ASTM G_Laboratory Immersion Corrosion Testing of Metals. August 18, | Author: Description. Designation: G 31 – 72 (Reapproved ). Buy ASTM G() Standard Practice for Laboratory Immersion Corrosion Testing of Metals from SAI Global. Offering ASTM G31 corrosion testing + modified tests to fit your needs and budget . Rapid, high-quality service by experts.
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Methods for chemical cleaning after testing of specific metals and alloys are described in Practice G 1. These changes should be determined if possible.
Masking may also be used to achieve the desired area ratios but may cause crevice corrosion problems. Alternatively, the coupon may be rotated through the environment, although it is then difficult to evaluate the velocity quantitatively because of the stirring effects incurred.
Too much surface preparation may remove segregated elements, surface contamination, and so forth, and therefore not be representative. However, the calculations must not be based on mass loss except in qualification tests such as Practices Awhich is usually small but on microsections which show depth of attack.
This can be accomplished by analysis of the solution after corrosion has occurred. Link astn Active This link will always route to the current Active version of the standard. The values given in parentheses are for information only. This can be done by chemical treatment picklingelectrolytic removal, or by grinding with a coarse abrasive paper or cloth such as Asstm. Proper ultrasonic procedures are an acceptable alternate. Circular specimens should preferably be cut from sheet and not bar stock, to minimize the exposed end grain.
However, there are cases where this assumption is not valid. These ratios can be achieved through the use of square or circular specimens of minimum thickness.
ASTM G_Laboratory Immersion Corrosion Testing of Metals – Free Download PDF
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. Thank you for interesting in our services. The values given in parentheses are for information only. It is imperative to note that this usually occurs with no significant loss in mass of the test coupon, although certain refractory metals are an exception to these observations.
For proper interpretation of the results obtained, the specific influence of certain variables must be considered.
Close attention and a more sophisticated evaluation than a simple mass loss measurement are required to detect this phenomenon. The suggested apparatus is basic and the apparatus is limited only by the judgment and ingenuity of g31-772 investigator.
Configuration of top to flask is such that more sophisticated apparatus can be added as required by the specific test being conducted. Active view current version of standard.
Determination of Metal Corrosion Rate by ASTM G Canadian Laboratory – LCS Laboratory Inc.
Significance and Use 3. Using the above units for T, A, W, and D, the corrosion rate can be calculated in a variety of units with the following appropriate value of K: This statement must be qualified by stating that corrosion should not proceed to the point where the original specimen size or the exposed area is drastically reduced or where the metal is perforated.
Solvents such as acetone, carbon tetrachloride, and alcohol are used to remove oil, grease, or resin and are usually applied prior to other methods of cleaning. A distinction awtm be made between those occurring adtm the supporting devices concentration cells and those on the surfaces that were freely exposed h31-72 the test solution see Guide G For other degrees of aeration, the solution should be sparaged with air or synthetic mixtures of air or oxygen with an inert gas.
With a thickness of approximately 3 mm 0. This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. There are a number of other special types of phenomena of which one must be aware in the design and interpretation of corrosion tests.
The most common testing periods are 48 to h 2 to 7 days. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Please help us to share our service with your friends.
Please fill this form, we will try to respond as soon as possible. ASTM International takes no position respecting the validity of any satm rights asserted in connection with any item mentioned in this standard. The procedures for determining these values are shown in detail in Test Methods E 8.