1、Designation: G131 96 (Reapproved 2016)1Standard Practice forCleaning of Materials and Components by UltrasonicTechniques1This standard is issued under the fixed designation G131; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEEditorial corrections were made throughout in May 2017.1. Scope1.1 This practice covers a procedure for the cleaning
3、ofmaterials and components used in systems requiring a highlevel of cleanliness, such as oxygen, by ultrasonic techniques.1.2 This practice may be used for cleaning small parts,components, softgoods, etc.1.3 The values stated in SI units are standard.1.4 This standard does not purport to address all
4、 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. Specific precau-tionary statements are given in Note 1.1.5 This
5、 international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (
6、TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE1235 Test Method for Gravimetric Determination of Non-volatile Residue (NVR) in Environmentally ControlledAreas for SpacecraftF311 Practice for Processing Aerospace Liquid Samples forParticulate Contamina
7、tion Analysis Using Membrane Fil-tersF324 Test Method for Nonvolatile Residue of VolatileCleaning Solvents Using the Solvent Purity Meter (With-drawn 1987)3F331 Test Method for Nonvolatile Residue of Solvent Ex-tract from Aerospace Components (Using Flash Evapora-tor)G121 Practice for Preparation of
8、 Contaminated Test Cou-pons for the Evaluation of Cleaning AgentsG122 Test Method for Evaluating the Effectiveness ofCleaning Agents3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 contaminant (contamination), nunwanted molecularand particulate matter that could affect or degra
9、de the perfor-mance of the components upon which they reside.3.1.2 contaminate, va process of applying a contaminant.3.1.3 control coupon (witness coupon), na coupon madefrom the same material and prepared in exactly the same wayas the test coupons, which is used to verify the validity of themethod
10、or part thereof.3.1.3.1 DiscussionIn this practice, the control coupon willbe contaminated in the same manner as the test coupons andwill be subjected to the identical cleaning procedure.3.1.4 degas, vthe process of removing gases from a liquid.3.1.5 nonvolatile residue (NVR), nresidual molecular an
11、dparticulate matter remaining following the filtration and con-trolled evaporation of a solvent containing contaminants.3.1.6 particle (particulate contaminant), na piece of mat-ter in a solid state with observable length, width, and thickness.3.1.6.1 DiscussionThe size of a particle is usually defi
12、nedby its greatest dimension and is specified in micrometres.4. Summary of Practice4.1 A part, material or component is placed in a containercontaining the cleaning agent. This container is then placed inan ultrasonic cleaner and treated for a given period of time at1This practice is under the juris
13、diction of ASTM Committee G04 on Compat-ibility and Sensitivity of Materials in Oxygen Enriched Atmospheres and is thedirect responsibility of Subcommittee G04.02 on Recommended Practices.Current edition approved May 1, 2016. Published June 2016. Originallyapproved in 1995. Last previous edition app
14、roved in 2008 as G131 96 (2008).DOI: 10.1520/G0131-96R16E01.2For 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.3
15、The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on st
16、andardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1the recommended temperature for the cleaning agent. Thisresults in a solution if the c
17、ontaminant is soluble in the testfluid or a emulsion if the contaminant is not soluble in the testfluid. The cleaning solution combined with the rinse solutionsmay then be analyzed for particulate, NVR, or total carbon(TC).4.1.1 In the case of aqueous-based agents, the parts arerinsed after the remo
18、val from the cleaning bath and ultrasoni-cally cleaned in reagent water to provide a solution for TCanalysis using G TC.4.1.2 In the case of solvent-based agents, the parts are rinsedwith fresh solvent, which is collected and combined with thesolvent used in the cleaning process, and the NVR determi
19、nedusing Test Method E1235, Test Method F324, or Test MethodF331, as appropriate.4.1.3 Particulate analyses may be performed by filtering thefinal cleaning solution. The particles captured by the filter arethen counted using Practice F311.5. Significance and Use5.1 This practice is suitable for the
20、removal of contaminantsfound on materials, parts, and components used in systemsrequiring a high level of cleanliness, such as oxygen. Partsshall have been precleaned to remove visible contaminantsprior to using this procedure. Softgoods such as seals and valveseats may be cleaned without precleanin
21、g.5.2 This procedure may also be used as the cleanlinessverification technique for coupons used during cleaning effec-tiveness tests as in Test Method G122.5.3 The cleaning efficiency has been shown to vary with thefrequency and power density of the ultrasonic unit. Lowfrequencies in the 20 to 25 ki
22、lohertz range have been found todamage soft metals such as aluminum and silver.Therefore, thespecifications of the unit and the frequencies available must beconsidered in order to optimize the cleaning conditions withoutdamaging the parts.6. Apparatus6.1 Ultrasonic Cleaner, with an operating frequen
23、cy rangebetween 25 and 90 kHz, a typical power range between 10 and25 W/L, and a temperature-controlled bath capable of main-taining a temperature between ambient and 70C with anaccuracy of 2C.6.2 Parts Pans, stainless steel container with volumesbetween 1 and 4 L.6.3 Bracket, stainless steel device
24、 capable of supporting theparts pans in the ultrasonic bath.NOTE 1The bracket should be designed to hang in the ultrasonic bathwithout contact with the bottom.7. Reagents7.1 Solvents such as the following may be used: tetrachlo-roethylene (perchloroethylene), trichloroethylene, methylenechloride, an
25、d perfluorinated carbon fluids.NOTE 2Warning: Solvents such as tetrachloroethylene(perchloroethylene), trichloroethylene, and methylene chloride have rela-tive low threshold limit values and the user should refer to appropriate safehandling procedures, particularly in open tanks. Many solvents are n
26、otconsidered to be compatible with oxygen and must be completelyremoved from cleaned components prior to the use of these componentsin oxygen systems. The preferred method of removal shall be determinedby the user.7.2 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherw
27、ise indicated, it is intended thatall reagents conform to the specifications of the Committee onAnalytical Reagents of the American Chemical Society wheresuch specifications are available.4Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to per
28、mit its use without lessening the accuracy ofthe determination. Detergents used shall be identified bymanufacturer and name (registered trademark, if any).7.3 Purity of WaterThe water used shall meet the require-ments of Specification D1193, Type II.8. Procedure8.1 Sample Preparation:8.1.1 If cleanl
29、iness verification is to be performed on controlor test coupons, prepare the coupons in accordance withPractice G121.8.1.2 If cleanliness verification is to be performed on smallparts, measure the total surface area (S) in square centimetresor the mass in grams, or both, as applicable, to the neares
30、t tenthof a milligram (M1). Record the surface area (S) and mass(M1).8.2 Preliminary Procedure:8.2.1 If a cleaning agent is being used that requires dilutionor special preparation, carefully follow the manufacturersinstructions. Use Type II water to prepare the aqueous cleaningagent solutions or as
31、the actual cleaning agent.NOTE 3It has been found that many common hydrocarbon basedlubricants are effectively removed to acceptable levels using Type II waterat 50 to 55 C. Contaminants more difficult to remove, such as fluorinatedor silicone based lubricants, have typically been found to require t
32、he useof surface active agents. Use Test Method G122 to evaluate the cleaningeffectiveness of the proposed cleaning agent.8.2.2 Fill the ultrasonic bath to the level specified by themanufacturer with water. Place the support bracket in theultrasonic bath, heat the ultrasonic bath to the desiredtempe
33、rature, and degas the water for 10 min.8.2.3 Clean the stainless steel sample parts pan to be used.Conduct the sampling procedure using the selected cleaningagent without parts to verify the cleanliness of the parts pan.Use the same sampling and analysis procedures that will beused on the actual par
34、ts. Determine the contamination level ofthe parts pan, the blank value (B), which shall be less than theallowable contamination level for the items being cleaned orextracted. If the contamination level of the parts pan is greaterthan that specified for the parts, reclean the parts pan until theconta
35、mination level is less than the allowable contaminationspecified for the parts.4Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for Labor
36、atoryChemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,MD.G131 96 (2016)128.3 Cleaning Procedure:8.3.1 Place the material or part(s) being cleaned in thestainless steel parts pan.8.3.2 Pour a mea
37、sured amount of the cleaning agent into thestainless steel cleaning pan sufficient to cover the parts. Coverthe parts pan with aluminum foil or a stainless steel lid, placethe parts pan in the bracket in the ultrasonic bath, adjust thewater level in the bath such that it is above the cleaning agentl
38、evel in the parts pan, and allow the cleaning agent and bathtemperature to equilibrate to the desired cleaning temperature.Alternatively, preheat the parts pan and cleaning agent prior tothe placement of the materials or parts into the parts pan. Thencover the parts pan with foil and place into the
39、bracket in thebath and allow the cleaning agent to equilibrate to thetemperature of the bath.8.3.2.1 Cleaning agent to parts surface area ratio shall notexceed 1000 mL/0.1 m2; the preferred ratio is 500 mL/0.1 m2.8.3.3 Clean the parts in the ultrasonic bath for 10 min. If anaqueous detergent or surf
40、actant solution was used for cleaning,thoroughly rinse the parts with Type II water and then performthe ultrasonic procedure with fresh Type II water. Perform thesampling procedure as soon as possible within a maximumtime limit of 120 min after turning off the ultrasonic cleaner.8.4 Sampling Procedu
41、re for Solvent Cleaned Parts:8.4.1 Remove the parts pan from the ultrasonic bath andremove the cover. Swirl the parts pan to mix the solvent.8.4.2 After swirling, quickly decant the solvent from theparts pan.8.4.3 Wash the parts pan and parts with 500 mL of freshsolvent in three roughly equal portio
42、ns and combine with thesolvent decanted from 8.4.2. Determine the particulate con-tamination analysis using Practice F311. Use the filtrate fromthe particulate analysis as the sample for NVR analysis.8.4.4 Determine and record the mass (M2) of the nonvolatileresidue in milligrams to the nearest tent
43、h of a milligram usingTest Method E1235, Test Methods F324,orF331. Ensure thatthe reported NVR is adjusted to subtract the NVR of anequivalent volume of “blank” solvent.8.5 Sampling Procedure for Aqueous Cleaned Materialsand Parts8.5.1 Remove the parts pan from the ultrasonic bath andremove the cove
44、r. Swirl the parts pan to mix the Type II water.8.5.2 After swirling, quickly decant the Type II water fromthe parts pan.8.5.3 Wash the parts pan and parts with 500 mL of Type IIwater in three roughly equal portions and combine with theType II water from 8.5.2.8.5.4 Use the combined volumes of water
45、 from 8.5.3 todetermine the TC of the sample using G TC.9. Report9.1 Report the following information:9.1.1 Identification of the part or material being cleaned(including tradename, part number, serial number, properchemical name,ASTM designation, lot number, batch number,and manufacturer),9.1.2 Cle
46、aning reagent;9.1.3 Cleaning time;9.1.4 Cleaning temperature;9.1.5 Frequency of the ultrasonic bath, kHz;9.1.6 Power density of the ultrasonic cleaner, W/L;9.1.7 Volume of cleaning reagent used;9.1.8 Mass (M1) of parts cleaned, g;9.1.9 Surface area, cm2; and9.1.10 Mass (M2) of thr NVR, g.10. Keyword
47、s10.1 cleaning; contamination; contaminant; nonvolatileresidue; NVR; oxygen systems; TC; total carbon; ultrasoniccleaningAPPENDIX(Nonmandatory Information)X1. SELECTION OF ULTRASONIC BATHSX1.1 IntroductionThis appendix describes technical in-formation useful in the selection of ultrasonic baths fora
48、queous extraction and cleaning applications. The followinginformation was graciously provided by Blackstone Ultrason-ics5and is reprinted here with their permission.X1.2 Designing an immersible ultrasonic transducer systemrequires that several factors be taken into account. Each case isunique. The f
49、ollowing list will give the reader some idea of theparameters that should be defined. Later, each will be consid-ered as to its effect on the design of the system.X1.2.1 The Tank:X1.2.1.1 Volumecubic measure or gallons.X1.2.1.2 Shapelength, width and depth.X1.2.1.3 Internal Featuresheaters, agitators, linings, sub-mersible pumps, etc.X1.2.1.4 Cleaning Zoneparts placement and racking.X1.2.2 The Parts Being Cleaned:X1.2.2.1 Sizephysical dimensions.X1.2.2.2 Weightweight/density.X1.2.2.3 Number Per Load or Per Unit of Timeparts perrack or basket, parts per h
