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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Therefore, at least duplicate specimens should normally be exposed in each test.
With a thickness of approximately 3 mm 0. Cupric ions may also exhibit a passivating effect upon stainless steel coupons exposed at the same time. This statement must be quali? For example, the accumulation of cupric ions in the testing of copper alloys in intermediate strengths of sulfuric acid will accelerate the corrosion of copper alloys, as compared to the rates that would be obtained if the corrosion products were continually removed.
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ASTM G Standard Practice for Laboratory Immersion Corrosion Testing of Metals_百度文库
Therefore, short tests on such materials would indicate a high corrosion rate and be completely misleading. For other degrees of aeration, the solution should be sparaged with air or synthetic mixtures of air or oxygen with an inert gas.
These factors include oxygen concentration, temperature, rate of? This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. The total surface area 3g1 a circular specimen is given by the following equation: This standard does not purport to address all of the safety concerns, if any, associated with its use.
Masking may also be used to achieve the desired area ratios but may cause crevice corrosion problems. Current edition approved May 1, Scrubbing with a bristle brush and mild abrasive is the most popular of these methods.
Atsm can be accomplished by analysis of the solution after corrosion has occurred. In many such cases, corrosion rates are established by mass gain rather than mass loss.
The values given in parentheses are for information only. The mechanical property commonly used for comparison is the tensile strength.
These factors include apparatus, sampling, test specimen, test conditions test asfm composition, temperature, gas sparging, fluid motion, solution volume, method of supporting test specimens, duration of testmethods of cleaning test specimens, interpretation of results, and calculation of corrosion rates.
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: 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.
If clad alloys are exposed, special procedures will be required to ensure that only b31 cladding is exposed, unless qstm purpose is to test the ability of the cladding to protect cut edges in the test solution. It is necessary to evaluate this localized corrosion separately from the overall mass loss.
Any necessary distortion of the test conditions must be considered when interpreting the results. This can be done by chemical treatment picklingelectrolytic removal, or by grinding with a coarse abrasive paper or cloth such as No.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The degree of lateral spreading of pits may also be noted. A large surface-to-mass ratio and a small ratio of edge area to total area are desirable. In many such cases, corrosion rates are established by mass gain rather than mass loss. It may be desirable to test a surface representative of the material and metallurgical conditions used in practice. 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.
Measurement of percent elongation is a useful index of embrittlement. A metallographic examination may con? If agitation is required, the apparatus can be modi?