1 These test methods are under the jurisdiction of ASTM Committee G01 on. Corrosion Results for ASTM G48 Standard Test Method for Pitting and Crevice. Pitting and Crevice Corrosion Resistance of Stainless. tion of the resistance of stainless steels and related alloys to bility of regulatory limitations prior to use. pitting and crevice corrosion resistance. Designation: G 48 – 03 (Reapproved ) Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Related Alloys by Use .
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G() Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels Format, Pages, Price. PDF ASTM License Agreement. G48 - Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steels and Format, Pages, Price. PDF ASTM License Agreement. ASTM G() - Designation: G 48 – 03 (Reapproved ) Standard Test Methods for Pitting.
Methods A and B are designed to cause the breakdown of Type at room temperature. No statement can be made about resistance of alloys in environments that do not contain chlorides. Consequently, the degree of corrosion damage that occurs during testing will generally be greater than that in natural environments in any similar time period.
Therefore, grinding and pickling of the specimen will mean that the results may not be representative of the conditions of the actual piece from which the sample was taken. NOTE 1—Grinding or pickling on stainless steel surfaces may destroy the passive layer. A h air passivation after grinding or pickling is sufficient to minimize these differences 8.
These include the cold? Straight end condensers can be inserted through a bored rubber stopper. Likewise, a simple U tube condenser can be fashioned. NOTE 2—The use of ground joint condensers requires that the mouth of the? NOTE 3—Venting must always be considered due to the possible build up of gas pressure that may result from the corrosion process. However, placement of the specimen does create the possible opportunity for crevice corrosion to occur along the edge.
NOTE 4—See Apparatus 5. Condensers are required for elevated temperature testing when solution evaporation may occur. Glass cradles or hooks also may be required. Tall form or Erlenmeyer?
The mouth of the? If testing requires use of a condenser described below , the test tube 5. Cradles, such as those shown in Fig. While the use of hooks requires that a specimen support hole be provided, the hooks, as contrasted to the cradle, are easier to fashion.
Moreover, they create only one potential crevice site whereas multiple sites are possible with the cradle. Each block shall be Blocks can be machined from bar or rod stock. G 48 — 03 FIG. Rubber bands shall be one No. NOTE 7—Rubber bands or O-rings can be boiled in water prior to use to ensure the removal of water-soluble ingredients that might affect corrosion.
The crevice design shown in Fig. Before reuse, each washer should be inspected for evidence of distortion and other damage. If so affected, they should be discarded. In some cases, the crevice formers may become stained with corrosion products from the tested alloy.
Each assembly comprises a threaded bolt and nut plus two washers. The bolt length shall be sized to allow passage through the mouth of the glassware described in 5.
Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend. Ferric Chloride Test Solution 6. Filter through glass wool or? Test Specimens 7.
All specimens in a test series should have the same dimensions when comparisons are to be made. Unless end-grain pitting is an integral part of the evaluation, the proportion of end-grain surface to specimen surface should be kept as small as possible given the limitations of specimen sizes because of the susceptibility of end-grain surfaces to pitting.
Transfer the test beaker to a constant temperature bath and allow the test solution to come to the equilibrium temperature of interest. Maintain test solution temperature throughout the test. A reasonable test period is 72 h, although variations may be used at the discretion of the investigator and depend on the materials being evaluated. Ultrasonic cleaning may be used as a substitute method in cases in which it is difficult to remove corrosion products from deep pits.
Use plastic gloves to avoid hand contact with metal surfaces during this operation. Use the small O-ring or the No. It is good practice to remove deformed edges to the thickness of the material. Agrit abrasive paper has been found to provide a satisfactory standard?
Wet polishing is preferred, but if dry polishing is used, it should be done slowly to avoid overheating.
The sharp edges of a specimen should be rounded to avoid cutting rubber bands or O-rings. NOTE 10—While a polished surface is preferred for uniformity, the test may be varied at the discretion of the investigator to evaluate other surface? Specimens may be inspected at intervals by decanting the test solution into a clean beaker and sliding the specimen from the test tube. Rinse the specimen in water and examine under the four points of contact for the O-rings or rubber bands and under both TFE-?
If further exposure is required, the specimen and solution should be returned to the test tube before the specimen drys and the test tube should be immediately returned to the bath. NOTE 11—The removal of specimens for inspection may affect the rate of corrosion, and caution should be observed when comparing these results with those obtained from constant immersion tests. No more than one specimen shall be placed in a test container.
Replace the watch glass on the container. The standard test period is 72 h.
This test period was evaluated by interlaboratory testing, The test period must be reported as indicated in NOTE 13—Critical pitting or crevice testing is likely to require three to?
Ultrasonic cleaning may be used in those cases in which it is difficult to remove corrosion products from deep pits or crevices. Pitting corrosion is considered to be present if the local attack is 0. Cover the container with a watch glass, transfer to a constant temperature bath, and allow to come to the equilibrium temperature of interest. Verify the temperature before starting the test. The starting temperature may be estimated by the following equation 11, A TFE-?
Insulating sleeves shall be used around the bolt and the specimen shall be checked for electrical contact with the bolt. The torque on the bolt in? A torque of 0. The torque must be reported as indicated in NOTE 16—The torque of 0.
NOTE 17— a Titanium bolts, nuts, and? Edge attack ignored. Cover the container with a watch glass, transfer to a constant temperature bath, and allow to come to equilibrium temperature of interest.
The starting temperature may be estimated for nickel base alloys by the following equation Crevice corrosion is considered to be present if the local attack is 0. The starting temperature may be estimated by the following Eq. See Notes 13 and 14 of The standard test period is 24 h. A torque of 1. NOTE 20—The torque of 1. See Notes 13 and Examination and Evaluation Drawing and Drafting. Telecommunications Standards. AWS D1. Structural Welding. The Store A2LA: Addison-Wesley Publishing Co.
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