ASTM G31-72 PDF
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 v31-72 metals and alloys are described in Practice G 1. This cannot be evaluated by mass loss alone. 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.
ASTM G_Laboratory Immersion Corrosion Testing of Metals – Free Download PDF
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. The behavior of the specimens in this galvanic couple are compared with that of insulated specimens exposed on the same holder and the galvanic effects noted.
A liquid atmospheric seal is required on the test vessel to prevent further contamination. The mass loss during the test period can be used as the principal measure of corrosion. Link to Active This link will always route to the current Active version of g3-172 standard. In many such cases, corrosion rates are established by wstm gain rather than mass loss. 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: The reporting of nonuniform corrosion is discussed below.
With a thickness of approximately 3 mm 0. Care should be used to avoid the removal of sound metal.
Determination of Metal Corrosion Rate by ASTM G31-72. Canadian Laboratory
We are a non-profit group that run this website to share documents. Thank you for interesting in our services. After final preparation of the axtm surface, the specimens should be stored in a desiccator until exposure, if they are not used immediately. These ratios can be achieved through the use of square or circular specimens of minimum thickness.
It should be observed, however, that galvanic corrosion can be greatly affected by the area ratios of the respective metals, the distance between the metals and the resistivity of the electrolyte. Too much surface preparation may remove segregated elements, surface asrm, and so forth, and therefore not be representative.
Any necessary distortion of the test conditions must be considered when interpreting the results.
If clad alloy specimens are to be used, special attention must be given to ensure that excessive metal is not removed. Link to Active This link will always route to the current Active version of the standard.
Chemicals are chosen for application to a specific material. Originally approved in The density in the constant K cancels out the density in the corrosion rate equation.
Determination of Metal Corrosion Rate by ASTM G Canadian Laboratory – LCS Laboratory Inc.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The most common testing periods are 48 to h 2 to 7 days. These factors include oxygen concentration, temperature, rate of flow, pH value, composition, and other important characteristics of the solution. It should be appreciated that pitting is a g331-72 phenomenon and that the incidence of pitting may be directly related to the area of metal exposed.
ASTM G31-72_Laboratory Immersion Corrosion Testing of Metals
If this is a factor to be considered in a specific test, the solution should be completely aerated or deaerated in accordance with 8. These factors include specimen preparation, apparatus, test conditions, methods of cleaning specimens, evaluation of results, and calculation and reporting of corrosion rates.
If clad alloys are exposed, special procedures will be required to ensure that only the cladding is exposed, unless the purpose axtm to test the ability of the cladding to protect cut edges in the test solution. Current edition approved May 1, Cupric ions may also exhibit a passivating g31–72 upon stainless steel coupons exposed at the same time.
This practice, atm than a standardized procedure, is presented as a guide so that some of the pitfalls of such testing may be avoided. We need your help to maintenance this website.