1、Designation: D 2251 96 (Reapproved 2004)Standard Test Method forMetal Corrosion by Halogenated OrganicSolvents and Their Admixtures1This standard is issued under the fixed designation D 2251; the number immediately following the designation indicates the year oforiginal adoption or, in the case of r
2、evision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 metho
3、d covers the evaluation 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 D 130.1.2 This standard does not purport to address all of thesafety concerns, if any, asso
4、ciated 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.2. Referenced Documents2.1 ASTM Standards:2D 130 Test Method for Detection of Copper Corrosion fromP
5、etroleum Products by the Copper Strip Tarnish TestD 235 Specification for Mineral Spirits (Petroleum Spirits)(Hydrocarbon Dry Cleaning Solvent)E1 Specification for ASTM Thermometers3. Summary of Test Method3.1 Polished metal strips are immersed in a given quantityof sample and heated at reflux tempe
6、rature 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 quantity of sample in closed containers and held atroom temperature for 10 days. At the end of this period, thestrips are removed and examined.
7、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 metal parts.5. Apparatus5.1 FlaskErlenmeyer flask, borosilicate glass, 125-mLcapacity, with a 24/40 standard-taper joint.5.2 Reflux Conden
8、serCondenser 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 point of the sample. Asupport shall be provided to hold the flask upright.5.4 ThermometerAn ASTM High Distillation Thermom-eter having a r
9、ange 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 in Specification E1or other thermometer of suitabledesign and range.5.5 Test Tubes, 150 mm in length, 19 mm in diameter, withstandard-tap
10、er, 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 suggestedselection of metals includes copper, brass, aluminum, steel, andgalvanized iron. Other metals likely to be encountered mayalso be used for this test
11、.6.2 Polishing MaterialsSilicon carbide or alumina-gritpaper of varying degrees of fineness including 240-grit siliconcarbide paper or cloth; also a supply of 150-mesh siliconcarbide grain and pharmaceutical-grade absorbent cotton.6.3 Cleaning SolventNoncorrosive mineral spirits, suchas Specificatio
12、n D 235 on hydrocarbon dry cleaning solvent.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 the1This test method is under the jurisdiction of ASTM
13、 Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Dec. 1, 2004. Published December 2004. Originallyapproved in 1964 as D 2251 64 T. Last previous edition approved in 2000 asD 225
14、1 96(2000).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 Dri
15、ve, PO Box C700, West Conshohocken, PA 19428-2959, United States.desired results efficiently. Finish with 240-grit silicon carbidepaper, removing 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 withdr
16、awnimmediately for final polishing, or in which it may be storedfor future use.7.2 Final PolishingRemove a strip from the noncorrosivemineral spirits. Handle only with stainless steel forceps; do nottouch with the fingers. Polish the main surfaces with siliconcarbide grains on absorbent cotton. Rub
17、in the direction of thelong axis of the strip, carrying the stroke beyond the end of thestrip before reversing the direction. Clean all metal dust fromthe strip by rubbing vigorously with clean pads of absorbentcotton until a fresh pad remains unsoiled. When the strip isclean, immediately immerse it
18、 in the prepared sample.8. Procedure8.1 Place the polished metal strip in a clean Erlenmeyerflask. Add sufficient sample to be tested to cover 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 w
19、ater bath at a temperature just highenough to cause gentle boiling. Keep the sample refluxing for60 min.8.2 Examination of StripImmediately withdraw the stripwith stainless steel forceps; blot dry with quantitative filterpaper; inspect for evidences of tarnish or corrosion by com-parison with a simi
20、larly polished but untested strip.8.3 Place a polished metal strip in a clean test tube. Addsufficient sample to cover the strip completely. 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 st
21、eel forceps; blot dry withquantitative filter paper, and inspect for evidences of tarnish orcorrosion by comparison with a similarly polished 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 thesolve
22、nts in order of merit, or as acceptable and not acceptable,according to the requirements of the purchasing specification.9.2 When a number 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
23、ormore solvents are or are not acceptable for all the metalsinvolved.10. Precision and Bias10.1 Only visual observations required. It is not possible todetermine a precision and bias statement.11. Keywords11.1 aluminum; brass; copper; corrosion; galvanized iron;halogenated solvents; metal corrosion;
24、 mild steel; reflux test;ten-day storage test; visual observationASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any su
25、ch patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invit
26、ed either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments 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
27、 fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted 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).D 2251 96 (2004)2
