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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With borderline conditions, a prolonged test may be needed to permit breakdown of the passive? This statement must be quali? It is the responsibility of the user of this standard to g311 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. With a thickness of approximately 3 mm 0. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
This standard, rather than a standardized procedure, is presented as a guide so that some of the pitfalls of such testing may be avoided. However, the calculations must 3g1 be based on mass loss except in quali? A liquid atmospheric seal is required on the test vessel to prevent further contamination. The total surface area of a circular specimen is given by the following equation: 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.
For other degrees of aeration, the solution should be sparaged with air or synthetic mixtures of air or oxygen with an inert gas. Circular specimens should preferably be cut from sheet and not bar stock, to minimize the exposed end grain.
Generally, if cracking is observed on the coupon, it can be taken as positive indication of susceptibility, whereas failure to effect this phenomenon simply means that it did not occur under the duration and speci? Consequently, tests run for long periods are considerably more realistic than those conducted for short durations. The values given in parentheses are for information only. Therefore, at least duplicate specimens should normally be exposed in each test. The others are used principally as a supplement to remove heavily encrusted corrosion products before scrubbing.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. These factors include specimen preparation, apparatus, test conditions, methods of cleaning specimens, evaluation of results, and calculation and reporting of corrosion rates.
Link to Active This link will always aztm to the current Active version of the standard. This cannot be evaluated by mass loss alone. Cupric ions may also exhibit a passivating effect upon stainless steel coupons exposed at the same time. The choice of a speci? 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 metallic contamination of the stamped area may in? For relatively soft metals such as aluminum, magnesium, and copperscrubbing with abrasive powder is not always needed zstm can mar the surface of the specimen.
If you feel that your comments have not received a fair hearing you should make your views known to the B31 Committee on Standards, at the address shown below. A method of electrolytic cleaning is described in Practice G 1. These factors include specimen preparation, apparatus, test conditions, methods of cleaning specimens, evaluation of results, and calculation and reporting of corrosion rates.
This standard does not purport to address all of the safety concerns, if any, associated with its use. Active view current version of standard. Where required, the exhausted constituents should be added or a fresh solution provided during the course of the test.
This guide also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. This practice also emphasizes the importance of recording all pertinent data and provides a checklist for reporting test data. This resurfacing may cause some surface work hardening, to an extent which will be determined by the vigor of the surfacing operation, but is not ordinarily signi?
If clad alloys are exposed, special procedures will be required to ensure that only the cladding is exposed, unless the purpose is to test the ability of the cladding to protect cut edges in the test solution. If clad alloy specimens are to be used, special attention must be given to ensure that excessive metal is not removed. Any necessary distortion of the test conditions must be considered when interpreting the results. g331
ASTM G Standard Practice for Laboratory Immersion Corrosion Testing of Metals_百度文库
In many such cases, corrosion rates are established by mass gain rather than mass loss. The corrosion rate can be calculated from the concentration of the matrix metal found in the solution and it can be compared to that determined from the mass loss of the specimens.
Care should be used to avoid the removal of sound metal. Warning—In many cases the corrosion product on the reactive metals titanium and zirconium is a hard and tightly bonded oxide that de? Close attention and a more sophisticated evaluation than a simple mass loss measurement are required to detect this phenomenon.
The reporting of nonuniform v31 is discussed below. However, there are cases where this assumption is not valid. Scrubbing with a bristle brush and mild abrasive is the most popular of these methods. Oxygen saturation is a function of the partial pressure of oxygen in the gas.
Historical Version s – view previous versions of standard. It should be used as a reference to ensure that the test will allow generation of data relevant to the application with the minimum of interferences.
Special coupons for example, sections of welded tubing may be employed for speci? For proper interpretation of the results obtained, the speci?
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Current edition approved May 1, In special cases for example, for aluminum and certain copper alloysa minimum of 24 h storage in a desiccator is aetm. Duplicate strips of low-carbon steel, each 19 by 76 mm 3?