ASTM G35-1998(2004) Standard Practice for Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress-Corrosion Cracking in Polythionic Aci.pdf
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1、Designation: G 35 98 (Reapproved 2004)Standard Practice forDetermining the Susceptibility of Stainless Steels andRelated Nickel-Chromium-Iron Alloys to Stress-CorrosionCracking in Polythionic Acids1This standard is issued under the fixed designation G 35; the number immediately following the designa
2、tion indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice describes procedur
3、es for preparing andconducting the polythionic acid test at room temperature, 22 to25C (72 to 77F), to determine the relative susceptibility ofstainless steels or other related materials (nickel-chromiumironalloys) to intergranular stress corrosion cracking.1.2 This practice can be used to evaluate
4、stainless steels orother materials in the “as received” condition or after beingsubjected to high-temperature service, 482 to 815C (900 to1500F), for prolonged periods of time.1.3 This practice can be applied to wrought products,castings, and weld metal of stainless steels or other relatedmaterials
5、to be used in environments containing sulfur orsulfides. Other materials capable of being sensitized can alsobe tested in accordance with this test.1.4 This practice may be used with a variety of stresscorrosion test specimens, surface finishes, and methods ofapplying stress.1.5 This standard does n
6、ot purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For more specificprecautionary stateme
7、nts, see Section 7.2. Referenced Documents2.1 ASTM Standards:2D 1193 Specification for Reagent WaterG 1 Practice for Preparing, Cleaning, and Evaluating Cor-rosion Test SpecimensG 15 Terminology Relating to Corrosion and CorrosionTestingG 30 Practice for Making and Using U-Bend Stress-Corrosion Test
8、 Specimens3. Summary of Practice3.1 The stressed specimens are placed in the container alongwith a sensitized and stressed AISI Type 302 (UNS S30200) orType 304 (UNS S30400) stainless steel control specimen. Asufficient amount of the previously prepared polythionic acidsolution is added to the conta
9、iner to immerse the test speci-mens. A cover is placed on the container and the test is carriedout at room temperature.4. Significance and Use4.1 This environment provides a way of evaluating theresistance of stainless steels and related alloys to intergranularstress corrosion cracking. Failure is a
10、ccelerated by the presenceof increasing amounts of intergranular precipitate. Results forthe polythionic acid test have not been correlated exactly withthose of intergranular corrosion tests. Also, this test may not berelevant to stress corrosion cracking in chlorides or causticenvironments.4.2 The
11、polythionic acid environment may produce areas ofshallow intergranular attack in addition to the more localizedand deeper cracking mode of attack. Examination of failedspecimens is necessary to confirm that failure occurred bycracking rather than mechanical failure of reduced sections.5. Apparatus5.
12、1 Any suitable glass or other transparent, inert containercan be used to contain the acid solution and stressed specimensduring the period of test at room temperature, 22 to 25C (72to 77F). The container should be fitted with a removable topto reduce evaporation and to allow access to the stressedsp
13、ecimen (or specimens) for the periodic inspection.6. Reagents6.1 Purity of ReagentsThe polythionic acid solution shallbe prepared using reagent grade sulfurous acid and technicalgrade hydrogen sulfide; or, distilled water, commercial gradesulfur dioxide, and technical grade hydrogen sulfide.1This pr
14、actice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals, and is the direct responsibility of Subcommittee G01.06 on Environmen-tally Assisted Cracking.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1988. Last previous edition approved in 1998 as
15、G 35 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive,
16、 PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Purity of WaterReagent water Type IV (SpecificationD 1193) shall be used to prepare the test solutions.6.3 Wackenroders or Polythionic Acid Solution (1)3Aslow current of hydrogen sulfide is passed for an hour througha fritted glass tu
17、be into a flask containing chilled (0C, 32F)6 % sulfurous acid, after which the liquid is kept in thestoppered flask for 48 h at room temperature. This operation isrepeated until the liquid no longer gives off the odor of sulfurdioxide after standing at room temperature for a few hours.Note safety p
18、recautions in Section 7.6.3.1 In an alternative method (2), the polythionic acidsolution is prepared by passing a slow current of sulfur dioxidegas through a fritted glass bubbler submerged in a container ofdistilled water. This is continued until the solution becomessaturated and then the hydrogen
19、sulfide gas is slowly bubbledinto the sulfurous acid solution.6.3.2 The presence of polythionic acids in the solutionprepared in accordance with 6.3 or 6.3.1 can be checked byeither of the following methods. Polarography (3) can beemployed to identify the thionic acids, or the percent of acidpresent
20、 in the solution can be determined by wet techniques(4). The simplest method of checking the solution for poly-thionic acids is to expose a stressed and sensitized sample ofAISI Type 302 stainless steel. The sample should fail bycracking in less than 1 h. Alternatively, Type 304 sheet (0.07%carbon)
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