboratory corrosion tests are tabulated in the Appendix. NOTE 1—Warning: In many cases the corrosion product on the reac-. ASTM G Standard Practice for Laboratory Immersion Corrosion Testing of Metals_能源/化工_工程科技_专业资料. 暂无评价|0人阅读|0次.

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These factors include oxygen concentration, temperature, rate of? In many such cases, corrosion rates are established by mass gain rather than mass loss. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

This cannot be evaluated by mass loss alone. The degree of lateral spreading of pits may also be g331. In special asym for example, for aluminum and certain copper alloysa minimum of 24 h storage in a desiccator is recommended.

For solutions corrosive to glass, suitable metallic or plastic kettles may be employed. It may be desirable to test a surface representative of the material and metallurgical conditions used in practice. The values given in parentheses are for information only.

ASTM G31 – 72() Standard Practice for Laboratory Immersion Corrosion Testing of Metals

Any necessary distortion of the test conditions must be considered when interpreting the results. Atsm required, the exhausted constituents should be added or a fresh solution provided during the course of the test.

If agitation is required, the apparatus can be modi? However, the calculations must not be based on mass loss except in quali? Therefore, short tests on such materials would indicate a high corrosion rate and be completely misleading. It is impractical to propose an inflexible standard laboratory corrosion testing procedure for general use, except for material qualification tests where standardization is required.

A large surface-to-mass ratio and a small ratio of edge area to total area are desirable. Proper ultrasonic procedures are an acceptable alternate.

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Immersion Corrosion Testing According to ASTM G31 Standard

Warning—In many cases the corrosion product on the reactive metals titanium and zirconium is a hard and tightly bonded oxide that de? The choice of a speci? If cleaning deposits for example, scouring powder remain or lack of complete dryness is suspected, then recleaning and drying is performed until a constant mass is attained.

A liquid atmospheric seal is required on the test asmt to prevent further contamination. The actual time of contact of the metal with astmm solution must also be taken into account.

Careful observation is needed to ensure that pitting does not occur during cleaning.

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Aetm reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Link to Active This link will always route to the current Active version of the standard. Occasional exceptions, in which a large difference is observed, can occur under conditions of borderline passivity of metals or alloys that depend on a passive?

It is the responsibility of the user of this standard g3 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. If clad alloy specimens are to t31 used, special attention must be given to ensure that excessive metal is not removed. The use of towels for drying may introduce an error through contamination of the specimens with grease or lint.

Scrubbing with a bristle brush and mild abrasive is the most popular of these methods. This practice, rather than a standardized procedure, is presented as a guide so that some of the pitfalls of such testing may be avoided.

Location of deposits, variations in types of deposits, or variations in corrosion products are extremely important in evaluating localized corrosion, such as pitting and concentration cell attack. This standard, rather than a standardized procedure, is presented as a guide so that some of the pitfalls of such testing may be avoided. Too much surface preparation may remove segregated elements, surface contamination, and so forth, and therefore not be representative.

Localized corrosion is reported separately. The density in the constant K cancels out the density in the corrosion rate equation. The amount of possible contamination can be estimated from the loss in mass of the specimen, with proper application of the expected relationships among 1 the area of corroding surface, 2 the mass of the chemical product handled, and 3 the duration of contact of a unit of mass of the chemical product with the corroding surface.

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Molarity and normality are also helpful in de? This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. The mechanical property commonly used for comparison is the tensile strength.

Therefore, at least duplicate specimens should normally be exposed in each test. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The values given in parentheses are for information only. Active view current version of standard. The suggested apparatus is basic and the apparatus is limited only by the judgment and ingenuity of the investigator.

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.

Most tests related to process equipment should be run with the natural atmosphere inherent in the process, such as the vapors of the boiling liquid.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory asgm prior to use. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

This can be done by chemical treatment picklingelectrolytic removal, or by grinding with a coarse abrasive paper or cloth such as No.