1、Designation: D2251 10Standard Test Method forMetal Corrosion by Halogenated OrganicSolvents and Their Admixtures1This standard is issued under the fixed designation D2251; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers the evaluati
3、on of the corrosive-ness to metals by halogenated organic solvents and theiradmixtures for cold cleaning applications.NOTE 1The test method described herein is an adaptation of TestMethod D130.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included
4、 in thisstandard.1.3 This standard does not 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 us
5、e.2. Referenced Documents2.1 ASTM Standards:2D130 Test Method for Corrosiveness to Copper from Pe-troleum Products by Copper Strip TestD235 Specification for Mineral Spirits (Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)E2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazar
6、d Precision Liquids3. Summary of Test Method3.1 Polished metal strips are immersed in a given quantityof sample and heated at reflux temperature for 60 min. At theend of this period, the metal strips are removed and examinedfor evidence of corrosion. Similar metal strips are immersed ina given quant
7、ity of sample in closed containers and held atroom temperature for 10 days. At the end of this period, thestrips are removed and examined.4. Significance and Use4.1 These tests are to be used as a guide in selecting oreliminating certain solvents or grades of solvents used forcleaning or degreasing
8、metal parts.5. Apparatus5.1 FlaskErlenmeyer flask, borosilicate glass, 125-mLcapacity, with a 24/40 standard-taper joint.5.2 Reflux CondenserCondenser with a 24/40 standard-taper joint, 650 mm in length.5.3 BathOil or water bath, for maintaining a temperatureslightly higher than the initial boiling
9、point of the sample. Asupport shall be provided to hold the flask upright.5.4 ThermometerAn ASTM High Distillation Thermom-eter having a range from 30 to 760F and conforming to therequirements forThermometer 8F or a range from 2 to 400Cconforming to the requirements for Thermometer 8C as pre-scribed
10、 in Specification E2251 or other thermometer of suitabledesign and range.5.5 Test Tubes, 150 mm in length, 19 mm in diameter, withstandard-taper, ground-glass stopped.6. Materials6.1 Metal StripsStrips of various metals about12 in. (12mm) in width and about 3 in. (76 mm) in length. A suggestedselect
11、ion of metals includes copper, brass, aluminum, steel, andgalvanized iron. Other metals likely to be encountered mayalso be used for this test.6.2 Polishing MaterialsSilicon carbide or alumina-gritpaper of varying degrees of fineness including 240-grit siliconcarbide paper or cloth; also a supply of
12、 150-mesh siliconcarbide grain and pharmaceutical-grade absorbent cotton.6.3 Cleaning SolventNoncorrosive mineral spirits, suchas Specification D235 on hydrocarbon dry cleaning solvent.1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguis
13、hing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Feb. 1, 2010. Published February 2010. Originallyapproved in 1964 as D2251 64 T. Last previous edition approved in 2004 asD2251 96(2004). DOI: 10.1520/D2251-10.2For referenced ASTM standards,
14、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, PO Box C700, West Conshohocken, PA 1942
15、8-2959, United States.7. Preparation of Test Strips7.1 Surface PreparationRemove all surface blemishesfrom both sides of the strip with silicon carbide or alumina-gritpaper of such degree of fineness as needed to accomplish thedesired results efficiently. Finish with 240-grit silicon carbidepaper, r
16、emoving all marks that may have been made by othergrades of paper used previously. Immerse the strip in noncor-rosive mineral spirits, from which it may be withdrawnimmediately for final polishing, or in which it may be storedfor future use.7.2 Final PolishingRemove a strip from the noncorrosivemine
17、ral spirits. Handle only with stainless steel forceps; do nottouch with the fingers. Polish the main surfaces with siliconcarbide grains on absorbent cotton. Rub in the direction of thelong axis of the strip, carrying the stroke beyond the end of thestrip before reversing the direction. Clean all me
18、tal dust fromthe strip by rubbing vigorously with clean pads of absorbentcotton until a fresh pad remains unsoiled. When the strip isclean, immediately immerse it in the prepared sample.8. Procedure8.1 Place the polished metal strip in a clean Erlenmeyerflask. Add sufficient sample to be tested to c
19、over the stripcompletely.Add boiling beads, insert the reflux condenser, andheat the contents of the flask rapidly to boiling by immersingthe flask in an oil or water bath at a temperature just highenough to cause gentle boiling. Keep the sample refluxing for60 min.8.2 Examination of StripImmediatel
20、y withdraw the stripwith stainless steel forceps; blot dry with quantitative filterpaper; inspect for evidences of tarnish or corrosion by com-parison with a similarly polished but untested strip.8.3 Place a polished metal strip in a clean test tube. Addsufficient sample to cover the strip completel
21、y. Stopper the tubeand allow to stand at room temperature for 10 days.8.4 Examination of StripAt the end of the 10-day period,withdraw the strip with stainless steel forceps; blot dry withquantitative filter paper, and inspect for evidences of tarnish orcorrosion by comparison with a similarly polis
22、hed but untestedstrip.9. Report9.1 When only one metal is to be in contact with the solvent,compare the effect of various solvents on the metal, and list thesolvents in order of merit, or as acceptable and not acceptable,according to the requirements of the purchasing specification.9.2 When a number
23、 of different metals are to be in contactwith the solvent, prepare a separate list or grouping for eachmetal involved, and add a statement to the effect that one ormore solvents are or are not acceptable for all the metalsinvolved.10. Precision and Bias10.1 Only visual observations required. It is n
24、ot possible todetermine a precision and bias statement.11. Keywords11.1 aluminum; brass; copper; corrosion; galvanized iron;halogenated solvents; metal corrosion; mild steel; reflux test;ten-day storage test; visual observationASTM International takes no position respecting the validity of any paten
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26、t any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your commen
27、ts will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted
28、by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D2251 102
