ASTM G87-2002(2013) Standard Practice for Conducting Moist SO2 Tests《执行潮湿二氧化硫试验的标准实施规程》.pdf
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1、Designation: G87 02 (Reapproved 2013)Standard Practice forConducting Moist SO2Tests1This standard is issued under the fixed designation G87; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision. A number in par
2、entheses indicates the year of last reapproval. A superscriptepsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the apparatus and procedure to beused in conducting qualitative assessment tests in accordancewith the requirements of material
3、 or product specifications bymeans of specimen exposure to condensed moisture containingsulfur dioxide.1.2 The exposure conditions may be varied to suit particularrequirements and this practice includes provisions for use ofdifferent concentrations of sulfur dioxide and for tests eitherrunning conti
4、nuously or in cycles of alternate exposure to thesulfur dioxide containing atmosphere and to the ambientatmosphere.1.3 The variant of the test to be used, the exposure periodrequired, the type of test specimen, and the criteria of failureare not prescribed by this practice. Such details are provided
5、 inappropriate material and product purchase specifications.1.4 The values stated in SI units are to be regarded asstandard. The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety concerns, if any associated with its use. It is therespo
6、nsibility 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 a specificwarning statement, see 4.3.2. Referenced Documents2.1 ASTM Standards:2D714 Test Method for Evaluating Degree of Blisteri
7、ng ofPaintsD1193 Specification for Reagent WaterD1654 Test Method for Evaluation of Painted or CoatedSpecimens Subjected to Corrosive EnvironmentsG1 Practice for Preparing, Cleaning, and Evaluating Corro-sion Test SpecimensG46 Guide for Examination and Evaluation of Pitting Cor-rosion3. Significance
8、 and Use3.1 Moist air containing sulfur dioxide quickly produceseasily visible corrosion on many metals in a form resemblingthat occurring in industrial environments. It is therefore a testmedium well suited to detect pores or other sources ofweakness in protective coatings and deficiencies in corro
9、sionresistance associated with unsuitable alloy composition ortreatments.3.2 The results obtained in the test should not be regarded asa general guide to the corrosion resistance of the testedmaterials in all environments where these materials may beused. Performance of different materials in the te
10、st should onlybe taken as a general guide to the relative corrosion resistanceof these materials in moist SO2service.4. Apparatus4.1 The apparatus required for moist SO2testing consists ofa test chamber having an internal capacity of 300 L (10.6 ft3),a supply of sulfur dioxide with metering device,
11、specimensupports, provisions for heating the chamber, and necessarymeans of control. The size and detailed construction of theapparatus are optional, provided the conditions obtained meetthe requirements of this practice. Suitable apparatus which maybe used to obtain these conditions is described in
12、 Appendix X1.4.2 Drops of condensing moisture which accumulate on theceiling of the chamber shall not be permitted to fall on thespecimens being tested.4.3 (WarningSuck-back into cylinder may cause explo-sion. Always use a check valve, vacuum break, or otherprotective apparatus in any line or piping
13、 from cylinder to testchamber to prevent suck-back. Installation of the chamberunder a fume hood is recommended.)5. Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the
14、Commit-tee on Analytical Reagents of the American Chemical Society,1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved May 1, 2013. Published July 2013. Orig
15、inally approvedin 1997. Last previous edition approved in 2007 as G87-02 (2007). DOI:10.1520/G0087-02R13.2For 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 standar
16、ds Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1where such specifications are available.3Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high pur
17、ity to permit its use without lessening theaccuracy of the determination.5.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean reagent water as definedby Type IV of Specification D1193.5.3 A commercially available source of bottled SO2gashaving a minimum purit
18、y of 99.9 % (liquid phase) with properregulator, and means of measuring the volumes of gas requiredfor delivery into test chamber shall be provided.5.4 The volume of gas delivered into test chamber shall bemeasured by means of either a properly calibrated flowmeter(rotameter type) with metering valv
19、e, or in a gas buret usingviscous paraffin oil as the pressure controlling fluid.5.4.1 The volume to be measured may be as small as 0.2 L.Measures should be taken to avoid errors from air contained indelivery tubes between flowmeter or gas burette and testchamber.6. Sampling6.1 The specific location
20、 of samples in a mill product, thenumber of samples that should be tested, and other factorsconcerning sampling, are not within the scope of this practice.These factors should be mutually agreed upon between pur-chaser and supplier (see 7.1).7. Test Specimens7.1 Select the number and type of test sp
21、ecimens, and theirshape and dimensions according to the specification coveringthe product or material being tested or agreed upon betweenpurchaser and supplier.7.2 The total combined exposed surface area of the materialtested at any one time should be substantially the same andunless otherwise agree
22、d upon, it shall be 0.5 6 0.1 m2(5.4 ft26 1ft2).7.2.1 More specimens of the same material may be added, ifneeded.7.3 To obtain quantitative corrosion-rate data, only materi-als with similar reactivities should be included in a test run.7.4 Preparation of Test Specimens:7.4.1 Suitably clean the speci
23、mens before testing (see Prac-tice G1). Unless otherwise agreed upon the cleaning methodshall be optional depending on the nature of the surface and ofthe likelihood of contamination. The cleaning method shall notinclude the use of abrasives (other than a paste of puremagnesium oxide), corrosive sol
24、vents, corrosion-promotingmaterials or protective film formers. Care in handling isnecessary so as not to recontaminate the test specimens.7.4.2 If test specimens are cut from a larger coated article,carry out the cutting in such a way that coating damage isminimized in the area adjacent to the cut.
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